Polylysine (Poly-lysine, abbreviated as ε-PL) is a natural biopolymer (polypeptide) composed of lysine monomers linked by peptide bonds. It is not a chemically synthesized substance but is produced through the fermentation of specific microorganisms (such as Streptomyces albulus), belonging to bioengineering technology products and is eco-friendly and safe.

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Gamma-aminobutyric acid(GABA),a small molecule consisting of only four carbon atoms and one amino group,is surprisingly widely distributed in bacteria,fungi,plants,and animals.Its discovery not only uncovered a key inhibitory neurotransmitter in the central nervous system but also laid a foundational basis for subsequent research into its roles in various physiological and pathological processes such as sleep,anxiety,and epilepsy.Today,as a naturally occurring active component,GABA has become one of the highly sought-after functional ingredients in the health sector[1].