Biotin In GlycoAid

The Research Behind Biotin

Biotin's role in metabolism is settled biochemistry. What is not established is any meaningful effect from supplementing it in people who are not deficient — including for the hair and nail claims it is most heavily marketed for, where the evidence is weak outside genuine deficiency.

What Dose The Studies Actually Used

The adequate intake for adults is around 30 micrograms a day, which most ordinary diets meet comfortably. Supplements frequently contain hundreds or thousands of times that figure, and the reason for those doses is marketing rather than requirement.

Biotin: Cautions Worth Knowing

This is the most practically important warning on this entire site, and it has nothing to do with toxicity. Biotin interferes with a large number of laboratory immunoassays, because those tests use a biotin-streptavidin binding system in their chemistry. High circulating biotin can push results falsely high or falsely low depending on the test design. Thyroid panels and cardiac troponin are the two that matter most, and the FDA has issued safety communications about it after a real case in which a falsely low troponin contributed to a missed heart attack. Biotin does not harm you. It can distort a test that someone is using to decide something important, so tell whoever takes your blood that you are on it.

What Biotin Is Not

Biotin, vitamin B7 and vitamin H are all the same thing. The high-dose hair and nail products sold at 5,000 or 10,000 micrograms are the same vitamin at hundreds of times the requirement, and they are also the products most likely to cause the test interference described above.

Finding Biotin Outside A Capsule

Eggs, almonds, sunflower seeds, salmon, sweet potato and liver all supply it, and the adequate intake is small enough that deficiency is rare on any reasonable diet. On a label, the thing worth noticing is the size of the dose. Hair and nail products routinely carry hundreds of times the requirement, and those are precisely the products most likely to interfere with a laboratory test.