Hair Loss Product

My husband has been gradually losing his hair over the years and wishing there was something he could do about it. We have seen a number of products advertised on television but how do you know if they will work or not? How fast will they work? How effective is the hair loss product? We do not have the time or the money to buy them one at a time and find out they do not work and that we have thrown away our money. I thought there must be someone who has investigated these products and can give us some good advice. In checking the Internet, I found there are companies who have checked out the results with consumers who have used the products. They check out all the claims made by these products to see if they are true and also scientific studies. Then they are able to recommend the ones they feel live up to their claims. That is a huge help.