Top 15 Best Quercetin Supplements of 2024: Ultimate FAQ Review Guide

Reviewing the top 15 best quercetin supplements of 2024, plus a research guide on the most popular questions on using this plant-based antioxidant flavonoid to boost immunity and fight free radicals.

Full Disclosure

Quercetin is a flavonoid found in certain plants and foods, including red wine, green tea, and apples.

Today, people prize quercetin for its antioxidant and anti-inflammatory effects. It also might help to improve respiratory function, mitigate allergies, and limit seasonal flus and colds.

According to WebMD, some people even take quercetin daily to reduce inflammation, kill cancer cells, control blood sugar, and help prevent heart disease.

The easiest way to get quercetin is through a supplement. Today, you can buy quercetin supplements through Amazon, CVS, Walmart, and other major retailers. Quercetin supplements provide a strong dose of the flavonoid in a convenient way.

Does quercetin really work? What are the best quercetin supplements to buy in 2024? Today, we’re explaining everything you need to know about quercetin supplements.

Ranking the Top 15 Best Quercetin Supplements in 2024

Here’s how our editorial team ranked the top quercetin supplements of 2024. As usual, these rankings are in no particular order, and our list is certainly not definitive. It should instead serve as a starting point for your own research into quercetin supplements.


Solgar Quercetin Complex

Solgar Quercetin Complex

Solgar’s Quercetin Complex uses Ester-C plus to create a “unique synergistic formula” that provides “natural seasonal support”. Like many other quercetin supplements listed here, Solgar’s Quercetin Complex contains bromelain, which helps boost the absorption of quercetin into the body.

This supplement contains an ingredient we don’t see in many other quercetin formulas on this list: Ester-C Plus, which is a pH neutral, non-acidic, patented form of vitamin C that is gentle on the stomach. Vitamin C and bromelain have been shown to boost absorption of quercetin, which could make this the most bioavailable quercetin supplement on this list.

Rounding out the formula are a citrus bioflavonoid complex, rose hips, and acerola, all of which are plant extracts that seem to have powerful antioxidant or anti-inflammatory effects.

Price: $30 (25 Servings)   

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Now Foods Quercetin with Bromelain

Now Foods Quercetin with Bromelain

Now Foods Quercetin with Bromelain is a popular and well-rated quercetin supplement that claims to support healthy seasonal immune function. The supplement contains just two active ingredients, including 800mg of quercetin and 16mg of bromelain (2400 GDU/g) in each two capsule serving.

Now Foods is a longstanding and well-rated supplement company that sells dozens of popular supplements through Amazon and other retailers. They’re also known for their reasonable prices: each bottle of Now Foods Quercetin with Bromelain contains 240 vegetable capsules (120 servings) at a great price.

Price: $40 (120 Servings)

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Oregon’s Wild Harvest Nettle Quercetin

Oregon’s Wild Harvest Nettle Quercetin

Oregon’s Wild Harvest Nettle Quercetin claims to support your body during allergen exposure. The supplement has no artificial flavors, colors, excipients, or stearates. Like other Oregon’s Wild Harvest supplements, Nettle Quercetin is made in Redmond, Oregon, with all ingredients verified by a third-party independent lab.

Oregon’s Wild Harvest seems cheaper than competing supplements here, although it uses a three capsule serving size (instead of the one or two capsules used in most other formulas), which means there are only 20 servings in each bottle. Nevertheless, it’s a popular and well-rated allergy aid.

Price: $17 (20 Servings)

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Solaray Quercetin 500mg

Solaray Quercetin 500mg

Solaray Quercetin may have the blandest bottle on this list, but it provides a strong dose of quercetin with no added ingredients. Each serving contains 500mg of quercetin. Solaray claims their formula supports healthy cells, the heart, the circulatory system and respiratory system, and more by providing bioflavonoids and antioxidants while activating AMPK.

At $22 for 90 servings (90 capsules), Solaray Quercetin is also one of the best budget quercetin options on our list. It doesn’t have added ingredients like bromelain or vitamin C, but it does provide a strong, no-nonsense dose of quercetin in each capsule.

