I have been taking Vit D3 1000 UI daily since I broke my wrist in 3 places 7 years ago ; in hindsight should have been tested prior ,Yes I was diagnosed then with osteoporosis and osteopenia , even the GP was surprised as I walk a lot. I am glad I insisted to have a bone density test . The surgeon suggested for my Hubby to take D3 as well , living above the 49 th parallel !!
As others mentioned some cancers , muscle pain and weakness , MS , diabetes are linked . I have read too that depression, high blood pressure , heart disease , anxiety ...it's complex !
Brian, i am aware of this and this is why I am considering going to an endocrinologist.