http://www.drannagarrett.com/2015/07/conventional-hormone-therapies/
The best known examples of conventional HRT are Premarin and the combination drug, Prempro.
Prempro is a combination of synthetic estrogen and a synthetic progestin and is the product that was involved in the Women’s Health Initiative study that showed increased risk of breast cancer, blood clots and stroke with HRT.
The estrogens in the product are derived from the urine from pregnant mares, and the progestin is medroxyprogesterone, a synthetic hormone not found in nature. Other products that contain synthetic hormones include oral contraceptives and some IUDs. Some names of other synthetic progestins are norethindrone, drosperinone and levonorgestrel.
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