Outcomes

What zinc actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Outcome Effect size Evidence Dose Weeks Rank

Reduce diarrhea and recover faster Proven modest benefit

Fewer loose stools, shorter episodes, and less fluid loss.

3 meta-analyses n=36k 2–10 mg 2–78 wk

19416499·34167148·39641338

small

3 meta-analyses n=36k Meta-analyzed

2–10 mg

2–78 wk

—

Improve insulin sensitivity Likely modest benefit

Your cells respond to insulin again so your pancreas works less hard.

5 meta-analyses n=1.1k 4.29–149.82 mg 8–52 wk #5/78

22808346·31827626·35451678·35946077 +1 more

small

5 meta-analyses n=1.1k Meta-analyzed

4.29–149.82 mg

8–52 wk

#5 /78

Steady your blood sugar levels Likely modest benefit

Keeps fasting glucose and your three-month average in a healthier range.

5 meta-analyses n=1.0k 4.29–149.82 mg 8–52 wk #10/109

18795212·22808346·31827626·35451678 +1 more

small

5 meta-analyses n=1.0k Meta-analyzed

4.29–149.82 mg

8–52 wk

#10 /109

Catch fewer colds and infections Not enough research

Your immune barriers intercept more viruses before they take hold.

2 meta-analyses n=591 5–42.9 mg 78 wk

32342851·33472840

small

2 meta-analyses n=591 Meta-analyzed

5–42.9 mg

78 wk

—

Recover from colds faster Likely real but unnoticeable

Shaves days off a cold by clearing the virus sooner.

4 meta-analyses n=1.5k 5–50 mg 1 wk #2/10

22566526·32342851·33472840·33576820

trivial

4 meta-analyses n=1.5k Meta-analyzed I²=95%

5–50 mg

1 wk

#2 /10

Ease cold and flu severity Not enough research

When you do get sick, the whole experience hits lighter.

3 meta-analyses n=520 50–150 mg 1–6 wk

22566526·33576820·37057088

trivial

3 meta-analyses n=520 Meta-analyzed

50–150 mg

1–6 wk

—

Build key mineral stores Likely real but unnoticeable

Essential mineral blood levels rise into optimal range, confirming absorption.

18 meta-analyses n=18k 0.9–300 mg 2–42 wk #3/5

23289009·35565906·36055780·40836314 +14 more

trivial

18 meta-analyses n=18k Meta-analyzed I²=97%

0.9–300 mg

2–42 wk

#3 /5

Ease bronchitis symptoms Not enough research

Shorten and lighten a bronchitis episode for you or your child.

1 RCT n=— 50–150 mg 6 wk

37057088

—

1 RCT n=—

50–150 mg

6 wk

—

Support pancreas insulin output Not enough research

Helps the pancreatic cells that make insulin keep up with daily demand.

1 RCT n=— 30 mg 52 wk

35451678

—

1 RCT n=—

30 mg

52 wk

—

Outcome	Effect	Evidence	Dose	Weeks	Rank
Reduce diarrhea and recover faster Proven modest benefit	small	3 meta-analyses n=36k Meta-analyzed	2–10 mg	2–78 wk	—
Improve insulin sensitivity Likely modest benefit	small	5 meta-analyses n=1.1k Meta-analyzed	4.29–149.82 mg	8–52 wk	#5/78
Steady your blood sugar levels Likely modest benefit	small	5 meta-analyses n=1.0k Meta-analyzed	4.29–149.82 mg	8–52 wk	#10/109
Catch fewer colds and infections Not enough research	small	2 meta-analyses n=591 Meta-analyzed	5–42.9 mg	78 wk	—
Recover from colds faster Likely real but unnoticeable	trivial	4 meta-analyses n=1.5k Meta-analyzed	5–50 mg	1 wk	#2/10
Ease cold and flu severity Not enough research	trivial	3 meta-analyses n=520 Meta-analyzed	50–150 mg	1–6 wk	—
Build key mineral stores Likely real but unnoticeable	trivial	18 meta-analyses n=18k Meta-analyzed	0.9–300 mg	2–42 wk	#3/5
Ease bronchitis symptoms Not enough research		1 RCT n=—	50–150 mg	6 wk	—
Support pancreas insulin output Not enough research		1 RCT n=—	30 mg	52 wk	—

Buy well

Recommended Zinc products

Real products that dose Zinc where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Zinc dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

Risk profile

Adverse events and known drug interactions

Safety events

acute respiratory distress syndrome severe

cardiac arrhythmia severe

Refractory hypoxemia (ECMO cannulation) severe

prostate cancer, aggressive severe

Hospitalizations for genitourinary causes moderate

Elevated liver enzymes (ALT/AST) moderate

Nervous system symptoms (involuntary shaking/lower limb tremor) moderate

Anemia (self‑reported) mild

Drug interactions

Lovastatin major decreases effect

Penicillamine moderate decreases effect

other moderate decreases effect

Carbamazepine moderate decreases concentration

Sodium Valproate moderate decreases concentration

Phenytoin moderate decreases concentration

Clonazepam moderate decreases concentration

Levetiracetam moderate decreases concentration

Intravenous Immunoglobulin moderate additive

Ciprofloxacin moderate decreases effect

Co-studied with

Supplements that share evidence with zinc

Iron 8 shared outcomes · d=0.24
Copper 8 shared outcomes · d=0.24
Drug:Pantoprazole 4 shared outcomes · d=0.03

Sources

Generated August 14, 2026

Zinc

What zinc actually does, by outcome

Recommended Zinc products

Adverse events and known drug interactions

Supplements that share evidence with zinc

More evidence for Zinc

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Cordyceps

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Zinc

Recommended Zinc products

More evidence for Zinc

NewZinc: The Metal That Had to Become Vapor—and Then Became Medicine

NewBest Supplements to Ease ADHD Symptoms in Children (2026)

NewMetabolic health: evidence map across 82 supplements

NewCordyceps

NewEchinacea purpurea

NewJujube

Zinc: The Metal That Had to Become Vapor—and Then Became Medicine

Best Supplements to Ease ADHD Symptoms in Children (2026)

Metabolic health: evidence map across 82 supplements

Cordyceps

Echinacea purpurea

Jujube