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Ingredient guide

What does zinc do for the body? Benefits, graded

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated 2026-10-13.

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

Zinc is a mineral your body needs for hundreds of enzymes, for making proteins and DNA, for normal immune function, and for skin, hair and nails. Men need 11 mg a day and women 8 mg, and most people get it from meat, seafood and fortified cereals. Keep the total under 40 mg a day.^1,2,3

Key facts

Three ounces of raw farmed oysters have 32 mg of zinc, more than any other food per serving.¹
About 15% of US adults take in less zinc than the estimated average requirement.¹
Taken for weeks, 50 mg of zinc a day or more can lower the body's copper.¹
Zinc can keep some antibiotics from being absorbed, so ask a pharmacist before combining them.²

What zinc does

Zinc is needed for the activity of hundreds of enzymes.¹

Zinc works inside cells all over the body. It takes part in making proteins and DNA, in cell signaling and cell division, and in normal growth during pregnancy, childhood and the teen years.¹

Zinc is involved in the sense of taste, and running short of it can dull taste and smell.^1,2

The body holds about 1.5 g of zinc in women and 2.5 g in men, mostly in muscle and bone.¹

As zinc intake rises, the total amount absorbed goes up, but the share absorbed from each dose falls.¹

What the evidence shows

Each claim below is graded and shows the amount behind it. Four describe jobs zinc does when you get enough of it, and the fifth is about filling a shortfall. None is about taking extra once your needs are met.

Contributes to the normal function of the immune system*^1,3,4

Moderate evidence

A well-established nutrient function. NIH describes zinc as needed for lymphocytes, the immune cells that respond to specific germs, to form, mature and become active, and for the activity of other immune cells. EU regulators permit this wording for foods that are at least a source of zinc. It is about getting enough: NIH notes that when people are not short of a nutrient, routine supplements probably add little.

Amount studied: Recommended intake: 11 mg a day for men and 8 mg for women, from food and supplements

Contributes to the maintenance of normal skin, hair and nails*^1,3

Moderate evidence

A well-established nutrient function. EU regulators permit these three statements, after EFSA review, for foods that are at least a source of zinc, and NIH lists skin among the tissues affected when zinc runs short. The claim describes what the body needs zinc for. It does not show that extra zinc changes skin, hair or nails in someone who already gets enough.

Amount studied: Recommended intake: 11 mg a day for men and 8 mg for women, from food and supplements

Contributes to normal protein and DNA synthesis, and has a role in cell division*^1,2,3

Moderate evidence

A well-established nutrient function. NIH describes zinc as part of protein and DNA synthesis and of cell signaling and division, and as needed for normal growth during pregnancy, childhood and the teen years. EU regulators permit matching statements for foods that are at least a source of zinc.

Amount studied: Recommended intake: 11 mg a day for men and 8 mg for women, from food and supplements

Contributes to the protection of cells from oxidative stress*³

Moderate evidence

A nutrient function accepted by EU regulators after EFSA review, for foods that are at least a source of zinc. NIH's fact sheets describe zinc's roles in enzymes and the immune system but do not discuss this one directly, so it rests on the EU assessment. It describes a normal function, not a measured health outcome.

Amount studied: Recommended intake: 11 mg a day for men and 8 mg for women, from food and supplements

Helps you reach the recommended daily zinc intake when food falls short*^1,2,4

Moderate evidence

Most people in the United States get enough zinc from food, but national survey data from 2005 to 2016 show that 15% of adults take in less than the estimated average requirement. Teenage girls (20.9% below it), older adults, people who are pregnant and people who eat no meat are more likely to fall short. NIH says people who follow vegetarian or vegan diets might benefit from zinc supplements.