Price: $22 (90 Capsules)

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Swanson Quercetin

Swanson Quercetin

Swanson Quercetin provides 475mg of quercetin in each capsule, which is similar to other top-rated quercetin supplements on our list. What separates Swanson Quercetin from the competition, however, is its cheap price tag. At just $12 for 60 servings, it’s one of the most affordable quercetin supplements you can find.

Swanson Health is a popular and well-known supplement company that has been making formulas since 1969. Today, Swanson Quercetin is one of the best quercetin options available anywhere.

Price: $13 (60 Servings)

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Eclectic Nettle Quercetin

Eclectic Nettle Quercetin

Eclectic Institute Nettle Quercetin is another quercetin supplement made by a popular, longstanding supplement company. Eclectic Institute isn’t as well-known as Swanson, but they’ve been making products since 1982.

Today, the company’s fresh, freeze-dried nettle quercetin provides 350mg of freeze-dried stinging nettle leaf and 350mg of quercetin dihydrate in each two capsule serving. The non-GMO formula uses US-grown nettles. And, at $18 for 45 servings (90 capsules), Eclectic Nettle Quercetin will not break the bank.

Price: $18 (45 Servings)

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PureNaturals Quercetin Bromelain

PureNaturals Quercetin Bromelain

PureNaturals markets its quercetin bromelain supplement as a powerful antioxidant that helps neutralize free radical damage, provide anti-inflammatory support, and support cardiovascular and immune health.

Bromelain increases the absorption of quercetin into the bloodstream, and PureNaturals claims the two ingredients enhance each other’s anti-oxidant and anti-inflammatory actions. Each two capsule serving contains a very strong dose of quercetin, including 800mg of quercetin and 165mg of bromelain (2,400 GDU/g) per serving. Despite the high dose, PureNaturals Quercetin Bromelain is still very affordable.

Price: $17 (60 Servings)

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BulkSupplements Quercetin Dihydrate Powder

BulkSupplements Quercetin Dihydrate Powder

BulkSupplements has a reputation for offering bulk dosages of pure supplement formulas at a very cheap price. You don’t get a tablet or capsule: you get bulk quercetin powder. You can add the powder to a smoothie, shake, or beverage of your choice. Alternatively, some people create their own capsules or tablets using the formula.

Each standing serving contains 500mg of quercetin dihydrate. There are no other ingredients. Each package has 100 servings (50g) of quercetin dihydrate powder. BulkSupplements also offers 100g and 500g bags with even more formula.

Price: $27 (100 Servings)

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NuPath Labs Ionic Quercetin

NuPath Labs Ionic Quercetin

NuPath Labs Ionic Quercetin is the first supplement on this list so far with a liquid instead of a capsule, tablet, or powder. NuPath Labs has created ionic quercetin, which means the quercetin particles are suspended in a liquid. The company claims this provides superior absorption.

Like other tinctures, you hold NuPath Labs Ionic Quercetin underneath your tongue (sublingually) for maximum absorption into the body. The company claims each sublingual drop is equal to 1,000mg of regular quercetin.

Price: $18 (125 Servings)

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Solaray Mega Quercetin

Solaray Mega Quercetin

This is the second Solaray supplement on our list. If you want an even higher dose of quercetin, then Solaray Mega Quercetin may be the right choice. Solaray Mega Quercetin contains more than double the dose of the ordinary Solaray quercetin supplement. With 1,200mg of quercetin in each two capsule serving, Solaray Mega Quercetin has one of the highest dosages in the industry.

Solaray has also added 40mg of bioflavonoid concentrate, 40mg of hesperidin concentrate, 40mg of rutin concentrate, and 100mg of bromelain to their formula.

Price: $16 (30 Servings)

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Jarrow Formulas Quercetin

Jarrow Formulas Quercetin

Jarrow Formulas quercetin claims to support your cardiovascular system with 500mg of quercetin in each capsule. There are no other listed ingredients: you’re getting pure quercetin and nothing else. There’s a 100 capsule and 200 capsule option available online.

