1)Zinc Sulfate Heptahydrate Food Grade 2)Zn :22.8%,22.51% Min 3)ZnSO4:98%,99 ... %Min 4)Appearance:White crystal powder,granular Food Grade Zinc Sulfate Heptahydrate 1) Physical and chemical property:Molecular formula ... :1.High purity, easy soluble, quick absorbable for human body.2.Low content of heavy metal, Pb, Cd, Hg, Cr ... sealed package. Stay away from oxide Zinc Sulfate Heptahydrate Food Grade