(1) Antibacterial effect studies have shown that carnosic acid has varying degrees of inhibition on Staphylococcus aureus, E. coli, Bacillus subtilis and Hansenula yeast, and can be used as a food preservative. (2) Antioxidant effect Carnosic acid has a good free radical scavenging and antioxidant effect. Its DPPH, ABTS free radical scavenging ability and iron-reducing antioxidant capacity are stronger than VE and slightly weaker than synthetic antioxidant TBHQ; its reducing ability is stronger than VE and TBHQ. Carnosic acid is fat-soluble, which can effectively inhibit the formation of peroxides and the decomposition of polyene fatty acids, thereby prolonging the shelf life of oils. In addition, studies have found that carnosic acid can effectively scavenge oxygen free radicals in mouse liver cells and reduce the production of lipid peroxides, thereby stabilizing the cell membrane; carnosic acid can also inhibit the oxidation of low-density lipoprotein, which can effectively prevent The occurrence of atherosclerosis. (3) Other studies have found that carnosic acid can inhibit the proliferation of HL-60 cells, and it is expected to become a new drug for the treatment of hematological malignancies, used for the treatment of cardiovascular diseases and anti-cancer. Kaloustian and others introduced that rosemary extracts such as carnosic acid have a certain therapeutic effect on heart disease and respiratory diseases, have antibacterial effect, and can also inhibit HIV infection. Ninomiya et al reported that rosemary extracts such as carnosic acid, in addition to effectively regulating the absorption of fat to control the weight of people, in order to achieve the purpose of weight loss, it can also treat inflammation, treat throat pain, treat indigestion, and prevent old age Dementia, treating diabetes, and promoting nerve growth factor production.