In a USA three year study* of post-menopausal osteoporosis patients, women using Natural Progesterone Cream actually increased bone density by an average of 8% in the first year, by 4% in the second year and 2% in subsequent years, against the USA national average of 1.5% annual loss.
*Lee Dr J Osteoporosis Reversal: Role of Progesterone InternatClinNutrRev 1990; 10:384-391