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Supplements BODY HANDBOOK
Supplements · §569
Zinc
Zinc is the supplement almost nobody who buys it needs, and almost nobody who needs it buys. Eat beef or oysters even semi-regularly and food already covers you; the pill is money for nothing. The people quietly running low are vegetarians, adults over 65, and anyone on years of stomach-acid medication. Close that gap and taste sharpens, skin steadies, colds run shorter. But take a big daily dose you don't need and, two years on, it can quietly strip your copper and damage nerves.
Do · Daily Evidence Emerging Chapter Supplements

The real question is whether you're in the small group that's short. Four groups run low: vegetarians and vegans, because plant zinc is locked in phytate that blocks a third to a half of it 1; adults over 65, where 30 to 45% run mildly deficient 2; anyone on long-term acid blockers like omeprazole, which strip the acid zinc needs; and people with bowel disease, celiac, or bariatric surgery. Everyone else eating meat weekly is covered.

The strongest evidence is about colds, and it isn't the daily pill. Zinc lozenges started within 24 hours of a sore throat cut a cold from seven days to four 34. The zinc has to dissolve in your mouth and coat the throat where the virus multiplies; a swallowed daily pill lands in the wrong place, so the winter prevention habit is the bit the evidence won't back.

The testosterone claim is real only if you're deficient. Severe restriction tanks testosterone, and repletion in low men brings it back 5. In men who start normal, extra zinc does nothing, and chasing it at 50 to 100 mg buys the copper problem below for no gain.

Inflammatory acne responds too: 30 mg a day roughly halves red-bump counts over two to three months 6, close behind the antibiotic dermatologists try first 7.

If you're in a low group, three decisions: form, dose, timing.

What repletion does, if you were low:

  • Weeks 2 to 4. Taste comes back, food gets interesting, appetite ticks up 10.
  • Weeks 4 to 8. Wounds close on schedule; inflammatory acne is visibly better 7.
  • Months and years. Fewer, milder colds for the marginal older adult 11; drifting systems settle.

If you weren't low, none of it happens; there was nothing to fix.

The fine print — when to skip it, and what people get wrong

"Oxide is fine, it's mostly zinc." The label milligrams don't absorb; oxide needs strong stomach acid and gives near-nothing on acid blockers. "Picolinate is better absorbed" rests on one 1987 study of fourteen people, never replicated 12.

Never put zinc in your nose — intranasal Zicam was pulled after 130-plus reports of permanent smell loss 13. Don't run above 40 mg/day for months without added copper 9. In pregnancy, stay within the prenatal's dose.

Chronic high-dose zinc blocks copper for months, and copper loss damages spinal nerves — cases of numb feet after years on 100-plus mg 14. Recovery is often incomplete.

References
  1. 1Foster M, Samman S (2015). Vegetarian diets across the lifecycle: impact on zinc intake and status. Advances in Food and Nutrition Research. link
  2. 2Wessells KR, Brown KH (2012). Estimating the global prevalence of zinc deficiency: results based on zinc availability in national food supplies and the prevalence of stunting. PLOS ONE. link
  3. 3Hemilä H, Petrus EJ, Fitzgerald JT, Prasad A (2016). Zinc acetate lozenges for treating the common cold: an individual patient data meta-analysis. British Journal of Clinical Pharmacology. link
  4. 4Singh M, Das RR (2013). Zinc for the common cold. Cochrane Database of Systematic Reviews. link
  5. 5Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ (1996). Zinc status and serum testosterone levels of healthy adults. Nutrition. link
  6. 6Cervantes J, Eber AE, Perper M, Nascimento VM, Nouri K, Keri JE (2018). The role of zinc in the treatment of acne: a review of the literature. Dermatologic Therapy. link
  7. 7Dreno B, Moyse D, Alirezai M, Amblard P, Auffret N, Beylot C et al. (2001). Multicenter randomized comparative double-blind controlled clinical trial of the safety and efficacy of zinc gluconate versus minocycline hydrochloride in the treatment of inflammatory acne vulgaris. Dermatology. link
  8. 8Wegmüller R, Tay F, Zeder C, Brnić M, Hurrell RF (2014). Zinc absorption by young adults from supplemental zinc citrate is comparable with that from zinc gluconate and higher than from zinc oxide. Journal of Nutrition. link
  9. 9Institute of Medicine (2001). Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. link
  10. 10Henkin RI, Schecter PJ, Friedewald WT, Demets DL, Raff M (1976). A double blind study of the effects of zinc sulfate on taste and smell dysfunction. American Journal of the Medical Sciences. link
  11. 11Prasad AS (2008). Zinc in human health: effect of zinc on immune cells. Molecular Medicine. link
  12. 12Barrie SA, Wright JV, Pizzorno JE, Kutter E, Barron PC (1987). Comparative absorption of zinc picolinate, zinc citrate and zinc gluconate in humans. Agents and Actions. link
  13. 13FDA (2009). Loss of sense of smell with intranasal cold remedies containing zinc. link
  14. 14Nations SP, Boyer PJ, Love LA, Burritt MF, Butz JA, Wolfe GI, Hynan LS, Reisch J, Trivedi JR (2008). Denture cream: an unusual source of excess zinc, leading to hypocupremia and neurologic disease. Neurology. link
Related in the handbook (7)
Works well with
  • — If your zinc runs low, a weekly portion of liver or kidney covers it cheaply without a separate supplement.
  • — Inflammatory acne genuinely responds to zinc — lesion counts drop about a third — making it a quiet add-on to topical acne actives.
Undermines
  • — Long-term acid-blockers cut zinc absorption, which is why PPI users are one of the at-risk groups.
  • — Push zinc past the ceiling for months and you slowly drain copper, which is how nerve damage shows up later.
Related
  • — Plant zinc is poorly absorbed largely because of phytic acid; traditional prep helps unlock it.
  • — Selenium and zinc work together on immunity and thyroid receptors — adequacy in both matters.
  • — The groups short on B12 — vegans, older adults, long-term acid-blocker users — are the same ones who quietly run low on zinc; check them together.
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