Re: vitamin d3 NOT from lanolin - what brands worked for you??
I don't think I have the kind of in depth information you seek. My understanding is that calcium may affect iron absorption but, it seems, only a very low effect at that. From what you describe, it sounds like you may have an iron deficiency but whether it is due to your supplements or something else may be moot. I think it would depend on how much calcium and such you are taking. Personally, I think many people take too much calcium (and not enough magnesium). Too much calcium can overload the kidneys and cause heart and other problems. But why not have your ferritin levels checked. If you're low, Floradix is a very safe, gentle product that you can purchase at a HFS.
All the best with this,