Ingredient directory

The most concentrated and least expensive common calcium salt, supplying about 40% elemental calcium by weight.

Typical: 250–600 mg

A calcium salt of citric acid that does not rely on stomach acid to dissolve, so it can be taken with or without food and is often chosen for older adults and people on acid-reducing medication.

Typical: 200–500 mg

Ferrous iron chelated with two glycine molecules, the form most prenatal and gentle-iron products now use.

Typical: 18–30 mg

The reference iron salt used in most clinical research and public-health programs, inexpensive and reliably absorbed.

Typical: 18–45 mg

The standard iodine source in multivitamins, prenatals, and thyroid-support formulas, about 76.5% iodine by weight and absorbed almost completely.

Typical: 150–300 mcg

Zinc chelated with two glycine molecules, sold as a gentle, well-absorbed form for people who get nausea from zinc salts.

Typical: 10–25 mg

A ferrous salt of fumaric acid that carries about 33% elemental iron, the highest of the common iron forms, which keeps tablets small.

Typical: 18–45 mg