What Are Progestin-Only Pills?

Natural progestogens are mainly secreted by the corpus luteum. After 3 to 4 months of pregnancy, the corpus luteum gradually shrinks and is replaced by placental secretions until delivery. There is also a certain amount of progesterone produced in the near-ovulation ovary and adrenal cortex. The natural progestin isolated from the corpus luteum is low in progesterone (progesterone). The clinically used progestin drugs are synthetic products and their derivatives.