Biotin is a B-complex vitamin (B-7) and I've always been told that it's best to take B vitamins in the morning or sometime during the day. I take mine in the late morning as I take a multi at night, and I like to spread the vitamin intake throughout the day. That's just me, though.
I think that the amount you're taking is fine, but be on the lookout for skin issues or mood changes and adjust accordingly. If you take any sort of medication, read about any possible interactions.
Here is a good link -
http://www.nlm.nih.gov/medlineplus/d...nt-biotin.html
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