2.5mg is ideal dose for Biotin for hairs.
are you sure ^? ive seen people consume it in the GRAMS daily range
I'm also interested in what is the ideal dosage of biotin for hair. At the moment I'm taking 5 mg twice daily. I suppose it's a bit too much. Perhaps 2 mg once a day is enough. There are time release versions but from I've read they yield no additional benefit and can be hard on liver.
Where have you got this information?