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8 Potential Quercetin Benefits + Side Effects & Dosage

Written by Puya Yazdi, MD | Reviewed by Ana Aleksic, MSc (Pharmacy) | Last updated:
Medically reviewed by
Jonathan Ritter, PharmD, PhD (Pharmacology) | Written by Puya Yazdi, MD | Reviewed by Ana Aleksic, MSc (Pharmacy) | Last updated:

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The antioxidant quercetin is sometimes called the “master flavonoid.” People say it’s one of the best natural antihistamines–allegedly, one that can stabilize mast cells and reduce inflammation. Is any of this true? Read to understand what the latest science says about quercetin and whether there is any way to overcome its poor bioavailability.

What is Quercetin?

Most people have heard of flavonoids, plant-based antioxidant pigments that are being touted for many alleged health benefits. Flavonoids give plants their color and belong to the class of polyphenols. Polyphenols became a hot topic recently when some studies suggested their benefits in preventing heart disease, cancer, and other chronic diseases [1, 2].

The Master Flavonoid

Many vegetables, fruits, nuts, honey, and medicinal herbs are rich in quercetin. Raw capers have the highest amount of quercetin, while apples are the most common food source. Quercetin makes about 75% of all flavonoids consumed through diet [3].

Quercetin is also relatively better researched than most other flavonoids. Thus, quercetin has earned the nickname “master flavonoid” [3].

However, this doesn’t mean its potential health benefits are clear. In fact, most of the alleged health benefits of quercetin have not been verified by proper clinical trials. Quercetin has not been shown to treat or prevent cancer or other diseases.

Although quercetin supplements are widely available, they have not been approved by the FDA for medical use. Supplements generally lack solid clinical research. Regulations set manufacturing standards for them but don’t guarantee that they’re safe or effective. Speak with your doctor before supplementing.

The FDA has issued warning letters to several manufacturers advertising unauthorized health claims. Their quercetin product labels and websites listed claims such as treating diseases, for which quercetin has never been approved. Making such claims places these products in the “unapproved drugs” category by the FDA.

On the other hand, quercetin has cultural and historical significance. Ever since antiquity, people put great value on quercetin-rich foods. For example, people consumed pomegranate as an elixir for good health and longevity.

Antioxidant Potential & Research

Quercetin is an antioxidant flavonoid. Limited studies suggest it may scavenge free radicals and reduce tissue and DNA damage. It seems to boost antioxidant defense, which might be helpful for health conditions linked to oxidative stress. According to some theories, most chronic health problems in the modern world have been linked with excessive oxidative stress and free radicals [4, 5, 2].

A PubMed search returns almost 17k studies about Quercetin. However, clinical trials are rare, small, and of questionable quality. About 200 clinical trials involving quercetin have been carried out so far. So is there anything special about it and how weak is the evidence?

How it Works

Limited studies suggest quercetin may [6+, 2, 7]:

  • Neutralize free radicals and ROS
  • Reduce oxidative damage to fats
  • Boost levels of glutathione
  • Increase the blood’s overall antioxidant power
  • Reduce inflammation by blocking inflammatory substances and pathways (including COX-2 and CRP)
  • Be active against some bacteria and viruses
  • Reduce the expression of inflammatory genes (such as those that make TNF-alpha)
  • Block the release of histamine, which affects allergies and mast cell activation



  • May be anti-inflammatory
  • Alleged natural antihistamine
  • May increase antioxidant protection
  • Found in fruits, nuts, and herbs


  • Poor bioavailability
  • May alter thyroid function
  • Inhibits COMT
  • Unknown long-term safety
  • Few large-scale clinical trials

Purported Benefits of Quercetin

Insufficient evidence for:

The following purported benefits are only supported by limited, low-quality clinical studies. There is insufficient evidence to support the use of quercetin for any of the below listed uses.

Remember to speak with a doctor before taking quercetin supplements. Quercetin should never be used as a replacement for approved medical therapies.

1) Inflammation

There is insufficient evidence to support the use of quercetin for inflammatory disorders.

Quercetin may decrease inflammatory cytokines that can damage tissues in humans [8, 6+].

There’s limited scientific ground for using quercetin to reduce prostate inflammation and enlargement. In an initial small study, it reduced symptoms of prostate inflammation in men by 75% [9].

