I haven't seen or tried nigari. I noticed a few people on the magnesium oil forum use it, though. Some say it might contain lead. The mag oil I bought (Natural Calm brand) works fine. I put it all over including underarms and feet. I add 20-30 drops to water and drink 3 times a day, too. Magnesium activates B vits and zinc. Very important mineral. Mag is involved in 300+ enzyme and detox pathways. I want to use it instead of Odor Cleanse if I can. Cheaper.