Research has shown that natural progesterone helps to slow down breast tumor growth. In the future, progesterone may be given along with tamoxifen as standard treatment for hormone receptor positive breast cancer. I have been a big advocate of bio-identical progesterone for many years. I've seen it work wonders for improving hormonal health and quality of life for countless women. Progesterone deficiency is a modern day epidemic and places women at higher risk of suffering with PMS, painful and heavy menstrual bleeding, endometriosis and uterine fibroids. Long term progesterone deficiency may raise the risk of breast and uterine cancer. It is wonderful to see mainstream medicine giving this wonderful hormone some attention. This new research was conducted in animals, but the results witnessed have given scientists great hopes for saving human lives in the near future. Around the world almost 1.7 million women are diagnosed with breast cancer each year. Current treatments help most women to survive for longer but still far too many women die far too young from this disease. I will be keeping a close eye on future progesterone research. Reference