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NOW Foods L-Lysine 500mg Supplement for Immune Support homemade dog treats Step 2: Perfect for useDescription Essential Amino AcidSupports Collagen SynthesisHealthy Immune FunctionNon GMOA Dietary SupplementVegetarian VeganKosherAmino AcidsFamily Owned Since 1968GMP Quality AssuredNow L Lysine is a pharmaceutical grade essential amino acid. Lysine is an essential amino acid that must be obtained through the diet or through supplementation. Lysine is necessary for the production of all proteins in the body, and is required for the maintenance of