I certainly can't verify the suggestion from Hossam, but i can tell you for sure that what you eat and how you live your life greatly influences your hair growth in terms of thickness, density, speed of growth, beard, body, head hair, the lot. Obviously it is about maximising what you have been given and some of us are given alot, some not much!!! I've been both very sick and very healthy. Night and day regards beard and head hair health, thickness etc.