well the ai sums it up this way:
"Progesterone is vital for bone health, working with estrogen to promote new bone formation by stimulating bone-building cells (osteoblasts), helping maintain bone density, and preparing the skeleton for pregnancy's calcium demands. While low levels during menopause can contribute to bone loss and joint issues, progesterone therapy (often with estrogen) can prevent osteoporosis, though the type matters—synthetic progestins like MPA can sometimes decrease bone density, while natural progesterone supports it"

Obviously, we have our best bone health when we are young when we have good supplies and balanced supplies of estrogen/progesterone.

Think of it as a balance, with balance your body and bones are healthier.