The Jarrow Formulas Quercetin supplement is well-rated on Amazon, where the supplement has an average rating of 4.4 stars out of 5 with 77% of reviews being five stars. By taking Jarrow Formulas Quercetin daily, the company claims you can support antioxidant status and promote cardiovascular health.

Price: $42 (200 Servings)

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Natural Factors Bioactive Quercetin EMIQ

Natural Factors Bioactive Quercetin EMIQ

Natural Factors Bioactive Quercetin EMIQ claims to have 40 times better absorption than ordinary quercetin. Other quercetin supplements here use bromelain to boost bioavailability, but this supplement uses “EMIQ”, a proprietary formula made from “enzymatically modified isoquercitrin”.

There’s a lower dosage of quercetin in each capsule. However, Natural Factors claims the quercetin is more bioavailable, which means your body gets a strong dose regardless. Each capsule contains 167mg of EMIQ and 50mg of vitamin C. Natural Factors claims their formula will provide year-round protection while supporting a healthy inflammatory response and maintaining good sinus and upper respiratory function.

Price: $22 (60 Servings)

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Natrition Quercetin + Grape Skin Extract

Natrition Quercetin + Grape Skin Extract

Natrition’s Quercetin + Grape Skin Extract supplement is an antioxidant extract that comes from fruits and vegetables. It claims to support a healthy immune system with 400mg of quercetin and 360mg of grape skin extract in each serving.

The active ingredients are packaged into a vegetable capsule. Natrition has also added a variety of plant and vegetable extracts to each capsule, including asparagus, beet, cabbage, and carrot, among other vegetables. The formula is much different from anything else on our list, but it may

Price: $25 (60 Servings)

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Life Extension Bio-Quercetin

Life Extension Bio-Quercetin

Life Extension Bio-Quercetin claims to use a highly absorbable form of the compound called quercetin phytosome, which is “up to 50x more bioavailable than typical quercetin”. Life Extension claims their formula can support cellular, vascular, and immune health.

Oddly, Life Extension contains just 29mg of Bio-Quercetin phytosome (providing 10mg of quercetin) per serving. That’s a much smaller dose than any other quercetin supplement on this list. It’s unclear how much more quercetin is absorbed into your body (if any) compared to other quercetin supplements.

Price: $15 (30 Servings)

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Cape Fear Naturals Quercetin

Cape Fear Naturals Quercetin

Cape Fear Naturals makes a quercetin supplement with a lower dose than most other formulas on this list. With 100mg of quercetin in each tablet, Cape Fear Naturals Quercetin claims to support the immune system, boost overall health and wellness, support normal cardiovascular health, and provide other benefits.

The formula has just one listed ingredient: 100mg of quercetin dihydrate. The formula is packaged into a tablet with magnesium stearate and silica. Overall, it’s a low dose of quercetin packaged with fillers and binders, and there’s limited reason to choose Cape Fear Naturals Quercetin over some of the higher-ranked quercetin supplements on our list.

Price: $11 (60 Servings)

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How We Ranked

Quercetin supplements all make similar claims. Many claim to boost the immune system and provide antioxidants, for example. Our editorial team ranked the supplements above based on the following factors:

Quercetin Dosage: You’re taking a quercetin supplement because you want quercetin. Dosage played a big role in our rankings.

Concentration: Not all quercetin is made alike. Some quercetin is more concentrated than others. There are no standardized quercetin measurements, but we considered concentration and dosage in our rankings.

Added Bioavailability: There’s evidence that bromelain and other ingredients boost the bioavailability of quercetin, so we preferred supplements with added bromelain.

Price & Value: Some people want to spend $60 on a quercetin supplement. Others want to spend $10. We featured a range of supplements at different prices.

Label Transparency: Good quercetin supplements have transparent labels with all dosages listed. We avoided quercetin supplements that used proprietary formulas with no listed dosages.

Manufacturer Reputation: Some quercetin supplement companies have been making supplements since the 1960s. Other companies have launched in the last few years to address rising demand. We weren’t biased to older supplement companies, although we did take manufacturer reputation into consideration.

