Norethindrone acetate (Standard) is the standard substance of Norethindrone acetate, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Norethindrone acetate (19-Norethindroneacetate) is an oestrogen with inhibitory effects on adolescent menstruation and hepatic adenomas and is often used in combination with progestins in the study of endometriosis.