Zinc Citrate

Well-balanced zinc form offering good bioavailability with moderate digestive tolerance, excellent for daily supplementation

Scientific nameZinc Citrate FormulaC12H10O14Zn3 Molecular weight574.33 g/mol CAS546-46-3

70 absorption score

8 safety / 10

25 USD per month

34 elemental zinc %

6 documented interactions

Check it against something

Evidence level A

Zinc Citrate with:

90 out of 100

Works better together Compatible. Timing differs, so follow each supplement's own window.

Check it against your whole stack →

What it does

mechanism and evidence for each claim

Enhanced bioavailability

Better absorbed than sulfate with good digestive tolerance

Citric acid enhances zinc solubility and absorption Evidence A-grade 1-2 weeks

Balanced digestive tolerance

Good compromise between absorption and stomach comfort

Citrate form less irritating than sulfate but well-absorbed Evidence A-grade Immediate

Immune system optimization

Effectively supports immune function and resistance

Zinc essential for immune cell development and activation Evidence A-grade 2-4 weeks

Antioxidant support

Supports body's natural antioxidant defense systems

Zinc component of superoxide dismutase and other enzymes Evidence A-grade 2-6 weeks

Wound healing and tissue repair

Promotes faster healing and healthy tissue maintenance

Zinc cofactor for collagen synthesis and cell division Evidence A-grade 1-4 weeks

Others take these for the same thing

Same goal, different mechanism — check any of them against this one

Probiotics for Autoimmune Disease Support Gut health & immune modulation 10-100 billion CFU daily B 60% Magnesium Glycinate Superior absorption sleep & muscle support 200-600 mg A 90% Magnesium Citrate Balanced absorption & digestive support 300-600 mg A 35% Chloride Electrolyte & digestive support 2300mg A 95% Bone Broth Collagen Gut healing & collagen support 20-40g powder B 85% Psyllium Husk Digestive health & cholesterol support 5-15g A 95%

Or a different form of the same thing

the comparison people search most

Zinc Citrate vs Zinc Picolinate absorption 70 against 95 · $25 against $20 a month 95% Zinc Citrate vs Zinc Gluconate absorption 70 against 60 · $25 against $20 a month 60% Zinc Citrate vs Zinc Carnosine absorption 70 against 85 · $25 against $35 a month 85% Zinc Citrate vs Zinc Bisglycinate absorption 70 against 85 · $25 against $35 a month 85%

All Zinc forms ranked by absorption →

Every pair we checked

12 combinations scored by the engine

Zinc Citrate + Copper Bisglycinate High zinc intake reduces copper absorption Needs attention 22

Zinc Citrate + Iron Sulfate High zinc doses may interfere with iron absorption Needs attention 58

Zinc Citrate + Calcium Carbonate Very high calcium may affect zinc absorption Needs attention 58

Zinc Citrate + Caffeine No documented interaction either way No known interaction 70

Zinc Citrate + Creatine Monohydrate No documented interaction either way No known interaction 70

Zinc Citrate + Lactase No documented interaction either way No known interaction 70

Zinc Citrate + Bovine Collagen No documented interaction either way No known interaction 70

Zinc Citrate + DHA No documented interaction either way No known interaction 70

Zinc Citrate + Turmeric No documented interaction either way No known interaction 70

Zinc Citrate + Whey Protein Protein enhances zinc absorption and utilization Works better together 82

Zinc Citrate + Vitamin D3 Both support immune function and wound healing Works better together 90

Zinc Citrate + Vitamin C (Ascorbic Acid) Both support immune function and wound healing Works better together 90

Dosage

With food preferred

Daily15-25 mg

Maintenance10-15 mg daily

Therapeutic20-40 mg daily

Immune support15-25 mg daily

Elemental zincContains ~31% elemental zinc

Upper limit 40 mg NIH ODS

Before you take it

VeganYes

When to expect it

First Effects1-2 weeks for immune and antioxidant benefits

Peak Benefits4-8 weeks for optimal zinc status and health benefits

Deficiency DevelopmentWeeks to months with inadequate intake

Toxicity OnsetRare with recommended doses

How to measure it

$40-80

MarkerSerum zinc, plasma zinc, or cellular zinc

OptimalSerum: 70-120 μg/dL, Plasma: 80-120 μg/dL

Deficient belowSerum: <70 μg/dL

FrequencyEvery 6-12 months during supplementation

What people actually reported to the FDA

CAERS, 517 reports naming it as the suspect

Most reported effects

Cough 44

Malaise 40

Vomiting 40

Nausea 38

Dyspnoea 36

Excluded from the list above: choking (76). Those are people struggling with the tablet itself, not with the compound.

Named as the suspect 517 reports of 964 that mention it at all

Serious outcome 87% hospitalisation, emergency room or worse

Other Serious or Important Medical Event398

Hospitalization81

Visited a Health Care Provider71

Reports are voluntary and unverified — they record what someone experienced while taking something, not what the compound caused. Counts skew towards products people take a lot of, and a serious outcome is more likely to be reported than a mild one, so these are not rates. How we filter them →

What actually reaches you

The label counts the carrier, your body does not

Elemental zinc 34.2% of 574.33 g/mol

Absorption High 70 of 100 · absorbs well relative to other forms

Delivered daily 4.8 mg

Cost per 100 mg delivered $17.40 comparative — uses the absorption score, not a measured percentage

A 500 mg capsule of Zinc Citrate contains 171 mg of zinc. How much of that crosses into your blood is not measured for this form — the absorption score ranks it against other forms, it is not a share of the dose. How this is calculated →

