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Zinc

Mineral ·Strong evidence ·Reviewed May 2026

Essential trace mineral involved in immune function, wound healing, DNA synthesis, and testosterone production. Second most abundant trace mineral in the body.

Evidence tier
Strong
Indexed sources
22 2006–2024
Interactions
43
Cost / month
$1.50 budget
Read the sources → Compare profiles
What it's good for
  • Immune support7,8
  • Wound healing15,17
  • Testosterone support (primarily in zinc-deficient individuals)14,18
  • Skin health
  • Taste and smell
What to watch for
  • Nausea on empty stomach
  • Copper depletion with chronic use
  • Metallic taste
  • Must balance with copper (1-2mg Cu per 15mg Zn)19,20
  • Certain antibiotics (separate by 2 hours)

The bottom line

Evidence rating strong. Most-documented uses: immune support, wound healing, testosterone support (primarily in zinc-deficient individuals). 22 sources indexed (2006–2024), with 43 interaction records on file.

The science

How it works, mechanistically.

Core mechanism

Structural component of over 300 enzymes and 1,000+ transcription factors. Essential for T-cell development and function, acts as antioxidant via superoxide dismutase (SOD), required for insulin storage and release, and critical for 5-alpha reductase and testosterone metabolism.7

Class
Trace Mineral
Found in food
Oysters, Beef, Pumpkin seeds
Low-status signs
Frequent illness, Slow wound healing
Absorption
Water-soluble; take with food
Dosing

Dosing & protocol.

Common range
15–30 mg daily
Recommended form
Zinc picolinate or zinc bisglycinate (best absorption)

Take with food to prevent nausea; competes with iron and copper for absorption4,19

Dosing protocol

Maintain · 15-30 mg/day

Cycle breaks help reduce the risk of pushing copper status down during long-term higher-dose use.4,10

Cycling recommendedNo tolerance buildup
Forms

Forms & what to buy.

Ranked by evidence and value.

Picolinate Recommended
High-bioavailability zinc form. Widely used for efficient absorption.
Mid15-30 mg/day
Glycinate / Bisglycinate
Gentle chelated form with strong absorption. Chelated zinc is usually well tolerated.
Premium15-30 mg/day
Citrate
Good absorption with moderate cost. Balanced option between cost and tolerability.
Mid15-30 mg/day
Gluconate
Common lozenge and budget form. Often used in lozenges for acute immune support.
Budget15-30 mg/day or 75 mg/day in lozenges short term
Oxide
Lower bioavailability than chelated forms. Cheap but less efficient for restoring low zinc status.
Budget15-30 mg/day
Acetate
Good lozenge form for cold support. Frequently used in cold-onset lozenges.
Mid75 mg/day short term
Carnosine
Gut-targeted zinc form. Studied specifically for gut lining support rather than whole-body repletion.
Premium37.5-75 mg/day
Cost

What it actually costs.

Real-world pricing across three quality tiers. Assumes Picolinate.

BudgetBest value
$1.50 /mo
$0.05 per dose
Mid
$3.00 /mo
$0.10 per dose
Premium
$6.00 /mo
$0.20 per dose

Assumes 15-30 mg/day. Zinc is cheap in absolute terms, but long-term use should account for copper balance rather than dose alone. Updated 2026-04-02.

From food

The same dose, as food.

How much you'd eat to match a supplemental dose.

15 mg zinc
About 2 medium oysters or about 6 ounces beef plus 0.5 cup pumpkin seeds

Oysters are by far the most efficient food source.

25 mg zinc
About 4 oysters plus a zinc-rich meal

Higher therapeutic zinc doses are much easier to hit with supplements than with food alone.

Goals

Goal-based dosing.

General immune support

Dose: 15-25 mg daily7,8

Timing: With food

Long-term higher doses can lower copper status.

Acne or skin support

Dose: 25-30 mg daily16,22

Timing: With dinner

Monitor for nausea and consider adding copper if used long term.

