- What is zinc? Zinc is an essential mineral, one of the few nutrients for which a mild deficiency is not uncommon (see What It Is). Zinc is naturally found in meats and other foods (see Getting Zinc — From Food)
- Who is most likely to be zinc deficient? Mild zinc deficiency can occur with the use of acid-blocking medications and certain blood pressure medications. Zinc deficiency can also occur with hypothyroidism. Vegetarians may require as much as 50% more of the daily requirement for zinc due to compounds in legumes and grains that can interfere with zinc absorption (See What to Consider When Using).
- What are the benefits of zinc? Zinc supplements (typically taken in pill form) can reverse or prevent zinc deficiency (which can otherwise impair the immune system, cause diarrhea and hair loss, reduce taste, etc.) and help slow advanced macular degeneration of the retina. Zinc is also taken as a lozenge (or other orally dissolving formulation) to act locally on the throat to reduce the duration of a cold. (See What It Does).
- COVID-19 UPDATE: Zinc deficiency has been associated with more severe disease and higher mortality rates in people with COVID-19. However, there is no evidence that supplementing with zinc helps prevent COVID-19 and there is only extremely limited evidence that zinc lozenges are helpful. See the COVID-19 section for details.
- How much zinc should you take and which form of zinc is best? The daily requirement for zinc ranges from 3 mg for children to 14 mg for lactating women (see Dosage). No form is absorbed particularly better than another and zinc gluconate is typically the least expensive. To reduce the duration of a cold, take a lozenge (or other orally dissolving formulation providing 9 to 23 mg of zinc as either zinc gluconate or zinc acetate) every 2 to 3 hours during the day, allowing it to fully dissolve in the mouth: Limit treatment to one week as intake of large doses of zinc (see upper intake levels) can reduce copper absorption and eventually lead to copper deficiency that can impair the immune system.
- What is the best zinc supplement or lozenge? Among supplements that passed testing, we identified our Top Picks for pills and lozenges, as well as dissolving tablets, and liquids. We found that you can pay as little as 1 cent or more than $1 to get an equivalent dose of high quality zinc — there is no need to overspend.
- Cautions when taking zinc: As noted above, unless treating zinc deficiency, don't take large doses (more than 40 mg) of zinc daily for more than a week and don't take with fiber, which inhibits absorption of zinc. Be aware of drug interactions with zinc, particularly for certain antibiotics. (See Concerns and Cautions for more information about zinc side effects, interactions, and safety).
Zinc Supplements and Lozenges Review
Find the Best Zinc Supplements and Lozenges. Have a Cold? See CL's Top Picks Among Zinc Supplements and Lozenges.
Zinc supplements and lozenges compared in this review
Carlson Zinc Ease - Natural Lemon Flavor
Cold-Eeze - Cherry
Country Life Zinc Lozenges - Cherry Flavor
Frunutta Zinc + Vitamin C
Garden of Life Vitamin Code Raw Zinc
Good State Natural Ionic Zinc
Life Extension Zinc Caps 50 mg
Mary Ruth's Liquid Ionic Zinc - Unflavored
Nature's Bounty Zinc 50 mg
Nature's Way Zinc Lozenges - Wild Berry Flavored
NOW L-OptiZinc 30 mg
Sundown Essential Zinc 50 mg
Swanson Zinc Gluconate
Thorne Zinc Picolinate 30 mg
Vitacost Chelated Zinc Albion Zinc Glycinate Chelate
Vitamin Shoppe Zinc 50 mg
Walgreens Zinc Lozenges - Cherry Flavor
Zicam Cold Remedy - Citrus Flavor
- Which zinc supplements and lozenges passed testing, which failed
- ConsumerLab's Top Picks for zinc supplements and lozenges based on quality, the forms of zinc they provide, and value
- Which zinc lozenges provide a dosage known to work -- and which do not
- What zinc can and cannot do for your health
- If certain forms of zinc, like zinc gluconate, zinc acetate, and zinc citrate are better absorbed than others
- The zinc dosage to treat conditions including colds, macular degeneration, and zinc deficiency
- What the "zinc challenge" is and whether or not it is a reliable method for determining zinc deficiency or adequacy
- The potential side-effects of zinc and other concerns with zinc, including drug interactions
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