... ,SAFE,STABLE 5. FOOD GRADE 1.SourceGrape skin extract is extracted from grape skin which cultivated with lower pesticide.2. Product Characteristicsa ... → Purification → Concentration in Vacuum → Killing of Bacteria → Drying → Powder Liquid Grape Seed Extract Grape Skin Extract (Anthocyanidins, Polyphenols, Proanthocyanidins)