Ergosterol peroxide exhibits anti-cancer, amoebicidal, anticomplementary, antibacterial, antiviral, anti-oxdiant, and anti-melanogenic activities. Ergosterol peroxide could as an anti-atherosclerosis agent, it exhibits hACAT-1 and Lp-PLA2 inhibitory effects, with inhibitory values of 51.6 +/- 0.9 and 51.7 +/- 1.2%, at a treatment concentration of 0.23 mM. Ergosterol peroxide has osteoclastogenesis inhibitory effect, it shows an inhibitory effect in a dose-dependent manner and an inhibition rate of up to 62% with low cytotoxicity, even at a concentration as low as 1.0 microg/mL.