In the next study of 30 men, quercetin (1000 mg/day) reduced prostate inflammation and pain in 67% of them after 1 month. Then 17 men also received bromelain and papain as an add-on to enhance quercetin absorption, along with palmetto and cranberry. This combination improved symptoms in over 80% of the men [10].

In cells, quercetin decreases the release of the following inflammatory compounds: MCP-1, IL-6, and IL-8 [11].

Quercetin blocks the production of prostaglandins, key mediators of the inflammatory response. It also blocks, COX-2, an inflammatory enzyme that NSAID drugs target [12, 13+].

2) Metabolic Health

There is insufficient evidence to suggest that quercetin should be used to improve metabolic health.

Quercetin (1000 mg/day) improved the metabolic profile in 78 obese women with PCOS in one clinical trial. It was used over 12 weeks and reduced an obesity marker (resistin), and well as testosterone and LH [14].

3) Arthritis

Evidence is lacking to support the use of quercetin for rheumatoid arthritis. Larger clinical trials are needed. Studies conducted so far had mixed results.

In one study, people with Rheumatoid Arthritis who consumed lots of raw berries, fruits, vegetables, nuts, roots, seeds, and sprouts rich in Quercetin and other antioxidants had fewer symptoms [15].

Quercetin supplements (500 mg/day) had no effect on some inflammatory markers (CRP) but did reduce others (TNF-alpha and IL-6) in an 8-week study of 51 women. But in a later 8-week follow up study in 50 women, the same dose did reduce joint stiffness, morning pain, after-activity pain and the inflammatory marker TNF-alpha [16, 17].

In a cellular study, Quercetin triggered the death of inflammatory joint cells that contribute to the development of rheumatoid arthritis. In another study, it also stopped these cells from dividing and prevented neutrophil activation, which worsens the autoimmune response [18, 19+].

4) Heart Health & Blood Flow

Insufficient evidence is available to say that quercetin improves heart health or blood. The published research is encouraging, but large-scale studies are lacking.

Quercetin (730/day) lowered blood pressure in a trial of 41 people with high blood pressure after 28 days [20].

In a trial of 72 women with type 2 diabetes, Quercetin (500 mg/day) reduced systolic blood pressure after 10 weeks [21].

Lower dose quercetin (100 mg/day) from onion peel extract improved blood lipid profiles, glucose, and blood pressure in a study of 92 smokers. It reduced total and “bad” LDL cholesterol while increasing “good” HDL cholesterol, overall improving heart health [22].

In a clinical trial of 10 healthy men, a combination quercetin supplement (200 mg quercetin with EGCG and epicatechin) increased nitric oxide status. Nitric oxide helps expand the blood vessels to deliver more blood to the body. It also reduced endothelin-1, which narrows blood vessels and counteracts nitric oxide [23].

In one observational study of 120 healthy people, a multivitamin supplement with quercetin increased blood quercetin levels, reduced homocysteine, and GGT, which are important for heart health and circulation [24].

Scientists are exploring whether quercetin supplements can partially protect people exposed to high levels of oxidative stress (such as cigarette smokers) from heart disease [25].

5) Immune Defense

Based on the existing evidence, quercetin may not have an effect on immune defense. More research is needed.

In a study of ~1000 people, Quercetin (1000 mg/day) reduced the number of sick days and the severity of common cold symptoms in physically-fit people 40 or older [26].

Endurance athletes are more likely to catch a cold since they frequently stretch their bodies to exhaustion. Quercetin (100 mg/day) reduced the incidence of upper respiratory infections such as the common cold in a trial of 40 trained athletes. It was given after 3 days of intense exercise over the 2-week exercise recovery period [27].

However, quercetin alone (1000 mg/day) for three weeks before, during, and for two weeks after the 160-km Western States Endurance Run didn’t lower flu incidence in another study [28].

6) Post-Exercise Recovery

In one trial, Quercetin (1000 mg/day) reduced inflammation in a trial of 30 cyclists following heavy training. It had a stronger effect combined with other antioxidants and anti-inflammatories: EGCG, isoquercetin, EPA, and DHA [29].

Quercetin (1000 mg/day) reduced post-exercise inflammation and oxidative stress after 2 weeks in young untrained men [30].

Additional studies should confirm these findings.

