08/12/2026
A friend asked me last week which iron supplement was worth trying. Simple question, and the answer surprised her.
The standard iron most health care practitioners reach for is ferrous sulfate, 325 mg. That number is the weight of the whole tablet. The iron inside it is about 65 mg. It works, and it is cheap, and it is also the form most likely to leave someone constipated and nauseated.
A chelated form bonds the iron to glycine, an amino acid, instead of to an acid. One capsule carries 29 mg of iron, and the body absorbs a larger share of what is there while tolerating it much better.
Here is the part worth remembering. Most people who quit a mineral did not have a problem with the mineral. They had a problem with the form it came in.
Full piece on how this works, and why it applies to magnesium and zinc too: https://itsmy.health/same-mineral-different-result/
Stay curious and thrive, Dr. G