Form Comparison

Zinc Citrate vs Zinc Gluconate

Q: What is the difference between Zinc Citrate and Zinc Gluconate?

Both have high absorption and low cost. Choose zinc citrate when you want gluconate-level absorption with a smaller tablet; choose zinc gluconate when you want a well-studied, cheap, well-absorbed salt.

How zinc citrate and zinc gluconate differ in elemental content, absorption, tolerance, and cost.

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Quick verdict. Absorption is the same: Wegmuller 2014 measured equal fractional absorption for citrate and gluconate, both better than oxide. Citrate is denser (31% vs 14% zinc), so tablets are smaller, and it tastes less metallic. Choose gluconate for cold lozenges and citrate for everyday supplementation in a smaller tablet.

Side by Side

	Zinc Citrate	Zinc Gluconate
Elemental content	31% elemental zinc	14.3% elemental zinc
Absorption	High	High
How it is absorbed	Ionic zinc from a soluble organic salt. Absorbed as well as gluconate and better than oxide in Wegmuller 2014.	Soluble salt releasing ionic zinc, absorbed in the small intestine via ZIP4 transporters. Fractional absorption matched zinc citrate and exceeded oxide in Wegmuller 2014.
Typical dose	15-30 mg elemental zinc daily	15-30 mg elemental zinc daily
Common uses	general supplementation, toothpaste and oral care	general supplementation, cold lozenges
Side effects	Nausea on an empty stomach.	Nausea on an empty stomach.
Cost	Low	Low
Also called	None	None
Labels in index	423	476

When to Choose Zinc Citrate

Choose zinc citrate when you want gluconate-level absorption with a smaller tablet. Higher elemental content and less metallic taste than gluconate.

Zinc Citrate

Absorbed as well as gluconate in a direct comparison, with twice the zinc per milligram of compound and less metallic taste.

What to look for: 15-25 mg elemental zinc per serving. Add 1-2 mg copper for long-term use above 25 mg.

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When to Choose Zinc Gluconate

Choose zinc gluconate when you want a well-studied, cheap, well-absorbed salt. One of the two salts used in cold lozenge trials.

Zinc Gluconate

Choose zinc gluconate when you want a well-studied, cheap, well-absorbed salt.

What to look for: Zinc Gluconate named on the Supplement Facts panel, with the amount per serving stated.

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Products on Titrate

In Titrate's index of NIH label data, 423 labels named as zinc products list zinc citrate and 476 list zinc gluconate.

Open supplement search

Zinc does not have its own search category yet. Each product above links to its full label in the NIH database.

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.