7) Athletic Endurance

The majority of studies suggest that taking quercetin before exercise does not decrease fatigue or improve exercise ability. Therefore, quercetin is likely ineffective for improving athletic performance.

In clinical trials of over 200 people in total, the effects of quercetin on endurance exercise capacity (VO2 max and performance) were trivial [31, 32].

In two smaller and less reliable studies, quercetin (1000 mg/day) increased endurance and reduced fatigue (in 12 untrained people and 10 young men after resistance training) [33, 34].

8) Ulcers

Based on the available clinical data, quercetin is likely ineffective for ulcers.

In a trial of 40 men, quercetin applied directly to mouth ulcers relieved pain and completely healed the ulcers in half of the cases within 7–10 days [35].

Quercetin is being researched against stomach ulcers, Helicobacter pylori, and acid reflux in animals and cells [6+].

Lacking Evidence (Animal Research)

No valid evidence supports the use of quercetin for any of the conditions listed in this section.

Below is a summary of the existing animal and cell-based research, which should guide further investigational efforts.

However, the studies listed below should not be interpreted as supportive of any health benefit. Quercetin should not be used for any of the conditions described below due to a complete lack of safety and efficacy data in humans.

1) Diabetes

Mice fed a Quercetin-rich diet had lower blood glucose levels and HBA1c. Quercetin may block the enzymes that degrade complex sugars in the gut after meals. As a consequence, less glucose is absorbed from food [36].

In rats with type 1 diabetes, Quercetin lowered blood sugar levels [37].

Quercetin also improved insulin levels in diabetic mice and reduced the activity of liver and pancreas genes that can trigger diabetes [38].

In obese rats, Quercetin supplementation improved insulin resistance [39].

Quercetin increases glucose uptake into fat cells by increasing the number and activity of glucose transporters. It also sensitizes a pathway that controls insulin release in response to glucose (ERK1/2) (GLUT4) [40, 41, 42].

One cell study analyzed the effects of ten compounds from berries on glucose uptake. Two forms of Quercetin had the strongest effect on glucose uptake into tissues via the AMPK pathway (sugar-bound Quercetin-3-O-glycoside and the free Quercetin aglycone) [43, 44].

Quercetin might also block the NF-kb pathway [45].

2) Brain Health

Scientists are studying if quercetin can protect brain cells from oxidative stress [46].

It may shield the brain from toxic substances, according to studies in mice. It increased an antioxidant enzyme, superoxide dismutase (SOD) and decreased markers of oxidative stress. It also improved cognition, learning, and memory [47].

In mice, it also had an epigenetic effect: increasing the expression of genes that boost the function of existing brain cells and regenerate old or damaged ones [47].

Flavonoids, including quercetin, block inflammatory molecules in the brain [48].

Additionally, quercetin reversed cognitive deficits in aged mice with Alzheimer’s disease. It also prevented disease worsening but had the strongest effect in the early-middle stages of the disease [49].

Antipsychotics used to treat schizophrenia can cause movement disorders as a side effect, which are similar to Parkinson’s. Quercetin reduced these side effects in mice given antipsychotics [46].

3) Leaky Gut

According to some theories, chronic stress can over-activate mast cells in the gut, which leads to increased inflammation and permeability of the gut lining (“leaky gut”) [50, 51].

Certain scientists hypothesize that quercetin has dual action: it might help rebuild a healthy gut barrier and prevent mast cells from flooding the gut with histamine. Their theories remain unproven, however [50, 51].

In rat studies, quercetin blocked histamine release and stabilized gut mast cells. This may help both prevent and heal leaky gut [52].

Quercetin reversed “leaky gut” in mice and helped rebuild the gut barrier. Once the gut lining was restored, inflammation decreased as well [53].

In another study, it tightened the junctions between gut cells in a cellular study. It increased the activity of genes that make the gut lining and reduce gut inflammation, which may help strengthen the gut barrier and prevent unwanted food particles from entering the bloodstream [54].

4) Anti-Aging

Scientists are investigating whether quercetin has any anti-aging properties. The existing evidence is inconclusive.

Scientists think that quercetin might be a “senolytic,” a natural compound that may stop the aging process. In studies on human skin cells, it eliminated harmful, aging senescent cells [6+].

Quercetin extended the lifespan and increased stress resistance in worms. Another study suggested that it increases the ability of worms to handle stress while increasing their average lifespan by 15% [55, 56].

