Ingredient directory

The most common zinc salt in multivitamins, lozenges, and immune products, containing about 14.3% elemental zinc.

Typical: 10–25 mg

The organic selenium form found in Brazil nuts, grains, and selenium yeast, in which selenium replaces sulfur in the amino acid methionine.

Typical: 50–200 mcg

Zinc chelated with picolinic acid, a tryptophan metabolite that is proposed to aid mineral transport across the gut wall.

Typical: 10–25 mg

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 zinc salt of citric acid with a relatively high zinc content of about 31%, giving it a compactness advantage over gluconate and picolinate.

Typical: 10–25 mg

Copper chelated with two glycine molecules, supplying about 25% elemental copper in commercial grades.

Typical: 0.5–2 mg

The densest zinc source at about 80% elemental zinc, which is why it is the default in multivitamins and low-cost tablets where space is tight.

Typical: 10–25 mg

A copper salt of gluconic acid, about 14% elemental copper, and one of the most widely used copper sources in multivitamins because it is water soluble, inexpensive, and has a long safety record.

Typical: 0.5–2 mg

An inorganic selenium salt that is about 46% selenium by weight, inexpensive, and readily converted to selenide for selenoprotein synthesis.

Typical: 50–200 mcg

A complex of zinc with the amino acid L-methionine, best known under the OptiZinc trade name, carrying roughly 21% elemental zinc.

Typical: 10–25 mg