Properties: soluble in water (40%, 35 ℃), water solution is neutral to slightly acidic. It is stable when the relative humidity is below 60%, and dihydrate is formed when the relative humidity is above 60%. If the body lacks lysine, it will cause protein metabolism disorders and dysfunction, leading to growth disorders. Because lysine is easy to absorb moisture, it is often made into hydrochloride. 1 g L-lysine is equivalent to 1.25 g L-lysine hydrochloride. It is usually stable, easy to caking and slightly colored under high humidity. This product is white crystal or crystalline powder; Odorless. The nutritional requirements of lysine are higher in the development period, recovery period after illness and pregnancy and lactation period of children. Under alkaline condition and in the presence of reducing sugar, it decomposes when heated. It melts and decomposes at 263-264 ℃. Bitter and sweet.

Lysine is listed as the "first deficient" amino acid in nutrition, which is particularly important among the eight essential amino acids for maintaining nitrogen balance in human body. With vitamin C and vitamin K: coexistence is coloring.