However, it is unclear how these cellular and worm studies translate to humans. A recent study found that Quercetin does not extend the lifespan of animals, which should serve as a reminder that “benefits” in cell culture often don’t translate to living beings [57].

5) Obesity

The effects of quercetin on obesity in experimental animals cannot be translated to humans. Many compounds (like quercetin) are initially explored for their anti-obesity properties in animals, but they later fail to have any weight loss benefits in humans.

In mice, Quercetin supplementation reduced body weight by nearly 40%, reduced inflammatory cytokines increased in obesity, and boosted fat burning. It also increased anti-inflammatory defense (IL-10) [58].

Quercetin reduced weight gain caused by a high-fat diet and improved insulin sensitivity and glucose tolerance in mice [59].

In rats, it reduces obesity-triggered skeletal muscle wasting by blocking inflammatory receptors and their activity [60].

High dose Quercetin reduced blood glucose levels, improved blood lipids and reduced high blood pressure in obese rats. Quercetin enhanced the sensitivity of fat tissues to glucose (via GLUT4 translocation and AKT signaling), which causes fats to take more glucose from the blood and use it [39, 59].

In cell studies, it reduced fat accumulation and inflammation from obesity [58].

Quercetin turned off obesity genes linked to inflammation (AMPK and MAPK pathways), which stops tissues from storing new fats and triggers the destruction of existing fat cells [61].

6) Cancer Prevention Research

Quercetin has not been shown to treat or prevent cancer.

Scientists are researching whether quercetin and other flavonoids from fruits and vegetables may contribute to cancer prevention. According to some studies, people who eat more fruits and vegetables tend to have a lower risk of certain types of cancer [62].

One observational study on almost 1,000 people suggested a link between frequent intake of quercetin-rich foods and lower risk of developing lung cancer. The association was stronger in those under 50 years of age [63].

However, both studies deal only with associations. Proper clinical data are still lacking

Similarly, smokers who consumed lots of antioxidant-rich phenols were thought to be slightly better protected against bladder cancer in one study. The authors emphasized that their findings need to be verified and explored further [64].

Quercetin lowers TNF-a and, which, according to some hypotheses, may contribute to cancer prevention; TNF-a encourages the growth and spreading of most tumor cells. In fact, mice with TNF-a deficiencies are resistant to skin cancer. Quercetin increased the lifespan of mice with leukemia [65, 66].

Cellular studies are investigating the potential mechanisms of TNF-a-lowering flavonoids, including quercetin. Quercetin was studied in the following types of cells [67]:

  • Colon cancer cells (blocking the NF-κB pathway) [68].
  • Leukemia cells (inhibiting Cox-2 expression and initiating apoptosis) [69, 62].
  • Brain and liver cancer cells [70, 71].
  • Breast cancer cells [66].

However, many substances have anti-cancer effects in cells, including downright toxic chemicals like bleach. This doesn’t mean that they have any medical value. In fact, most substances (natural or synthetic) that are researched in cancer cells fail to pass further animal studies or clinical trials due to a lack of safety or efficacy.

Thus, much more research is needed before the effects of quercetin on cancer in people are determined [72].

7) Histamine Release

Many people with histamine issues claim that quercetin helped them, especially those who are TH2-dominant. No valid evidence backs them up.

Only cell-based and animal studies have been carried out. Ongoing research efforts should determine if quercetin can:

  • Reduce histamine and other inflammatory substances like leukotrienes, and prostaglandins [2].
  • Reduce inflammation in cells and/or turn off the histamine receptor gene (H1R) [73].

Until further studies are published, the effects of quercetin on histamine release remain unknown.

8) Bacterial Infections

Quercetin was studied against various types of bacteria in test tubes (Staphylococcus, S. aureus, H. Pylori) [74, 75].

It blocked the growth of oral bacteria in cellular studies. Quercetin may block an important enzyme bacteria need to survive (DNA gyrase) [76, 77].

9) Allergies & Asthma

People say quercetin helps with Th2 dominance, but research is lacking. We can’t draw any conclusions from the existing animal and cell-based studies.

Quercetin relaxed smooth muscles that line the airways in a tissue study, which improves airway flow [78].