Advertised Health Benefits: Supplements cannot claim to cure or prevent a disease. However, some supplement companies walk a careful line. We avoided quercetin supplements that made unusual health benefit claims.

Delivery Method: Most people would prefer taking one capsule per day instead of three. Some people also prefer a liquid quercetin supplement for sublingual use. We featured a variety of delivery methods for all preferences.

Lab Testing: Most quercetin supplements above have not been tested in labs to verify their effectiveness. However, some quercetin supplements are tested by independent labs to verify potency and purity.

Who Should Take Quercetin?

Who Should Take Quercetin?

People take quercetin for many different reasons.

Quercetin is a popular immune supplement. There’s evidence that quercetin improves your immune system, which means your body is better able to fight off infections.

Many people take quercetin for allergies. Some claim that quercetin prevents allergies, for example, or works similar to an antihistamine. In fact, some people claim quercetin is the only thing that helps their seasonal allergies, pollen allergies, and other allergy symptoms.

Research shows that quercetin stabilizes mast cells that release histamine. Histamine is the principal mediator of reactions to pollen and other allergies. This makes quercetin a natural antihistamine, and there’s evidence it could reduce symptoms of runny nose, watery eyes, and itching.

Others take quercetin for general anti-inflammatory and antioxidant effects. Quercetin seems to have powerful anti-inflammatory and antioxidant capabilities, reducing oxidation and inflammation throughout the body. Inflammation is a key risk factor for disease.

Many anti-aging supplements are rich with anti-inflammatories and antioxidants, which is why some people take quercetin for anti-aging.

Quercetin may also reduce the risk of degenerative brain disorders – possibly by providing your brain with antioxidants and anti-inflammatories.

Quercetin may also support respiratory health and sinus health.

Some take quercetin to maintain cardiovascular health. There’s some evidence that quercetin supports heart and blood vessel health, for example. Multiple studies have shown that quercetin relaxes blood vessels, lowering blood pressure.

Some diabetics take quercetin to help control blood sugar. There’s some evidence that quercetin could act as a natural blood sugar support formula.

As reported by WebMD, some people even take quercetin to prevent cancer.

Some athletes (or weekend warriors) take quercetin supplements to reduce muscle fatigue and soreness after a workout.

Others take quercetin for autism, enlarged prostate, high cholesterol, lung cancer, kidney issues, arthritis, asthma, and other illnesses, although there’s limited scientific evidence supporting quercetin for any of these diseases.

Next, we’ll talk about the scientific evidence behind quercetin, including studies verifying several of these benefits.

Benefits of Quercetin Supplements

Quercetin is a bioflavonoid found in certain fruits, vegetables, and grains.

You may already get a small amount of quercetin in your ordinary diet: quercetin is found in onions, kale, tomatoes, broccoli, asparagus, berries, red wine, citrus fruits, cherries, and tea. Many people also take quercetin in supplement form.

In fact, it’s estimated that the average person consumes about 10 to 100mg of quercetin per day through a normal diet. Quercetin is one of the most abundant flavonoids in the human diet.

Quercetin is a pigment that belongs to a group of plant compounds called flavonoids (also known as bioflavonoids). Flavonoids are naturally present in fruits, grains, teas, and wine. Researchers have linked flavonoids to a variety of benefits, including a reduced risk of heart disease, cancer, and degenerative brain disorders.

Bioflavonoids like quercetin provide benefits by working as antioxidants. Antioxidants neutralize oxidation in your body by binding to free radicals. Free radicals are unstable molecules that cause cellular damage. The damage caused by free radicals is linked to a number of illnesses, including cancer, heart disease, and diabetes.

What does science have to say about quercetin? Can quercetin really fight inflammation and reduce the risk of disease? Let’s take a closer look at the science behind quercetin.

Quercetin has been shown to reduce inflammation in multiple studies. In this study, researchers found quercetin reduced inflammation in human cells in test tubes, including tumor necrosis factor alpha (TNFα) and interleukin-6 (IL-6).

