<prompt> Progesterone is added to estrogens in H to achieve wof effectsDecrease the estrogen action on the breastDecrease the occurrence of endometrial cancersIncrease the effectiveness of the estrogensInhibit bone resorption  <response>: Hormone replacement therapy H In nonhysterectomised postmenopausal women estrogen therapy is supplemented with a progestin for 10-12 days each month to counteract the risk of inducing endometrial carcinoma. Ref:- kd tripathi; pg num:-318 