Short-term cold support

Dose: 75 mg elemental daily for 5-7 days10,9

Timing: Start within 24 hours of symptoms

Short-term only; stop once the acute illness passes.

Lab work

Markers to track.

What to test, the optimal window inside the conventional range, and how long a response takes.

Serum Zinc

Effective zinc repletion should raise serum zinc, although acute illness can blunt the signal.14,18

Optimal
80–120 mcg/dL
Conventional
60–120 mcg/dL
Responds in
4-8 weeks.

Zinc is an acute-phase reactant. Avoid testing during active infection when possible.

CopperCeruloplasmin

Serum Copper Cu

Sustained high-dose zinc can lower serum copper over months by reducing copper absorption, so the aim is to keep copper within normal range; the effect is dose-dependent and most likely with prolonged high intakes without matching copper.19,4

Optimal
70–140 ug/dL
Conventional
70–140 ug/dL
Responds in
12 to 24 weeks

Serum copper is an imperfect marker because it is raised by inflammation and estrogen, so interpret alongside ceruloplasmin and consider checking hsCRP. Retest after a few months on high-dose zinc, and consider a small amount of supplemental copper if levels fall.

CeruloplasminSerum ZincComplete Blood CounthsCRP
Why people use it

Symptoms it's matched to.

Where this appears in the symptom-to-supplement map, ranked by relevance.

Altered taste or smell (dysgeusia / hyposmia)

92% relevance

Zinc is essential for the taste-bud enzyme gustin and for olfactory cell turnover, so correcting a deficiency can restore blunted or distorted taste and smell.

SensoryStrong evidenceZinc picolinate or zinc gluconate, 15 to 30 mg daily with food

Most useful when intake is low or there is a clear deficiency. Long-term high-dose zinc can deplete copper, so pair with periodic copper if used beyond a few months.

Slow wound healing

85% relevance

Zinc is essential for epithelialization, collagen synthesis, and immune function in wound repair.15,17

ImmuneStrong evidenceZinc picolinate or bisglycinate, 15 to 30 mg per day

Pair with copper if used long term. Topical zinc oxide also useful.

Dandruff / flaky scalp

85% relevance

Topical zinc pyrithione has antifungal and sebum-regulating effects against Malassezia yeast, a main driver of dandruff and seborrheic flaking.1,2

AppearanceStrong evidenceTopical zinc pyrithione shampoo

The topical pyrithione form is the proven one; oral zinc only helps if you are deficient.

Telogen effluvium (stress- or illness-triggered diffuse shedding)

84% relevance

Zinc is required for the hair follicle cycle, and documented zinc deficiency can provoke or worsen diffuse shedding.

AppearanceModerate evidenceZinc picolinate or zinc, 15 to 25 mg with food

Most useful when intake or status is genuinely low; supplementing above need does not accelerate regrowth. Pair long-term use with a little copper.

Frequent illness / weak immunity

82% relevance

Zinc is central to immune-cell function and mucosal defense.1,2

ImmuneStrong evidenceZinc picolinate or acetate lozenges

Short-term higher dosing is for acute illness, not long-term routine use.

Acne

82% relevance

Oral zinc modestly improves inflammatory acne via anti-inflammatory and antiandrogenic mechanisms.16,22

AppearanceModerate evidenceZinc picolinate or gluconate, 30 mg per day with food

Take with food to reduce nausea. Pair with copper if used long term.

Low appetite / poor appetite

82% relevance

Zinc deficiency directly blunts taste and smell and reduces appetite, so repletion can restore normal hunger cues.19,20

DigestiveStrong evidenceZinc picolinate or citrate, 15 to 30 mg daily with food

The appetite benefit is clearest when a true deficiency exists; long-term high-dose zinc needs balancing copper. Investigate underlying causes of poor appetite with a clinician.

Seborrheic dermatitis (greasy facial scaling and redness)

82% relevance

Topical zinc pyrithione has antifungal action against Malassezia yeast and sebum-regulating effects on the oily facial and chest skin where seborrheic dermatitis flares.