Lactose, eggs, peanuts, fish, wheat, shellfish, tree nuts, and soy can all trigger an immunoglobulin E (IgE) allergic responses [79].

Quercetin reduced allergies and balanced the immune response in cellular and animal studies [80, 81].

Mast cells are activated during an allergic response or in people with mast cell activation syndrome. Overactive mast cells promote inflammation by releasing molecules such as histamine, leukotrienes, cytokines, and other harmful products. Quercetin blocks mast cell activation in cells [6+].

Some people with hay fever have an over-expression of the histamine H1 receptor (H1R) gene. Increased expression of this gene has been linked with more severe allergic symptoms. Quercetin may reduce the expression of this gene [73].

10) Liver Health

Quercetin given before toxic amounts of alcohol protected the liver of rats against oxidative stress. It neutralized harmful products of fat breakdown and increased the production of the master antioxidant Glutathione [82].

Quercetin protected the liver, limited damage and oxidative stress in rats exposed to toxins (aflatoxin) [83].

Acetaminophen can cause serious liver damage in high doses, and overdoses in humans are not rare. Quercetin can reduce liver damage from acetaminophen by neutralizing free radicals. It protected both the kidneys and liver in rats and improved mitochondria health [84].

In rats with liver damage, Quercetin improved liver health, decreased liver scarring, oxidative stress and DNA damage [85].

Quercetin protected against obesity-induced fatty liver disease in mice by activating the mitochondria and improving energy use in the liver [86].

11) Kidney Health

In rats given the chemotherapy drug cisplatin, quercetin protected the kidney tissue [87].

Additionally, it reduced kidney damage and restored kidney antioxidant enzymes in another rat study [88].

However, these studies used quercetin injections, which have good bioavailability.

12) Sexual Function

Oxidative stress is a primary cause of the inability to get or maintain an erection, also known as erectile dysfunction. Quercetin improved erectile dysfunction by reducing levels of oxidative stress and increasing blood-vessel-relaxing nitric oxide in diabetic mice [89].

13) Eye Health

Quercetin may act on vision pathways (oxidative stress, glycation, and cell signaling) [90].

In rats with cataracts, it reduced eye damage and enhanced lens clarity [91].

Retinal cells found at the back of the eyes act as light receptors and play an important role in setting the color, resolution, and brightness of your vision. Quercetin had a protective effect on retinal cells and increased their survival [92, 93].

Limitations and Caveats

Most of the studies mentioned here were done in animals, although some clinical trials have been carried out. All of the listed potential benefits would rely on quercetin being absorbed. Poor absorption and bioavailability of quercetin is a major issue.

Quercetin Dosage & Bioavailability

Typical Dosage

The dosage in clinical trials varied between ~100-1,000 mg/day. The most common dose was 500-1,000 mg/day [3].

The main problem with Quercetin is its poor bioavailability. Quercetin bioavailability in typical oral supplements is ~2%.

It’s important to remember that Quercetin is available in many forms: free quercetin (the aglycone) or quercetin bound to various sugar molecules. Rutin from apples, for example, is sugar-bound quercetin. Not all of these types of quercetin have the same bioavailability. For example, Quercetin from onion powder is better absorbed than quercetin from apple peel powder [94].

Once quercetin is ingested through food, the sugar bound forms are degraded and free quercetin is released. Free quercetin is metabolized very quickly in the small intestine, the kidneys, the large intestine, and the liver, giving rise to numerous metabolites that are probably not active [6].

Once quercetin is in the gut, its bioavailability also depends on how well it’s modified to be made more soluble [6+].

For Dogs

Quercetin is sometimes added to commercially-available dog food. Similar to humans, dogs metabolize quercetin very quickly. Its bioavailability in dogs is also low. Unlike for humans, dogs absorb the rutin form of Quercetin found in apples better than humans [95].

Some people use Quercetin to reduce allergies in dogs. In one study, dogs fed antioxidant- and Quercetin-rich diets had better metabolism and less free radicals [96].

The human dosage could be adapted to dogs if using Quercetin supplements, although the bioavailability remains uncertain.

Based on the dog size, the dosage may need to be reduced. For example, very small dogs would need only 1/10 of a typical human dose (if the dog is 1/10 the size and weight of an average person).

Talk with your vet before giving quercetin to your dog.

What Increases its Absorption?

