Ooooh also - important to say that in terms of bone growth progesterone is the one. Estrogen moderates the osteoclasts 'bone clearers' but progesterone stimulates the bome builders 'osteoblasts.
Dr. Shirley Bond, a Harley St hormone health specialist says this about osteoporosis...
Bone mass loss starts in most women by the time they reach age 40, due to a drop-off in progesterone production. If a woman isn’t ovulating, then she’s not producing progesterone – and progesterone stimulates osteoblast cells which build new bone. “Progesterone certainly does build new bone. There’s no doubt about it,” says Dr Bond. “Giving progesterone cream almost invariably increases bone mass density. But there’s no point in checking for increased bone mass density on an x-ray or ultrasound, because it won’t show up immediately. You have to wait a year. You can check after three months with a deoxypyridinoline (DPD) test, which is a urine test that tells you if bone is being lost. If progesterone doesn’t reverse bone loss, then something else is going on.”