AppearanceStrong evidenceTopical zinc pyrithione cleanser or cream

The proven benefit is topical on affected facial or chest skin; oral zinc only helps if you are genuinely deficient. This differs from scalp dandruff: facial seborrheic dermatitis is the inflamed, greasy, red, scaly variant on eyebrows, nasolabial folds, and chest.

Frequent sore throat

80% relevance

Zinc supports immune cell function and, in lozenge form, may shorten the duration of upper-respiratory symptoms when started early.7,8

ImmuneModerate evidenceZinc acetate or gluconate lozenges, about 75 mg total daily in divided doses during illness, short term only

Do not use high-dose zinc long term as it depletes copper; recurrent sore throats with fever warrant a strep test and clinician visit.

Post-surgery recovery support (perioperative tissue repair)

80% relevance

Zinc drives DNA synthesis and cell division in regenerating tissue and supports the immune response that prevents wound infection.

ImmuneModerate evidenceZinc Picolinate or zinc gluconate, 15 to 30 mg with food

Benefit is clearest when zinc status is low; avoid prolonged high doses (over 40 mg/day) as they can deplete copper, and confirm with your surgical team.

Immunosenescence / frequent infections in older adults

79% relevance

Zinc is required for the development and function of immune cells, and older adults are prone to marginal deficiency that may impair immune competence.1,2

ImmuneModerate evidenceZinc picolinate or citrate, 10 to 15 mg daily with food

Avoid chronic high doses, which can deplete copper; use as supportive care alongside medical evaluation of recurrent infections.

Rosacea / facial redness

78% relevance

Zinc has anti-inflammatory and antioxidant actions in skin and may serve as adjunct support for inflammatory facial conditions, mostly when intake or status is suboptimal.1,2

AppearanceEmerging evidenceZinc picolinate

Take with food to limit nausea, and avoid high doses long term without balancing copper.

Protocols

Featured in protocols.

Evidence-based stacks that include it, with the exact dose and timing each one uses.

Immunity Protocol

ImmunityCoreStrong evidenceBeginner$20-35/mo
Dose here
30 mg
Timing
With food

Essential for T-cell maturation and NK cell activity; deficiency impairs both innate and adaptive responses17,7

Foundation Stack

FoundationOptionalStrong evidenceBeginner$20-30/mo
Dose here
15 mg
Timing
With food

Supports immune function, wound healing, and protein synthesis; moderate dose avoids copper depletion15,17

Skin Support Protocol

Skin & HairOptionalModerate evidenceBeginner$25-45/mo
Dose here
15 mg
Timing
With food

Supports normal cell division and skin integrity, especially when zinc status is low.7,17

Hormonal Balance Protocol

Hormonal BalanceCoreStrong evidenceIntermediate$30-50/mo
Dose here
30 mg
Timing
With food

Zinc deficiency can affect reproductive and immune markers; benefits are most plausible when baseline zinc status is low.20,7

Eye Health Protocol

Eye HealthOptionalStrong evidenceBeginner$25-45/mo
Dose here
25 mg
Timing
With food

Required cofactor for retinol metabolism in the retina; included in the original AREDS formulation.17

Men's Hormonal Support Protocol

Hormonal BalanceCoreModerate evidenceIntermediate$45-75/mo
Dose here
15-30 mg/day (elemental)
Timing
With an evening meal, separated from magnesium and any iron or calcium by about 2 hours

Zinc is an essential cofactor for testosterone synthesis, and observational data link deficiency to lower levels, so correcting a genuine deficiency may help restore suppressed testosterone. Supplementing well above need in men who are already replete is unlikely to raise testosterone further, and chronic high doses can impair copper status.14,17

Hair Growth & Thickness Protocol

Skin & HairCoreModerate evidenceIntermediate$35-55/mo
Dose here
15-25 mg elemental
Timing
Once daily with food, separated from Iron by about 2 hours

Zinc supports the protein synthesis and cell division that drive the follicle hair cycle, and correcting a low zinc status can help shedding tied to deficiency; routine high-dose use in replete people is not justified and can impair copper status.7,17

