Zinc Oxide vs Zinc Picolinate
How zinc oxide and zinc picolinate differ in elemental content, absorption, tolerance, and cost.
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Side by Side
| Zinc Oxide | Zinc Picolinate | |
|---|---|---|
| Elemental content | 80% elemental zinc | 21% elemental zinc |
| Absorption | Moderate | High |
| How it is absorbed | Insoluble at neutral pH; requires gastric acid to dissolve. Lower fractional absorption than citrate or gluconate in Wegmuller 2014, and further reduced with acid suppression. | Zinc chelated to picolinic acid. One small 1987 trial found greater increases in hair, urine, and erythrocyte zinc than with citrate or gluconate; it has not been replicated at scale. |
| Typical dose | Found in multivitamins at 8-15 mg elemental zinc | 15-30 mg elemental zinc daily |
| Common uses | multivitamins, food fortification, AREDS formula (with copper) | general supplementation |
| Side effects | Fewer taste complaints; GI effects at high doses. | Nausea on an empty stomach. |
| Cost | Low | Moderate |
| Also called | None | None |
| Labels in index | 190 | 220 |
When to Choose Zinc Oxide
Choose zinc oxide when it comes in a multivitamin. For targeted supplementation a soluble salt absorbs better. Common in multivitamins because it is compact and cheap. The AREDS trial used 80 mg zinc as oxide plus 2 mg copper.
Zinc Oxide
Choose zinc oxide when it comes in a multivitamin. For targeted supplementation a soluble salt absorbs better.
What to look for: Zinc Oxide named on the Supplement Facts panel, with the amount per serving stated.
Find on iHerb Affiliate linkWhen to Choose Zinc Picolinate
Choose zinc picolinate when you prefer a chelate and accept a modest premium. Popular, but its advantage rests on limited data.
Zinc Picolinate
Popular on the strength of one 1987 study in 15 people. Probably fine; not proven better.
What to look for: The same elemental dose rules as any form. Do not pay a premium for the absorption claim.
Find on iHerb Affiliate linkProducts on Titrate
In Titrate's index of NIH label data, 190 labels named as zinc products list zinc oxide and 220 list zinc picolinate.
Zinc does not have its own search category yet. Each product above links to its full label in the NIH database.
Related
References
NIH Office of Dietary Supplements. Zinc: Fact Sheet for Health Professionals.
Barrie SA, et al. Comparative absorption of zinc picolinate, zinc citrate and zinc gluconate in humans. Agents Actions. 1987;21(1-2):223-228.
Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8. Arch Ophthalmol. 2001;119(10):1417-1436.
Willis MS, et al. Zinc-induced copper deficiency: a report of three cases initially recognized on bone marrow examination. Am J Clin Pathol. 2005;123(1):125-131.
Nations SP, et al. Denture cream: an unusual source of excess zinc, leading to hypocupremia and neurologic disease. Neurology. 2008;71(9):639-643.
Wegmüller R, et al. Zinc absorption by young adults from supplemental zinc citrate is comparable with that from zinc gluconate and higher than from zinc oxide. J Nutr. 2014;144(2):132-136.
Hemilä H. Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage. JRSM Open. 2017;8(5):2054270417694291.