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What is Quercetin?

Quercetin is a plant flavonoid that is found in many foods including green tea, berries, onions, pepper, dark leafy greens, tomatoes, and citrus fruits. Like other plant flavonoids, quercetin supports immune health, reduces the risk of allergies and supports a healthy inflammation response[1]


Quercetin Benefits and Uses

Because quercetin has anti-oxidant properties and can scavenge free radicals, it reduces the oxidative stress on the body and supports healthy aging[2]. This can benefit the health of hair, skin, and nails.

Quercetin plays an important role in regulating the immune system[3]. It does so by regulating kinase and phosphatase signaling pathways; these are proteins which are essential for proper cellular function.

Clinical research has shown that quercetin supports respiratory health because of its antihistamine effect[4], which can alleviate symptoms such as a runny nose and watery eyes.

Quercetin has also been shown to support hair growth[5] by reducing PGD2, a prostaglandin which is linked to inhibited hair growth and hair loss.

Flavonoids such as quercetin support cardiovascular health by boosting blood circulation[6] and inhibiting cholesterol oxidation, thus preventing LDL cholesterol to adhere to the artery walls[7].

Quercetin Side Effects

Quercetin is generally considered safe at doses lower than 1 gram per day. Higher doses are reported to cause kidney complications. Side effects may include upset stomach and headache.

Quercetin may cause interactions with certain medications including:

  • Antibiotics: quercetin may reduce their effectiveness.
  • Anticoagulants: quercetin may increase the risk of bleeding.
  • Chemotherapy: quercetin may enhance the effects of the cancer medications cisplatin and doxorubicin.
  • Corticosteroids: quercetin may cause this medication to stay in the body longer than normal.
  • Cyclosporine: quercetin may interfere with the body’s absorption of this immunosuppressant medication.
  • Fluoroquinolones: quercetin may reduce the effectiveness of these antimicrobial drugs.

Quercetin Overdose

There are currently no reports of quercetin overdose or how much would constitute an overdose. If you feel you have taken too much quercetin, stop taking the supplement straight away and seek medical advice.

Buy Quercetin

HairOmega® DHT Blocker Original 33-Ingredient Formula without Biotin, B Vitamins and Iodine are natural hair growth pills. As well as quercetin they also contain natural DHT blockers saw palmetto and beta-sitosterol. 

DrFormulas™ Prostate Support Supplement | Saw Palmetto & Quercetin, 120 Capsules (Formerly Prostanew). Designed for optimal prostate support, this supplement contains 33 different ingredients to help regulate prostate function, promote a healthy inflammation response and provide essential prostate nutrients.

HairOmega® DHT Blocker Biotin 5000 mcg Vitamins for Hair Growth | Hair Loss Pills For Women and Men, 41 Ingredients, 45 Day Supply. Specially formulated with 41 ingredients to support healthy hair growth and DHT metabolism, Hairomega® DHT Blocker contains 5,000 mcg Biotin per serving, to benefit hair growth, strong nails, and healthy skin.

Like all DrFormulas™ supplements, these are made using the highest quality ingredients and contains no artificial flavors or colors. They are all made in an FDA inspected facility using Good Manufacturing Practices. Start taking DrFormulas™ supplements today, because you deserve the best.