Thyroid Support Protocol

Hormonal BalanceCoreEmerging evidenceIntermediate$25-45/mo
Dose here
15-25 mg elemental
Timing
Once daily with food, separated from iron by about 2 hours

Zinc contributes to deiodinase activity and to the function of thyroid hormone receptors, and deficiency is associated with impaired conversion of T4 to T3. Keep long-term intake at or below 40 mg total to avoid copper depletion.17,1

Plant-Based Nutrient Foundation

FoundationOptionalModerate evidenceBeginner$30-55/mo
Dose here
8-15 mg elemental daily, staying within the 40 mg adult upper limit
Timing
With food to reduce stomach upset, and separated from iron and calcium by about 2 hours

Phytates in grains and legumes reduce zinc absorption, so plant-based eaters may have higher zinc requirements to support normal immune function, wound healing, and protein synthesis. Modest supplementation can help close the gap when dietary intake is marginal.1,2

Acute Cold and Flu Recovery Protocol

ImmunityCoreModerate evidenceBeginner$25-45/mo
Dose here
75-100 mg total daily from lozenges, divided into doses of about 10-15 mg every 2 to 3 waking hours
Timing
Start within 24 hours of first symptoms and dissolve lozenges slowly in the mouth (do not chew or swallow whole); limit this high-dose regimen to about 5 to 7 days, then stop

Zinc ions released in the mouth and throat may interfere with rhinovirus replication and local inflammation. Meta-analyses suggest faster symptom resolution mainly when lozenges are started within roughly 24 hours of onset, though results vary by salt and dose.1,2

Genetics

Who responds differently.

SLC30A8rs13266634~50% of population

Zinc transporter genotype modified insulin secretion response to zinc supplementation in an Old Order Amish trial (PMID 25348609).

Recommendation: Use zinc for clear dietary or clinical reasons rather than assuming uniform glucose effects across genotypes.

Safety

Full safety detail.

Side effects

  • Nausea on empty stomach
  • Copper depletion with chronic use
  • Metallic taste

Contraindications

  • Must balance with copper (1-2mg Cu per 15mg Zn)19,20
  • Certain antibiotics (separate by 2 hours)
Interactions

Interaction records.

ModerateConflict

Iron

Iron and zinc compete for the same absorption pathways when taken together in supplement form.

Recommendation: Take iron and zinc at different times of day, separated by at least 2 hours.

SeriousCaution

Copper

Chronic high-dose zinc supplementation (>40mg/day) can induce copper deficiency by upregulating metallothionein, which binds copper in enterocytes.

Recommendation: If supplementing zinc >25mg daily, add 1-2mg copper. Many zinc supplements include copper for this reason. Monitor copper status.

InfoSynergy

Vitamin D3

Adequate zinc status supports normal zinc-finger transcription biology, including vitamin D receptor DNA-binding domains. Evidence does not show that extra zinc improves vitamin D signaling in zinc-replete people.

Recommendation: Use zinc to meet normal intake or correct deficiency; do not add high-dose zinc solely to activate vitamin D.

InfoSynergy

Vitamin A

Zinc is required for retinol-binding protein synthesis and vitamin A transport from the liver. Zinc deficiency impairs vitamin A mobilization.

Recommendation: Ensure adequate zinc when supplementing vitamin A. Zinc deficiency can cause functional vitamin A deficiency even with adequate liver stores.

ModerateTiming Sensitive

Calcium

High-dose calcium can reduce zinc absorption when taken simultaneously.

Recommendation: Separate calcium and zinc supplements by at least 2 hours for optimal absorption of both.

InfoCaution

Vitamin B9

High-dose zinc (>40mg) may impair folate absorption by inhibiting the folate conjugase enzyme in the gut.

Recommendation: If taking high-dose zinc, monitor folate status or separate doses.

InfoSynergy

Collagen Peptides

Zinc is essential for collagen synthesis enzymes and wound healing. Supports collagen crosslinking and skin repair.

