Understanding the interactions, benefits, and safety of combining these two powerful supplements.
We found no direct interaction between Biotin and Calcium in the sources below, but they share a caution.
Both have a note about thyroid medicine or thyroid tests (see each one below).
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: The body's most abundant mineral; it builds bones and teeth and helps muscles, nerves and blood vessels work.
What the research says: Calcium supports bone health, especially when diet falls short. Vitamin D helps the body absorb it.
In Holitro: Calcium Citrate (160 mg per capsule)
Source: NIH Office of Dietary Supplements: Calcium: Fact Sheet for Consumers (updated September 2023)
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. Taking too much of one can blunt the absorption of the other.
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