Does biotin cause initial hair loss? If biotin aids in the production of amino acids, which themselves create keratin, it makes sense that a biotin deficiency can lead to hair breakage, thinning, and loss. Although biotin deficiency is rare, because it can be found in many foods, there are a few signs that you should be aware of (3).
How much biotin should I take if my hair is falling out? 2-5 milligrams
What are the negative effects of biotin? Biotin supplements can cause problems if you take too much. Side effects can include skin rashes, digestive upset, problems with insulin release, and kidney problems. As with any supplement, the safety of long-term or high-dose use isn’t known.