what supplement has helped your hair grow?

i know there are plenty of different supplements they say will make your hair grow fast. i’m stuck between hair skin and nails vits & biotin mostly. what do you think? i know prenatals help as well but idk if it would work best. i took prenatals while pregnant and i can’t say my hair grew like crazy compared to normal. anything else you have tried that works wonders? let me know!