Is e, d & biotin the most effective vitiamins for healthy hair & supelment growth for hair ?

A good MultiVit: Taking a c d e is helpful. But most important are biotin and all the b vits and also iron and zinc. The key is to not overload on vits or supplements as that can be counter-productive and even dangerous.

Yes, however..: The best vitamins for hair growth are the ones that work for you, and what works for one person may not be best for another. Biotin is widely considered the best overall. E ; d are generally helpful because most people who don't supplement with them are deficient ; deficiencies can cause hair issues. But many others may help too- see http://bit.Ly/1axauwu.