Recommendation: Take zinc with collagen peptides for enhanced skin, joint, and wound healing support.

InfoSynergy

Selenium

Both support immune function and antioxidant defense. Zinc supports SOD and thymulin; selenium supports GPx and selenoproteins.

Recommendation: Take together for comprehensive immune and antioxidant support.

InfoCaution

Methylfolate

High-dose zinc (>40mg) may impair folate absorption by inhibiting the folate conjugase enzyme in the gut.

Recommendation: If taking high-dose zinc, monitor folate status or separate doses.

ModerateConflict

Iron Bisglycinate

Iron Bisglycinate and zinc compete for the same absorption pathways when taken together in supplement form.

Recommendation: Take iron bisglycinate and zinc at different times of day, separated by at least 2 hours.

InfoSynergy

Quercetin

Quercetin has shown zinc-ionophore activity in cell models, but clinical immune benefit from combining quercetin with zinc is not established.

Recommendation: Do not rely on quercetin plus zinc as antiviral treatment. Use only as general nutrition support and keep zinc within standard supplemental limits unless clinician-directed.

InfoTiming Sensitive

Magnesium Glycinate

High-dose zinc and high-dose magnesium can compete at intestinal divalent cation transporters; effect is significant only at supplemental doses above typical RDA.

Recommendation: Take at separate meals, ideally 2 hours apart. Magnesium evening, zinc morning or midday is a common pattern.

Search all 43 interaction records for Zinc →

Sources

Sources, by evidence tier.

Numbered references. Citations throughout the page link here.

Meta-analyses & systematic reviews

12

Randomized controlled trials

1
  • 13Effects of zinc supplementation on immune function in elderly subjects: a randomized controlled trialNeeds sourceNo linkBarnett JB, Dao MC, Hamer DH et al. · AJCN · 2016

Reviews & position papers

7
  • 14Correlation between serum zinc and testosterone: A systematic reviewNeeds reviewPMIDTe L et al. · J Lab Precis Med · 2023

    Systematic review confirms significant correlation between zinc status and testosterone; zinc supplementation benefits those who are deficient but not zinc-replete men

  • 15Zinc Intakes and Health Outcomes: An Umbrella ReviewNeeds reviewPMIDTsatsakis A et al. · Nutrients · 2022

    Umbrella review of zinc health outcomes covering immune function, wound healing, and metabolic effects across multiple meta-analyses

  • 16Zinc supplementation for acne vulgaris: a systematic review of the clinical evidenceNeeds sourceNo linkYee BE, Richards P, Shenefelt PD et al. · J Drugs Dermatol · 2020
  • 17Zinc in Wound Healing ModulationNeeds reviewPMIDLin PH et al. · Nutrients · 2018

    Zinc is a cofactor for numerous metalloenzymes required for cell membrane repair, cell proliferation, growth and immune system function in wound healing

  • 18Zinc supplementation and serum testosterone levels in adult males: a systematic reviewNeeds sourceNo linkPrasad AS, Mantzoros CS, Beck FW et al. · Nutrition · 2016
  • 19The risk of copper deficiency in patients prescribed zinc supplementsNeeds reviewPMIDDuncan A et al. · J Clin Pathol · 2015

    9% of patients on high-dose zinc developed unexplained anemia and 7% neurological symptoms typical of copper deficiency

  • 20Zinc requirements and the risks and benefits of zinc supplementationNeeds reviewPMIDFosmire GJ · J Am Diet Assoc · 2006

    At 100-300 mg Zn/day, copper deficiency with anemia, neutropenia, and impaired immune function has been reported

Reference material

2
Keep exploring

Deep dives & adjacent profiles.

Strong evidenceZinc lozenges shorten the duration of the common coldModerate evidenceZinc supports immune functionGoal hubImmune Support
Vitamin CVitaminVitamin AVitaminZinc PicolinateMineralVitamin D3VitaminL-GlutathioneAmino AcidBeta-CaroteneOther

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