Why are there different forms of iron supplements?

Two things make the iron shelf genuinely interesting, and neither is the marketing. First: the ferrous salts differ mainly in elemental iron and gastrointestinal toll — readable arithmetic. Second: the dosing discovery — taking iron every other day can absorb more than daily doses, because the intestinal gate (hepcidin) slams shut after each dose and needs a day to reopen. A shelf that flipped its own advice inside a decade. This guided journey covers the salts, the gate, and the gentleness ladder.