Some cancers such as breast cancer. The incidence of breast cancer is 5.4 times greater in women with low progesterone levels. Women with low progesterone levels are 10 times as likely to die from all other forms of cancer. Cancer cells should be progesterone-positive for results. Menopausal symptoms Mental decline .
Progesterone increases brain cell energy while suppressing over-excitation.
Excitotoxicity is a primary cause of brain aging and degenerative neurological disease. Brain cells concentrate progesterone 20 times higher than blood serum. Fibrocystic Breast Disease. Estrogen causes cellular proliferation which left unchecked can lead to cancer. Nature's way of stopping the proliferation is with progesterone.