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There are no, or very few, cases of patients experiencing biotin
side effects. If you are using a biotin based supplement the likeliness to experience side effects from it are very, very small. Even is the dose is a bit higher than the recommended one, the biotin excess will just be eliminated by your body. However, in case of constant overdoses, over a longer period of time, you may notice skin rashes, or maybe high blood sugar levels. Acne
is not known as side effect of biotin. Take care.