I've recently changed the brand of Vit D3 I take (I was on holiday when I ran out and bought what they had in the Aussie chemist, no other reason), and the pain in my Achilles has returned to the extent I'm practically limping, and going for a short run leaves me in agony for days. (I haven't been like that since last year, before I started taking Vit D and while my prev GP was refusing to prescribe levo because I "was cured and didn't need it any more"). At about the same time my levo brand was changed - I'd been on 75 mcg made up of a 25 plus a 50, then taking 50 plus 2x25 or 2 x50 to finish off what I had left when my GP increased my dose to 100 after my last blood test. I'm now dispensed 100mcg of a different brand.
What do you think - is it the change in levo, the change in Vit D or a bit of both? I can do something about the D3 myself, but if it's the levo.....