Spermidine is a naturally occurring polyamine found in all living cells. It plays a crucial role in cellular functions, including cell growth, proliferation, and differentiation. Spermidine is present in various foods, such as soybeans, cheese, and whole grains, and is also produced by the body. Research suggests that spermidine may have potential health benefits, including promoting longevity and supporting cellular autophagy, a process that helps remove damaged cells. Studies have indicated that higher levels of spermidine in the diet could be linked to improved cardiovascular health and reduced age-related diseases.