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Zinc
Involved in 300+ enzymatic reactions — supports immune defense, testosterone production, wound healing, and sleep quality.
What the evidence says
Zinc appears to help in 10 of 11 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1976–2026 with a typical study size of 739 participants.
Based on 631 studies · 103 meta-analyses · 474 RCTs · 486,979 total participants
Confidence
High confidenceWhat the studies found
By outcome
A Very Strong 8.5 reflects dozens of high-quality meta-analyses showing consistent benefits across dysmenorrhea, immunity, glycemic and lipid control, with deficiency well-documented and an excellent safety profile.
521 randomised trials
76% were about Zinc in an audit of 50 of them
Every randomised or controlled trial of Zinc indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Sep 2026
158 trials ongoing or recruiting · 722 completed on ClinicalTrials.gov
84 of the completed trials have posted results
Registered trials show research momentum for Zinc, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for Zinc meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
Authorised claims
“Zinc contributes to normal DNA synthesis”
“Zinc contributes to normal acid-base metabolism”
“Zinc contributes to normal carbohydrate metabolism”
“Zinc contributes to normal cognitive function”
“Zinc contributes to normal fertility and reproduction”
“Zinc contributes to normal macronutrient metabolism”
“Zinc contributes to normal metabolism of fatty acids”
“Zinc contributes to normal metabolism of vitamin A”
“Zinc contributes to normal protein synthesis”
“Zinc contributes to the maintenance of normal bones”
“Zinc contributes to the maintenance of normal hair”
“Zinc contributes to the maintenance of normal nails”
“Zinc contributes to the maintenance of normal skin”
“Zinc contributes to the maintenance of normal testosterone levels in the blood”
“Zinc contributes to the maintenance of normal vision”
“Zinc contributes to the normal function of the immune system”
“Zinc contributes to the protection of cells from oxidative stress”
“Zinc has a role in the process of cell division”
Not authorised by EFSA
“Zinc contributes to a healthy cardiovascular system”
“Zinc for a healthy prostate Zinc helps to maintain a healthy prostate”
“Zinc promotes joint health Zinc helps support the function of the joints”
“Zinc Without enough zinc in your diet, muscular performance will be impaired”
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
Zinc is an essential trace mineral involved in over 300 enzymatic reactions. It's crucial for immune function, protein synthesis, wound healing, and DNA synthesis. Deficiency is common, especially in athletes, vegetarians, and older adults.
Correcting low zinc raised testosterone in one small study of older men, zinc lozenges may shorten colds, and it is also taken for sleep.
Essential for immune cell development and function
Needed for testosterone synthesis. Testosterone rose in marginally deficient older men
Required for tissue repair and growth
How Zinc works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Showing the best-supported pathways — 10 lower-evidence nodes hidden for clarity.
RDA is 11-13mg; supplementation may be needed with medical supervision
May need 50% more due to reduced absorption from plant sources
Often depleted through sweat; supplementation commonly beneficial
Reduces antibiotic absorption. Each antibiotic's label sets its own gap, so ask the pharmacist to schedule zinc apart from it.
Penicillamine increases zinc loss, so zinc can run low during treatment. Ask the pharmacist to schedule zinc apart from penicillamine.
Some diuretics increase zinc excretion
Severely reduced antibiotic effectiveness
Severely reduced antibiotic effectiveness
Reduced antibiotic effectiveness
Significantly reduced antibiotic effectiveness
Tip: Always take with food
Tip: Try different form
Tip: Don't exceed 25mg/day long-term (EU upper limit). Add copper
Zinc has an evidence score of 8.5/10 — very strong evidence based on 633 indexed studies, including 29 meta-analyses. Involved in 300+ enzymatic reactions — supports immune defense, testosterone production, wound healing, and sleep quality. Representative study: PMID 37447182.
The commonly studied dose of Zinc is 15-25mg daily (a typical label dose, not the dose used in the cited trials, which used about 30 mg a day). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Zinc is in the evening. Taking it with food is preferred. Zinc is an essential trace mineral involved in over 300 enzymatic reactions including immune function, DNA synthesis, wound healing, and testosterone production.
Zinc is generally well-tolerated and considered safe for most healthy adults at recommended doses. Reported side effects are uncommon and include nausea, copper deficiency (long-term high dose), metallic taste. Use caution if any of these apply to you: Copper deficiency (zinc depletes copper).
Magnesium
Mixed evidenceSupports 300+ enzymatic reactions — critical for sleep, stress response, muscle function, and cognitive health.
Vitamin D3
Probably helpsHormone-like vitamin that regulates 1,000+ genes — deficiency is widespread and linked to poor immunity, depression, and bone loss.
Ashwagandha
Likely helpsReduces cortisol and anxiety while improving sleep quality and physical recovery in stressed adults.
Vitamin C
Likely helpsHumans cannot synthesize this vitamin — required for collagen production, immune cell function, and iron absorption; athletes need more.
Eye & Vision
AREDS2 works for diagnosed AMD; lutein/screen-strain claims are weaker. Who actually benefits.
Prostate Health & BPH
The popular one (saw palmetto) mostly fails in rigorous trials; beta-sitosterol is the better bet.
Thyroid Support
Selenium helps; iodine can WORSEN Hashimoto’s. The honest take on "thyroid support".
Male Fertility & Sperm Health
CoQ10, zinc, selenium, carnitine modestly help sperm parameters — but live-birth evidence is weak.
Mood & Depression
Saffron, EPA omega-3, SAMe have real adjunct evidence — but these aren’t a substitute for care, and some interact dangerously.
Immune Support
Zinc timing, vitamin D, the real vitamin C effect — and the elderberry caution.
Testosterone Boosters: Do They Work?
Mostly hype unless you’re deficient — what has modest evidence vs what doesn’t, and when to see a doctor.
Supplement Timing & Combining
When to take what, with or without food, and which supplements compete vs pair well.
Acne: What Actually Works
Benzoyl peroxide & retinoids → salicylic/azelaic/niacinamide → naturals, tiered by evidence.
Explore: Best supplements for Skin, Hair & BeautyBest supplements for Vitality & LongevityBest supplements for SleepBest supplements for Athletic PerformanceBest supplements for Men's HealthBest supplements for Body HealthBest supplements for Focus, Memory & MoodBest supplements for Women's Health
Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 632 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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