Silymarin jẹ iru awọn agbo ogun lignans flavonoid ti a fa jade lati inu awọn ẹwu irugbin ti idapọ oogun Silybum marianum, ofeefee tabi lulú brown, kikoro ni itọwo.Soluble ni Acetone, Ethyl Acetate, Ethanol ati Methanol, Ko ṣee ṣe tiotuka ninu chloroform, ti ko ṣee ṣe ninu omi.Awọn eroja akọkọ jẹ: Silybin, Isosilybin, Silydianin, Silychristin, ati bẹbẹ lọ.