Researchers in this 2010 study published in the American Journal of Clinical Nutrition found similar results, concluding that quercetin was “equally or more effective than resveratrol in attenuating tumor necrosis factor alpha-mediated inflammation and insulin resistance” in human cells in a test tube.

Researchers have noticed similar results in humans. In this 8 week study involving 50 women with rheumatoid arthritis, participants took 500mg of quercetin per day or a placebo. The quercetin group reported less early morning stiffness, morning pain, and after-activity pain. Researchers also observed reduced markers of inflammation, including TNFα.

Early studies on quercetin and inflammation are promising, although more largescale human studies need to be performed to verify these benefits.

There’s evidence that quercetin reduces allergy symptoms. Researchers believe quercetin’s anti-inflammatory effects may relieve allergy symptoms.

This study published in Molecules in 2016, for example, found that quercetin could be effective for treating the anaphylactic (allergic) reaction in someone with peanut allergies. A similar study from 2006 concluded that quercetin was a “safe, natural therapy that may be used as primary therapy or in conjunction with conventional methods” for blocking allergies. And in this study, researchers found that quercetin supplements suppressed peanut-related anaphylactic reactions in mice.

It’s possible that quercetin has the same anti-allergy effect in humans, although more research needs to be done.

There’s some evidence that quercetin has cancer-fighting properties. Researchers believe quercetin can fight cancer cells with its powerful antioxidant properties.

In 2015, researchers reviewed available test tube and animal studies on quercetin and prostate cancer. After reviewing available evidence, researchers found that quercetin suppressed cell growth and induced cell death in prostate cancer cells.

This study published in 2017 in Oncology Reports took things a step further, finding that quercetin induced cancer cell death in nine types of cancer, including prostate cancer, colon cancer, and breast caner.

In another 2017 study, researchers gave quercetin to mice with tumors. Researchers found that mice in the quercetin-treated group showed delayed tumor growth, no significant changes in daily behavior, significantly better survival ratings, and increased rates of cell death.

Quercetin may also target bladder cancer. In 2016, researchers published a landmark study in the American Journal of Cancer Research. Researchers analyzed quercetin’s effect on cancer cells in a test tube. They concluded, “We are the first to show that quercetin displays potent inhibition on bladder cancer cells via activation of AMPK pathway.”

Early research on the cancer-fighting benefits of quercetin is promising, although more research needs to be performed to verify these effects in humans.

Other evidence suggests quercetin lowers your risk of chronic brain disorders, including Alzheimer’s and dementia.

In this study published in Neuropharmacology in 2015, researchers gave quercetin to mice with Alzheimer’s, injecting them with quercetin every two days for three months. By the end of the study, the injections had reversed several markers of Alzheimer’s, and the mice performed much better on learning tests.

In a separate study published in 2018, researchers gave mice with Alzheimer’s a quercetin-rich diet. Researchers found the diet improved brain function in mice with early-middle stage Alzheimer’s, although it had no significant effect on middle-late stage Alzheimer’s.

You may have heard that coffee is linked to a reduced risk of Alzheimer’s. There’s certainly some research to back that claim up. However, recent research has suggested that quercetin (not caffeine) is the primary compound in coffee responsible for protective effects against Alzheimer’s.

Some people use quercetin to reduce blood pressure and improve other measurements of cardiovascular health. High blood pressure raises your risk of heart disease, which is the leading cause of death in the United States. Approximately 1 in 3 American adults have high blood pressure.

Research suggests that quercetin reduces blood pressure levels. In this study published in 2002, researchers found that quercetin exhibited vasodilator effects, widening blood vessels and reducing blood pressure. Another study from 1996 found that quercetin had similar relaxing effects to resveratrol, with both flavonoids reducing blood pressure in different ways.

Researchers have observed similar effects in mice. When mice with high blood pressure received quercetin daily for five weeks, their systolic and diastolic blood pressure values dropped by 18% and 23%, respectively.

