Should i take biotin supplement before meal or after meal ?

Whenever convenient: To the best of my knowledge, biotin is equally well absorbed with or without food so it makes little if any difference when you take it- take when it's most convenient. See http://altmedicine.About.Com/cs/herbsvitaminsa1/a/biotin.Htm you might also be interested in reading http://www.Care2.Com/greenliving/12-natural-remedies-that-boost-hair-growth.Html though don't boost iron unless it's low.