Amount studied: Recommended intake: 11 mg a day for men and 8 mg for women, from food and supplements

How much you need

Adult men need 11 mg of zinc a day and adult women 8 mg, from food and supplements combined.^1,2

Zinc for adults, per day¹
Who	Recommended	Upper limit, all sources
Men	11 mg	40 mg
Women	8 mg	40 mg
Pregnancy	11 mg	40 mg
Breastfeeding	12 mg	40 mg

The zinc upper limit counts every source, food and medicines included. Food alone rarely supplies as much as 50 mg a day, so the limit matters most for people who take more than one product with zinc. If that is you, add up the amounts on the labels.^1,2

Where zinc comes from

Oysters have more zinc per serving than any other food. Meat, fish and other seafood are the richest sources, eggs and dairy products add some, and fortified breakfast cereals are a major source in the US diet.¹

Beans, nuts and whole grains contain zinc, but their phytates reduce how much is absorbed. Fruits and vegetables contain very little zinc.¹

People who eat no meat usually take in less zinc and have lower blood zinc than people who eat animal foods.¹

Forms in supplements

Zinc sulfate, zinc acetate and zinc gluconate are common in supplements. NIH says it is not clear whether one form is better than the others.^1,2

In a crossover study of 15 healthy adults given 10 mg of zinc without food, about 61% was absorbed from zinc citrate and from zinc gluconate, and about 50% from zinc oxide. Three people absorbed little or none of the oxide.^1,5

Supplement Facts panels give the amount of elemental zinc, the zinc itself, not the weight of the whole compound.¹

What's in ours

What’s in ours

Men's Multi: Zinc, 15 mg per serving, from the label
Immune Support: Zinc, 11 mg per serving, from the label

Side effects, medicines, and who should ask first

Too much zinc can cause nausea, vomiting, loss of appetite, stomach cramps, diarrhea and headaches. Dizziness has also been reported.^1,2,4

Taking 50 mg of zinc a day or more for weeks can block copper absorption and lower copper status, reduce immune function and lower HDL cholesterol.^1,2

The upper limit for adults is 40 mg of zinc a day from all sources: food, drinks, supplements and medicines, including during pregnancy and breastfeeding. It is 34 mg for teens aged 14 to 18 and lower for children. It is set to protect copper status and does not apply to people given zinc as medical treatment by a doctor.^1,2

Ask your pharmacist how far apart to take them

Quinolone antibiotics such as ciprofloxacin and levofloxacin, and tetracycline antibiotics such as tetracycline, can bind zinc in the gut, so less of both may be absorbed when they are taken close together. NIH advises taking them apart, and the ciprofloxacin, levofloxacin and tetracycline labels list zinc among the products that reduce absorption.^1,2,6,7,8,9

On the medicine's label

Ask your pharmacist how far apart to take them

Zinc can reduce how much penicillamine is absorbed and how well it works. NIH advises taking them apart, and the penicillamine label says to take it apart from zinc and iron products and not to give mineral supplements.^1,2,10

On the medicine's label

Your doctor may want to check on you

Thiazide diuretics such as hydrochlorothiazide and chlorthalidone increase the zinc lost in urine, and taking them for a long time might lower the body's zinc.^1,2

Reported in studies

Ask first if you have Crohn's disease, ulcerative colitis or celiac disease, or have had weight loss surgery. These can lower zinc absorption and raise losses²
Ask first if you are pregnant or nursing
Ask first if you plan to take more than 40 mg of zinc a day¹

Questions people ask

What does zinc do for skin?

Skin needs zinc, and NIH lists skin among the tissues affected when zinc runs short. EU regulators accept that zinc contributes to the maintenance of normal skin. That is about getting enough, not about extra zinc changing skin that is already normal.^1,3

Is zinc oxide a poor form?

It is absorbed somewhat less well than citrate or gluconate when taken without food, and a few people in one study absorbed almost none of it. Labels list elemental zinc, so compare the milligrams and the form.^1,5

Do men need more zinc than women?

Yes. Men need 11 mg a day and women 8 mg. Men also eat more of it on average: about 13 mg a day from food, against 9.2 mg for women.¹

Can you take too much zinc?

Yes. The adult upper limit is 40 mg a day from all sources. Too much causes nausea and stomach upset, and 50 mg a day or more for weeks can lower copper.¹

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Sources

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.