Multiple studies on humans have suggested similar benefits. Researchers reviewed nine human studies involving 580 people. After reviewing available evidence, researchers found that taking more than 500mg of quercetin supplement per day reduced systolic and diastolic blood pressure by 5.8mm Hg and 2.6 mm Hg, respectively. In other words, quercetin was shown to significantly improve blood pressure readings.

Some people take quercetin for its anti-aging effects. Antioxidants and anti-inflammatories – including quercetin – seem to have powerful anti-aging benefits. One study on young mice found that quercetin reduced mortality and extended lifespan. Another study from 2017 on human cells in test tubes found that quercetin reduced aging markers, with researchers concluding there was “anti-aging potential” for quercetin.

Others take quercetin supplements to improve endurance and exercise performance. This 2011 study reviewed 11 quercetin studies involving 254 human subjects and found that quercetin provided a statistically significant benefit in human endurance exercise capacity (VO2 max) and endurance exercise performance, although the effect “is between trivial and small”.

Finally, some diabetics take quercetin to help manage blood sugar. This study from 2019 found that taking 500mg of quercetin per day significantly reduced fasting plasma glucose (FPG) levels, suggesting that quercetin helped control fasting blood sugar. This study in 2019 found similar results, finding that quercetin lowered serum glucose levels at doses of 10, 25, and 50mg per kg.

Some suggest that quercetin could treat the COVID-19 coronavirus. Quercetin was shown to be effective against SARS, the Ebola virus, and the Zika virus. This 2019 study by researchers in Korea found that quercetin and other flavonoids may inhibit the proteolytic activity of SARS-CoV 3C-like protease, creating an antiviral effect. Research on the coronavirus and quercetin is ongoing, and it’s unclear if quercetin will have similar antiviral effects against COVID-19. To be clear, there’s no evidence suggesting that quercetin treats, prevents, or manages the COVID-19 coronavirus, although research is ongoing.

In this study from the University of Michigan in 2014, researchers reviewed available evidence and concluded that quercetin was “a promising treatment for the common cold” and other respiratory viruses. Other studies have shown that quercetin could reduce symptoms of the cold and flu, which are caused by different viruses.

Ultimately, early research on quercetin is promising. However, many of the studies above involve test tubes or animal models – not human subjects. The quercetin studies on human subjects have been small – but most have delivered positive results.


Most quercetin studies use a dosage of around 500mg per day, although some studies use a dosage of 500mg taken twice per day.

Most supplements have a similar dosage, offering 500mg to 1,200mg of quercetin per serving.

In some studies, researchers have given participants up to 5,000mg of quercetin per day with no reported side effects.

Quercetin has poor bioavailability. You might take a 1,200mg quercetin supplement, but your body only absorbs a small percentage of it. That’s why many quercetin supplements contain vitamin C or bromelain, as some evidence suggests they boost absorption.

There’s also some evidence that quercetin has a synergistic effect when combined with other flavonoid supplements. That’s why some quercetin supplements contain resveratrol, catechins, genistein, and other flavonoids.

Side Effects

Quercetin is generally recognized as safe. It’s found in many fruits and vegetables, and most people will experience no side effects when taking normal dosages of quercetin.

There have been few reported side effects for quercetin supplements.

In some studies, large doses of quercetin (over 1,000mg) were linked with headaches, digestive issues, and tingling sensations. However, these symptoms were mild and uncommon.

Quercetin from food sources is safe for pregnant and breastfeeding women to take. However, there’s limited research on quercetin supplements in pregnant or breastfeeding women.

There’s no evidence that quercetin interacts with any drugs in a significant way. However, you should talk to your doctor before taking quercetin, especially if you are taking antibiotics or blood pressure medication.

Frequently Asked Questions About Quercetin

This section will help to answer some of the most commonly asked questions about Quercetin, as well as the leading companies in this growing industry.

Q: What is quercetin?

A: Quercetin is a natural compound found in many plant-based foods. It’s a bioflavonoid and pigment that seems to have potent anti-inflammatory and antioxidant effects. Consumers often use it for a number of health benefits it helps to promote, including cardiovascular, respiratory, and circulatory health.

