... supply ability 4.Free from black impurities Food Grade MSM(Methyl Sulfonyl Methane)Specification:20-40mesh ... temperature flux, analytical reagent, chromatogram fixing agent ,food additive and health care products & medicine, which ... skin, hair & nail. It can strengthen blood circulation, help hair and nail grow, remove toxin ... avoid moisture, fire and insolation Food Grade MSM(Methyl Sulfonyl Methane)