| Zinc acetate |
An acetate salt of zinc that readily releases free zinc ions. One of the most extensively studied forms used in zinc lozenges and widely investigated in research on the common cold. |
| Zinc gluconate |
One of the most common over-the-counter forms. Reasonably well tolerated but less well absorbed than zinc acetate. |
| Zinc picolinate |
Chelated with picolinic acid. Studies suggest it is well absorbed and is commonly used where systemic zinc supplementation is required. |
| Zinc citrate |
Commonly used in supplements and oral healthcare products. Generally well absorbed, though less frequently studied in lozenge formulations than zinc acetate. |
| Zinc sulphate |
An inexpensive inorganic zinc salt. Water soluble but may be associated with gastrointestinal discomfort in some individuals. |
| Zinc oxide |
An inorganic form most commonly used in topical creams. When taken orally, its absorption is generally lower than that of several organic zinc salts. |
