Hair Thinning/Hair Loss Question.?

I am only 21 and my hair is beginning to thin and I've got a little bit of a receding hair line. I definetly believe there are ways to regrow the thin spots back out until it is thick and nice again. I've found some ways so far and one of the ways is to mage the hair and scalp with aloe vera gel or coconut milk for 15-20 minutes after you bath with water, then rinse with warm water. Now I tried to get some 100% aloe vera gel at my health food store where I work, but most of the gels had additives in the product. For the recipe, it only said "aloe vera gel", and nothing more. Im not sure what kind to get and im not sure what additives should be avoided in order to REALLY improve hair regrow instead of making it worse. In some of the aloe vera gels was a citric acid as a preservitive and I wasnt sure if the citric acid would thin hair even more. Can someone with experience in this kind of thing please give me some advice? Thanks.