Long term chemo side effects

My oncologist checked my iron and vitamin D levels before I started chemo. Like a surprising number of women, my Vitamin D level was much too low. May be an unintentional side effect of slip, slop, slap - I burn easily and stay out of the sun. I had to get my level up before starting chemo (iron was fine). I still take a supplement, especially in winter which may assist with bone thinning (Letrozole side effect). It’s worth getting these things checked occasionally as it’s easy to blame treatment for everything and it may be something that’s easily fixed.