What are the best vitamins to help promote healthy hair growth?

I am looking to grow out my hair.What are the best vitamins to help promote healthy hair growth?
Prenatal vitamins work good because they have a lot of carotene and good oils and fats in them. They can be a little expensive sometimes though and it may be cheaper to just buy a supplement specific to hair growth.What are the best vitamins to help promote healthy hair growth?
NOT IRON -- that's the only supplement that has caused death in young and old people.


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simply use coconut oil (take a spoonful 3 times a day) and


apple cider vinegar(take a spoonful 3 times a day diluted in distilled water or juice).


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this is perfect for anyone, including for a new life on the way...


(apple cider vinegar has more good effects than almost anything else!)
I've had some friends swear that prenatal vitamins did wonders for their skin, nails, and hair.
Iron