Although estrogen can slow the progression of bone loss, studies have shown that it is progesterone that is actually responsible for building new bones. Estrogen replacement alone may increase your risk of endometrial uterine and breast cancer as estrogen stimulates cell proliferation in uterine and breast tissue. Progesterone plays a balancing role with estrogen keeping this potentially harmful cell growth in check, helping to reduce the risk for uterine cancer. If you suffer from hormone related migraines it is most likely due to estrogen dominance. Estrogen causes dilation of the blood vessels which can be a contributing factor.
Progesterone helps to restore vascular tone, counteracting the dilation.
If you are a PMS sufferer, you may have a hormonal imbalance with estrogen being the dominant hormone. You can use natural Progesterone to help counter-balance this and alleviate some or all of the symptoms. We can no longer suggest androstenedione is suitable for aphrodisiac purposes for men. Although the resistance training did increase body mass and muscle strength significantly, these were independent of the androstenedione, which had no effect on the outcomes. A significant proportion of the ingested androstenedione was converted to estrogens.