2 Inhibin Inhibin has a strong direct effect on the anterior pituitary gland in inhibiting FSH secretion and a light effect on the hypothalamus in inhibiting GnRH secretion. These automatic feedback mechanisms can maintain a normal speed of spermatiogenesis,which is required for male reproduction function.2 Inhibin Inhibin has a strong direct effect on the anterior pituitary gland in inhibiting FSH secretion and a light effect on the hypothalamus in inhibiting GnRH secretion. These automatic feedback mechanisms can maintain a normal speed of spermatiogenesis, which is required for male reproduction function