chelated iron
How to Read an Iron Supplement Label in Thirty Seconds
Every iron bottle looks the same from the front. Four lines on the back panel do not. Here is the thirty second test, and it works on our label too.
Chelated Iron and Iron Salts: Why Tolerance Differs
Two bottles both say iron. One says ferrous sulfate, the other ferrous bisglycinate. Here is what that word changes inside the gut, and why it matters.