The following may increase quercetin absorption and bioavailability:

  • Taking it with fats or oils. The oils stimulate bile production, which can make quercetin soluble in the gut and easier to absorb [97]
  • Liposomal or nano-quercetin [98, 99, 100]
  • Adding it to foods, such as cereal bars (possibly) [94]
  • Taking quercetin from onion powder instead of from apple peel powder [94]
  • Quercetin 3-glucose as opposed to the free quercetin (in rats) [101]
  • Alcoholic tinctures, estimated to be ~40% bioavailable [6+].
  • Combining it with bromelain, which increases both its bioavailability and anti-inflammatory effects [102]

EGCG Potential Synergy

The combination of quercetin and resveratrol, a polyphenol from grapes may have added health benefits. In rats, only the combination of both reduced fat deposits, while each resveratrol or quercetin alone did not have any effects [103].

Flavonoids may act in synergy to increase antioxidant defense. Quercetin increases the bioavailability of EGCG and other antioxidant flavonoids [6+].

Quercetin Side Effects & Safety

Quercetin is generally considered to be safe. However, proper safety trials are lacking [11].

The side effects mentioned below were observed in animal or cellular studies. More clinical studies would need to determine the side effects of quercetin in different formulations and doses.

Side Effects

Brain cells

Quercetin was toxic to rat brain cells. Higher concentrations caused more brain cells to die [104].

It’s uncertain how cellular effects and doses could translate to humans.

Homocysteine Levels

In human liver cancer cells, quercetin significantly increased homocysteine levels [105].

The same effect has not been observed in clinical trials.

Thyroid Function

High doses of quercetin and other flavonoids acted as thyroid disruptors in animal studies. People with thyroid problems should use caution [106].

Children and Pregnant Women

Quercetin is likely safe if taken through a diet of healthy quercetin-rich foods in small amounts during pregnancy and childhood.

Children and pregnant women should avoid quercetin supplements due to a lack of safety data.

Quercetin reduced fertility in female mice in one study [107, 108].

Drug Interactions

It’s unknown how quercetin interacts with drugs in humans.

In cells, quercetin blocks the following CYP enzymes [6+]:

It also blocks a drug transporter in the gut (pgp) that helps eliminate many drugs from the body.

It’s possible that Quercetin can affect the levels of commonly used drugs that are eliminated through these pathways, although no clinical studies have confirmed this.

Rutin may also reduce the effects of warfarin, so caution is advised for people on this anticoagulant.

COMT Expression

COMT, the worrier or warrior gene, helps with methylation and also breaks down important neurotransmitters [109].

People with SNPs that predispose them to low COMT levels might want to avoid Quercetin since it has a catechol structure and can block COMT gene expression [110].

Dietary Sources & Supplements


Quercetin is found in a large number of foods. How the food was grown and transported will impact the concentrations of Quercetin. It’s possible that organic food is higher in Quercetin. In one study, organically-grown onions were higher in Quercetin and other flavonoids [111].

Food sources of quercetin include [3]:

  • Vegetables such as capers (highest concentration), onions, eggplant, celery, asparagus
  • fruits, especially berries, but also apples and oranges
  • Nuts
  • Black and green tea

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About the Author

Puya Yazdi

Dr. Puya Yazdi is a physician-scientist with 14+ years of experience in clinical medicine, life sciences, biotechnology, and nutraceuticals.
As a physician-scientist with expertise in genomics, biotechnology, and nutraceuticals, he has made it his mission to bring precision medicine to the bedside and help transform healthcare in the 21st century.He received his undergraduate education at the University of California at Irvine, a Medical Doctorate from the University of Southern California, and was a Resident Physician at Stanford University. He then proceeded to serve as a Clinical Fellow of The California Institute of Regenerative Medicine at The University of California at Irvine, where he conducted research of stem cells, epigenetics, and genomics. He was also a Medical Director for Cyvex Nutrition before serving as president of Systomic Health, a biotechnology consulting agency, where he served as an expert on genomics and other high-throughput technologies. His previous clients include Allergan, Caladrius Biosciences, and Omega Protein. He has a history of peer-reviewed publications, intellectual property discoveries (patents, etc.), clinical trial design, and a thorough knowledge of the regulatory landscape in biotechnology.He is leading our entire scientific and medical team in order to ensure accuracy and scientific validity of our content and products.

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