Limonin is a accustomed admixture begin in grapefruit and added citrus seeds. Limonin is a triterpenoid aglycone that is a absinthian assumption of citrus fruits. It has been apparent to arrest chemically induced carcinogenesis and demonstrates anti feedant properties.

It has anti-proliferative, proapoptotic action on several blight corpuscle curve and inhibits azoxymethane-induced colon blight in rats. It aswell inhibits HIV-1 archetype in culturedf monocytes, macrophages, and mononuclear cells, conceivably by inhibition of HIV-1 protease activity.

Limonin may be acclimated in assays to quantify limonin in citrus products. It may aswell be acclimated in added assays as a control, standard, or adversary or in studies on the physiology, metabolism, and biosynthesis of limonin.