I think most microbes leech minerals to form biofilms. It’s probably why your levels are low in the first place and probably the basis of Jorge’s comment. If you’re not deficient, I wouldn’t touch iron supplements, and even if you are I’d stick to food sources. Taking vitamin C with vegetables helps increase the poor bioavailability of iron in greens, for example. Low levels inside the normal range are probably beneficial, since iron accumulation is a big problem as you age, but obviously anaemia would be a problem that deserves attention.