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Special Offer Food Grade Additive CAS 51446-62-9 Phosphatidylserine Powder. Food Grade Standard: Certified food-grade phosphatidylserine powder. Natural Resource: Derived from natural sources for pure ingredients. Flexible Supply: Available in spot stock or customized production. Long Shelf Life: 24 months shelf life when stored properly. Secure Packaging: Aluminum foil bag with PE inner bag protection.