How much Biotin is too much?

First of all, keep in mind that biotin is a substance that is produced naturally in your body. Therefore, when you take biotin, you are not introducing a foreign substance into your body. You are simply adding more of something it already makes. That being said, you might worry about having too much of a good thing. Here are a few things to look out for regarding biotin side effects:

it doesnt necessarily make your hair grow faster... it usually makes hair grow in thicker. one side effect that i know of from taking it is it can give you a lot of energy and make it difficult to sleep if you take it later in the day.