Am on Letrozole too and stocked up with curcumin , fish / krill oil ( recommended by medical onc) , panadol osteo ( not keen on but suggested by pharmacist buddy) . I currently take Caltrate bone health with Magnesium ( lots of ladies on here recommend magnesium) twice daily and have for some years . I do a stretch and balance class twice weekly and tomorrow hope to start a 630am walking regimen ( ugh! but was explained nothing at that time crops up to prevent a walk).Thus far after 4 weeks noted joint stiffness if I sit for a while but ok if I get moving .I take heart though that many have said their body adapted after a few months. I did not have chemo either but as I am osteoporotic have Prolia injections 6 monthly which builds bones which may be helping too.