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Lysine is an essential amino acid that constitutes all proteins in the human body. It plays a crucial role in regulating metabolic balance, enhancing the absorption of cereal proteins, improving human dietary nutrition, and promoting growth and development. Since it cannot be synthesized by the human body itself and must be obtained from food, lysine is known as the "first essential amino acid", and it is closely related to the growth and development of children and adolescents. Animal experiments have found that lysine can enhance the immune function of mice.

Common foods such as beans, chicken, and eggs contain lysine. However, for children and adolescents during the growth and development period, their daily diet may not meet the requirements, so additional intake of lysine is recommended to ensure normal growth and development.

Lysine purification technology is difficult due to its small molecular weight and instability. The commonly available forms on the market are lysine hydrochloride salts. The salt form is easier to produce than lysine itself and can be mass-produced at a low cost.

Research has shown that in the body, lysine hydrochloride salts need to be digested, absorbed, and converted into lysine before they can be utilized by the body. After being decomposed by gastric acid and bile, lysine is released. Upon reaching the intestine, the absorption rate of lysine hydrochloride salts decomposed by intestinal villi and flora varies greatly among individuals, ranging from as low as 25% to as high as 40%.

Due to individual differences in intestinal flora, the final utilization rate of lysine hydrochloride salts varies greatly. Direct supplementation of lysine far exceeds the utilization of lysine hydrochloride salts. With the development of scientific research, the activity and stability of lysine are constantly being improved. Active lysine, based on lysine, changes its encapsulation technology to increase its activity, but it also brings the problem of poor stability. As the first major essential amino acid in the human body, lysine does not need to be decomposed by the digestive system and can be directly utilized by cells, thereby improving growth efficiency.