I reckon this is completely untrue. If hair can keep growing after you're dead (which it can) then I don't think a supplement will have any effect on rate of growth.
there are vitamins that are good for your hair, and if your hair is in good condition you can get the maximum amount of hair growth out of it. hair grows at an adverage of 1/2 inch a month, if it is in goon condition, sometimes more, somtimes less. Any yellow fruit or vegetable has whatever it is that helps hair growth. so basically, eat bananas.
hiya try this herbal oil honestly it is fab i swear by this...........i hav had hair loss for 4 years pregnancy 3 kids yep .............its exellent its a family thing its fab yr hair will grow healthier with this and quicker...........i have tried supplements they havent seemed to do anything for me
here is the link
its fab stuff http://www.dabur.com/en/products/personal_care /hair_care/vatika/hairoil/default.asp