I don't know the remainder, but it relies on the idea some grey hair is due to nutritional factors and this is supposed to supply what the body needs to stop grey hair. A few people have reported hair going dark again after a few different supplements, but normally medical opinion would say it's genetic and leave it to nature or use dye, but something natural like that won't do any harm to try if you can find it. The healt food magazines in health food shops would know the formula I expect.