The product occurs as a dark brown or grey green powder. It is soluble in water and practically insoluble in acetone and in ethano. It is an iron(Ⅱ) amino acid chelate. Ingredient : Ferrous bisglycinate CAS No. : 20150-34-9 Molecular Formula : C4H8FEN2O4 Molecular Weight : 203.98 Quality Standard: https://www.richen-nutritional.com/ferrous-bisglycinate-food-grade-for-health-supplements-product/