Vitamins for hair

Su

My hair has been falling out quite a bit. I'm very stressed out so I blame some of it on that. But I also wanted to know what kinds of vitamin or mineral deficiencies can cause that as well. I was thinking about starting to take some but I don't like most multivitamins as most of the time they are full of sugar and additives. So I wanted to pin point what I might need and find a good pure version of it to take.