Spermidine participates in many biological processes in the body, such as regulating cell proliferation, cell aging, organ development, immunity, cancer and other physiological and pathological processes. Recent studies have shown that spermidine plays an important regulatory role in processes such as synaptic plasticity, oxidative stress and autophagy in the nervous system.

Spermidine can delay protein aging. Because proteins of different molecular weights may play different roles in the aging process, some large molecular weight proteins may play a key role in controlling the aging process of leaves. Once these proteins begin to degrade, aging is inevitable, and controlling the degradation of these proteins can delay the aging process. The reason why spermidine can delay its aging may be that it promotes the synthesis of these proteins or prevents their degradation.