β -carotene can increase the activities of SOD and GSH-Px in red blood cells. β -carotene contains 8 isoprene monomers and many yoke double bonds, and is sensitive to peroxide free radicals. Physiology and medicine have proved that peroxide free radicals can accelerate human aging, which is called "garbage" of the body. However, the numerous * * * yoke double bonds in β -carotene can neutralize peroxide free radicals in vivo, thus greatly reducing (even interrupting) the incidence of lipid peroxidation chain reaction, greatly reducing MDA, cross-linking degree of biomolecules, lipofuscin and hydroxyproline in myocardial cells, thus enhancing memory, delaying aging and enhancing immune function.