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L-arginine(L arginine) is an amino acid commonly sold in supplement form and obtained naturally in the diet. L-arginine-rich foods include plant and animal proteins, such as dairy.

Natural arginine to L-type, the product crystallized from water containing two crystal water molecules, the crystallization in ethanol is anhydrous. Because the presence of guanidine, arginine is alkaline, easy to form a salt with the acid reaction.Natural materials abound in the protamine,it is the basic components of proteins, so there is very extensive.