Works better with

3 documented

Vitamin C

Both support immune function and wound healing

Complementary antioxidant and tissue repair effects · level A

Vitamin E

Both components of antioxidant defense system

Complementary antioxidant enzyme support · level B

Protein

Protein enhances zinc absorption and utilization

Amino acids facilitate zinc transport and function · level A

What not to take with Zinc Citrate

3 documented

Copper

High zinc intake reduces copper absorption

Competition for intestinal absorption transporters · moderate significance

Iron Supplements

High zinc doses may interfere with iron absorption

Mineral competition for absorption pathways · mild significance

Calcium High Dose

Very high calcium may affect zinc absorption

Potential mineral competition · mild significance

Medication interactions

Discuss these with a pharmacist before combining

antibiotics-tetracycline-quinolones Major

Zinc reduces antibiotic absorption

What to do: Space doses 2-4 hours apart

penicillamine Major

Zinc reduces penicillamine effectiveness

What to do: Space doses 2+ hours apart

diuretics Minor

Some diuretics may increase zinc loss

What to do: Monitor zinc status with chronic diuretic use

Available forms

bioavailability compared

Ranks 4 of 5 among zinc forms. Zinc Picolinate absorbs better — 95%. Compare all forms →

Zinc Citrate (Capsules/Tablets) 70

Zinc Citrate (Capsules/Tablets): Good bioavailability, Balanced tolerance, Reasonable cost, Daily use suitable

Food sources

before you supplement

Zinc citrate not found naturally in foods Only available as supplement · 70

Citrus fruits (provide citric acid) Natural citric acid may enhance zinc absorption · 30

Red meat (natural zinc) 4-8 mg per 3 oz serving · 40

Seafood (natural zinc) Variable, oysters highest · 50

Too little

deficiency signs

Compromised immune function and frequent infections
Slow wound healing and tissue repair
Hair loss and skin disorders
Loss of taste and smell sensitivity
Poor appetite and growth delays
Delayed sexual development
Night blindness and vision problems

Too much

toxicity signs

Nausea and digestive upset with high doses
Copper deficiency with chronic excessive intake
Reduced immune function (paradoxically)
Interference with other mineral absorption
Fatigue and weakness

Who benefits most

daily-zinc-supplementation

Excellent balance of absorption and tolerance for daily use

15-25 mg daily

moderate-budget-conscious

Good value offering better absorption than basic forms

10-20 mg daily

immune-support-maintenance

Reliable form for ongoing immune system support

15-25 mg daily

antioxidant-support

Effective for supporting antioxidant enzyme systems

15-30 mg daily

balanced-supplementation

Good all-around zinc form for general health

10-20 mg daily

Where to buy it

compare forms first

Look for Zinc Citrate at 15-25 mg per serving. The form that matters here is Zinc Citrate (Capsules/Tablets).

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How it works

Citric acid enhances zinc dissolution and intestinal absorption
Better bioavailability than sulfate with improved tolerance
Essential cofactor for numerous enzymatic reactions
Critical for immune cell development and function
Required for DNA synthesis and protein metabolism
Component of antioxidant enzyme systems

Key findings

what the evidence supports

Good bioavailability with better tolerance than zinc sulfate
Effective for supporting immune function and zinc status
Well-suited for daily supplementation with moderate side effects
Good balance of cost, effectiveness, and tolerance

Sources: NIH Examine.com · data reviewed 2026-08-02

Compiled by Denis, who maintains this database and holds no medical qualification — every figure here is sourced or derived, never asserted. How we calculate it →

Common questions

What are the benefits of Zinc Citrate?

Documented effects: Enhanced bioavailability; Balanced digestive tolerance; Immune system optimization; Antioxidant support. Better absorbed than sulfate with good digestive tolerance

How much Zinc Citrate should you take per day?

The common daily range is 15-25 mg. By goal — maintenance: 10-15 mg daily; therapeutic: 20-40 mg daily; immune support: 15-25 mg daily; elemental zinc: Contains ~31% elemental zinc.

When is the best time to take Zinc Citrate?

With food preferred. First effects are typically reported within 1-2 weeks for immune and antioxidant benefits.

What are the side effects of Zinc Citrate?

At excessive doses: Nausea and digestive upset with high doses, Copper deficiency with chronic excessive intake, Reduced immune function (paradoxically), Interference with other mineral absorption, Fatigue and weakness. Safety rating at normal doses is 8 out of 10.

What should you not take with Zinc Citrate?

Separate it from Copper, Iron Supplements, Calcium High Dose by two to four hours. High zinc intake reduces copper absorption

Does Zinc Citrate interact with medications?

Documented interactions with antibiotics-tetracycline-quinolones, penicillamine, diuretics. Discuss these with a pharmacist before combining.

How much Zinc Citrate is too much?

The tolerable upper intake level is 40 mg per day for adults, per NIH ODS. Above that, the risk of adverse effects rises: Nausea and digestive upset with high doses, Copper deficiency with chronic excessive intake, Reduced immune function (paradoxically).

How do you know if you need Zinc Citrate?

The marker is Serum zinc, plasma zinc, or cellular zinc, optimal range Serum: 70-120 μg/dL, Plasma: 80-120 μg/dL. Common deficiency signs: Compromised immune function and frequent infections, Slow wound healing and tissue repair, Hair loss and skin disorders, Loss of taste and smell sensitivity.

Taken for

74 Digestion

Lactase · Lactobacillus acidophilus · Protease