Not harmful, depends: Biotin is very safe; there is no known toxic dose. Biotin combined with 600 mcg of chromium picolinate significantly reduces blood sugar in those with type 2 diabetes, but if you don't have diabetes you may not have any particular benefits. See http://lpi.Oregonstate.Edu/infocenter/vitamins/biotin/.
Answered 11/27/2017
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