Q: What are the best foods for quercetin?

A: Capers, peppers (yellow and green), onions (red and white), shallots, asparagus, cherries, tomatoes, red apples, red grapes, broccoli, kale, red leaf lettuce, cranberries, blueberries, raspberries, green tea, black tea, and coffee are all excellent foods for quercetin.

Q: Do you get enough quercetin in your daily diet?

A: The average person gets 10 to 100mg of quercetin per day through normal dietary sources. This can vary greatly. Carefully track your diet over an extended period to figure out if you have a dietary deficiency of quercetin.

Q: How much quercetin should you take per day?

A: Researchers typically use a dose of 500mg of quercetin per day in supplement form. Most quercetin supplements contain between 500 and 1200mg of quercetin, although this can vary. Check out the nutritional label for your quercetin supplement to be sure.

Q: How does quercetin work?

A: Quercetin works by providing your body with antioxidants and anti-inflammatories. Many quercetin benefits seem specifically linked to the antioxidant and anti-inflammatory effects. Improved sinus, cardiovascular, and circulatory health can result from these anti-inflammatory impacts on the body.

Q: Does quercetin help allergies?

A: Many people take quercetin supplements to avoid allergy symptoms. There’s evidence that quercetin has powerful anti-allergy benefits, although more research needs to be done.

Q: Does quercetin fight cancer?

A: Early research in test tube and animal models shows that quercetin may have cancer-fighting properties. While these findings are promising, more large scale human studies need to be performed. Research is not definitive. Consult your physician before using any supplement to improve your cancer.

Q: Does quercetin reduce the risk of Alzheimer’s?

A: Studies show that quercetin may reduce the onset of Alzheimer’s, particularly in the early and middle stages of the condition. However, studies have mostly been performed on mice and test tubes – not in humans.

Q: What are other names for quercetin?

A: Quercetin goes by a number of different names. You might see quercetin supplements labeled as bioflavonoid concentrate, bioflavonoid extract, or citrus bioflavonoid, for example.

Q: Can quercetin help you recover after exercise?

A: Some studies show that quercetin boosts recovery after exercise. In some small studies, athletes taking quercetin after exercise had faster recovery than a control group. Researchers believe quercetin reduces oxidative stress and post-exercise inflammation, helping your body recover.

Q: What are the side effects of quercetin?

A: Most people experience no side effects from quercetin, and any side effects tend to be mild. Quercetin side effects include tingling and numbness, headache, and nausea. Your chance of experiencing side effects increases at higher dosages (over 1,000mg).

Q: Why do so many quercetin supplements contain bromelain?

A: Your body doesn’t absorb quercetin very effectively on its own. Some studies have shown that bromelain boosts the absorption of quercetin, which is why you find bromelain (or vitamin C) in many quercetin supplements.

Q: What’s the difference between rutin or glycosidic quercetin?

A: Quercetin is found in two forms, including in rutin or glycosidic form. Quercetin glucosides, such as isoquercitrin and isoquercetin, seem to be much more bioavailable and more quickly absorbed than quercetin aglycone or quercetin glycosides, such as rutin (quercetin rutinoside).

Q: Can you overdose on quercetin?

A: In one study, researchers gave participants 2,000mg to 5,000mg of quercetin per day with no adverse effects or signs of toxicity reported. Generally, quercetin is safe to take even in high doses, although you may experience mild side effects like nausea, digestive issues, and headaches at high doses. Excessively high doses of quercetin could lead to kidney problems.

Q: How much quercetin should you take for hay fever?

A: Experts recommend taking 400mg of quercetin twice a day between meals for hay fever. Also consult your doctor to help provide a more comprehensive and effective treatment for hay fever.

Q: Can children take quercetin?

A: Most studies suggest that it’s safe to give quercetin to your child, although you should use only half the dose you'd use on an adult. Talk to your pediatrician before giving any quercetin to your child.

Q: How does quercetin manage allergy symptoms?

