Vitamins for Hair Loss

It seems so many men suffer from hair loss. I know my husband has lost quite a lot of his hair. He is always looking for something that will remedy his hair loss. We didn't know that there were vitamins for hair loss. I was checking the Internet for information on hair loss and what he could do to prevent it or at least slow it down. I guess I was shocked to learn that hair loss can be caused by a vitamin deficiency. So I am researching to find out what would be best to help him with his hair loss.