Lately I have been doing research on biotin since I have been taking 10 mg of it since November. The only thing I found was that it helps to strengthen and thicken nails by 25% (which I noticed), but nothing about hair growth. It did say that it helps with cradle cap in babies and that a biotin deficiency can cause hair loss (but so can iron deficiency). I kind of suspected something was up because my hair didn't seem to be growing any faster than usual but my nails look great . Anyone else noticing this? Here's a link about it http://www.doctorsa-z.com/DAZ_Encyc/Biotin.html. If you do a search on biotin studies you'll see there is only stuff about nails but nothing conclusive on hair, if anything at all.