A: Studies have shown that quercetin stabilizes mast cells that release histamine. Histamine is the principal mediator of reactions to pollen and other allergies. This makes quercetin a natural antihistamine. Many people use quercetin to treat symptoms of hay fever, including runny nose, watering eyes, and itching.

Q: Can you take too much quercetin?

A: You should start with a quercetin dosage of around 500mg per day to assess your tolerance. However, researchers have given participants up to 5,000mg of quercetin per day with few reported side effects. Look for symptoms like upset stomach and diarrhea. Excessively high doses of quercetin could lead to kidney problems.

Q: Who should not take a quercetin supplement?

A: Quercetin appears safe for anyone to take when used in normal dosages. However, there’s limited research on how quercetin supplements affect women who are pregnant or breastfeeding. People with high blood pressure, or anyone taking blood pressure medication, may also want to take to their doctor before taking a quercetin supplement.

Q: Can you take a quercetin supplement with a pineapple allergy?

A: If you’re allergic to pineapples, you should avoid quercetin supplements with bromelain. Bromelain, an enzyme in pineapples, is added to quercetin supplements to boost bioavailability. Overuse of bromelain can create problems for consumers.

Q: What are the benefits of quercetin?

A: Quercetin is linked with a range of benefits, including anti-cancer, anti-allergy, and anti-inflammatory benefits, among many other effects.

Q: Is quercetin proven to work?

A: Most quercetin research has involved animal studies (like mice or rats) or human cells (in test tubes). researchers have performed several large scale studies on quercetin in humans, although more research is needed to verify quercetin’s benefits.

Q: Does quercetin work for anti-aging?

A: Several studies have examined the effect of quercetin on aging. Quercetin is rich with anti-inflammatories and antioxidants, which could make it a powerful anti-aging compound.

Q: Does quercetin help asthma?

A: Quercetin may help asthma by relaxing smooth muscles lining the airway, improving airway flow.

Q: What’s better – quercetin tablets, capsules, powders, or liquid?

A: Quercetin liquid claims to be more bioavailable than other sources of quercetin. You take the liquid sublingually (underneath your tongue). However, limited research shows quercetin capsules or powders are more effective, and all forms of quercetin are absorbed poorly by the body.

Q: Can you give quercetin to your pet?

A: Some quercetin supplements are specifically advertised as allergy supplements for dogs. By giving your dog a quercetin supplement, you can purportedly reduce symptoms of allergies.

Q: Where does quercetin come from?

A: Some quercetin comes from citrus sources. Most supplement companies use various plant or vegetable-based sources of quercetin. Check the label.

Q: Can you get citrus-free quercetin?

A: Some quercetin supplements are specifically marketed as citrus-free, making them ideal for those with citrus sensitivities. Read the label or official product website for your supplement to be sure that it is actually citrus-free.

Q: What is bromelain?

A: Bromelain is a naturally occurring, protein-digesting enzyme found in the stem of the pineapple. Bromelain seems to boost the absorption of quercetin by inhibiting inflammatory chemicals called prostaglandins. Bromelain may also decrease inflammation on its own.

Q: Does quercetin help with diabetes?

A: There’s some evidence that quercetin helps with diabetes, helping your body manage blood sugar levels during fasting. However, more research needs to be done to verify these benefits.

Q: What are the best quercetin supplements?

A: Any of the top-ranked quercetin supplements on our list are good quercetin supplements, including the supplements from Now Foods, Solgar, and Oregon’s Wild Harvest.

Q: Is quercetin non-GMO?

A: Quercetin supplements are generally labeled non-GMO. Check the label to verify your quercetin supplement is not made from genetically modified ingredients.

Final Thoughts

Quercetin is a bioflavonoid with potent antioxidant and anti-inflammatory effects. Many take quercetin supplements daily to support various body systems.

Some people take quercetin supplements for allergies. Others take it to boost the immune system. Others take quercetin for general anti-aging or health and wellness.

Early research on quercetin is promising, and new human studies are released every year validating certain quercetin benefits. Consider buying one of the quercetin supplements listed above to enjoy the benefits of quercetin.

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