Understanding the interactions, benefits, and safety of combining these two powerful supplements.
We found no documented interaction between Biotin and Quercetin in the sources below. That isn't proof the combination is right for you: check each one's cautions, and ask your pharmacist if you take medication.
What it is: A B vitamin that helps turn the food you eat into energy.
What the research says: It's widely sold for hair, skin and nails, but there's little evidence for that. A few small studies found harder nails in people with brittle nails.
In Holitro: Biotin 5000mcg (5000 mcg per capsule)
Source: NIH Office of Dietary Supplements: Biotin: Fact Sheet for Consumers (updated January 2021)
What it is: A plant compound found in apples, onions and tea; the most common flavonoid in the diet.
What the research says: It hasn't been shown to treat any disease. Its anti-inflammatory effects come from lab studies; in athletes, any performance benefits were small.
In Holitro: Quercetin (500 mg per capsule)
Sources: Memorial Sloan Kettering Cancer Center, About Herbs: Quercetin (updated October 2023); NIH Office of Dietary Supplements: Dietary Supplements for Exercise and Athletic Performance (updated March 2021)
Check with your doctor or pharmacist, especially if you take medication.
Check your stack — freeEducational information only, not medical advice. This reflects general ingredient overlap, not a personalized safety review. Always check with your doctor or pharmacist before combining supplements, especially if you take medication, are pregnant or nursing, or manage a health condition. These statements have not been evaluated by the FDA.
Balancing dosages across multiple different bottles is risky, inefficient, and expensive. Quercetin is already lab-dosed and delivered daily in our Antioxidant Pack — one less bottle to manage.
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