You can also use Nigari. It is the same as the magnesium bath flakes but much cheaper. It is actually used to make tofu. I used to use magnesium oil and the magnesium bath flakes every day. It was so costly, though. I have been using Nigari for maybe the past 6 months. It has the same effects. Do a search for Nigari / magnesium chloride. I order mine online, but you could probably try an Asian specialty grocery store or maybe a health food store.