Spermidine is a naturally occurring polyamine found in all living cells. It plays a crucial role in cellular functions, including cell growth, proliferation, and survival. Spermidine is present in various foods, such as soybeans, cheese, and whole grains, making it accessible through a balanced diet. Research suggests that spermidine may have potential health benefits, including promoting autophagy, a process that helps cells remove damaged components. Some studies indicate that spermidine could contribute to longevity and improve overall health, although more research is needed to fully understand its effects on human health.