Zinc
MineralAlso known as: Zn · Zinc picolinate · Zinc glycinate · Zinc gluconate
An essential trace mineral involved in immune function, testosterone production, wound healing, and hundreds of enzymatic reactions. Deficiency is common, especially in athletes.
How expert claims hold up
28 of 64 claims assessed0 of 28 assessed claims supported or partially supported by published research
Evidence Summary
The available research on zinc supplementation spans a broad range of health outcomes, including immune function, reproductive health, blood sugar regulation, menstrual pain, wound healing, and sleep quality. The evidence base includes multiple meta-analyses and systematic reviews, which are generally the highest-quality study designs, alongside a smaller number of individual randomized controlled trials (RCTs) and narrative reviews. However, a critical limitation across this entire body of literature is that the specific findings, effect sizes, populations studied, and key conclusions from these studies were not provided in extractable detail, meaning definitive statements about zinc's efficacy for any particular outcome cannot be made with confidence from this dataset alone.
Read full evidence summary →Top studies
Effect of micronutrient supplements on influenza and other respiratory tract infections among adults: a systematic review and meta-analysis.
Effect of micronutrient supplements on influenza and other respiratory tract infections among adults: a systematic review and meta-analysis.
Efficacy of dietary supplements on improving sleep quality: a systematic review and meta-analysis.
Efficacy of dietary supplements on improving sleep quality: a systematic review and meta-analysis.
Expert Mentions
All 64 mentions"Long-term high-dose zinc supplementation without copper monitoring can deplete copper and create new problems."
Long-term high-dose zinc supplementation without copper monitoring can deplete copper and create new problems.
"high-dose zinc supplementation — above 40 milligrams per day long-term — can actually deplete copper because zinc and copper compete for absorption."
High-dose zinc supplementation above 40 milligrams per day long-term can deplete copper because zinc and copper compete for absorption.
None of the 10 provided studies directly investigate the relationship between high-dose zinc supplementation and copper depletion or zinc-copper competitive absorption. The retrieved literature covers topics such as dysmenorrhoea, ALS, pediatric micronutrient supplementation, immune function, prediabetes, diabetic foot ulcers, male infertility, and macular degeneration — none of which provide direct evidence for or against Huberman's specific claim about zinc doses above 40 mg/day inducing copper deficiency. While the zinc-copper absorption competition is a well-established physiological mechanism in the broader nutrition science literature, the specific studies provided here contain no key findings relevant to evaluating this claim.
Key findings
- ·Multiple meta-analyses examined zinc across diverse health areas — including immune function, dysmenorrhea (menstrual pain), male fertility, prediabetes, diabetic foot ulcers, and sleep — suggesting zinc is one of the more broadly studied dietary supplements.
- ·At least two separate meta-analyses specifically investigated zinc for primary dysmenorrhea, indicating a recognized area of scientific interest with enough trials to pool results.
- ·Zinc was studied as part of multivitamin/mineral combinations in older adults and in children under five in low- and middle-income countries, pointing to potential relevance across different life stages and nutritional contexts.
Evidence gaps
- ·Specific effect sizes, confidence intervals, and clinical significance of zinc supplementation across all studied outcomes are unknown from this dataset, making it impossible to determine whether any observed benefits are meaningful in practice.
- ·The populations, dosages, and supplementation durations used across these studies vary considerably and were not specified, leaving it unclear who might benefit most from zinc supplementation and at what dose.
- ·Long-term safety and efficacy data are not captured here; most supplementation trials tend to be short-term, and the consequences of extended zinc use — including risk of copper depletion — are not addressed in the available summaries.