Collagen is made with fresh porcine and ox skin ,fish scales,chicken skin and bone. Specification : Properties:The product is ... :(%)(II) ≥18PH value :(I, II) 6.0—7.0Water content (%)(I, II) ≤5Cr (mg/kg):(I, II) ≤1.0As :(I,II) Must not be ... outPb (mg/kg):(I, II)≤1.0Coliform (1/100g):(I,II)≤100Total bacterial content (1/100g):(I, II) ≤500Salmonella:(I,II)Must not be ...