How much zinc do you need per day?

The RDA for zinc is 11 mg a day for adult men and 8 mg for adult women, 11 mg in pregnancy and 12 mg when breastfeeding.

These are the reference amounts used on US food labels and in dietary guidance, not personal targets. What you need shifts with age, pregnancy, medication and health conditions. The % Daily Value shown on every food page here is calculated against the FDA Daily Value for zinc, which is 11 mg a day.

What this means for you

Eleven milligrams a day for men, eight for women. If you eat meat or seafood, this is not something you need to think about. A 3 oz portion of cooked beef short ribs is about 10 mg by itself. Oysters sit in a category of their own, six medium ones carrying 33 mg, which is three days in one plate.

The group that should pay attention is people eating mostly plants. The reason is not that plant foods lack zinc. Legumes and whole grains have plenty of it. The problem is that the same phytates that bind iron also bind zinc, and bound zinc does not get absorbed. Two people can eat the same number of milligrams and end up with different amounts inside them, depending on what else was on the plate. A cup of baked beans reads 13.5 mg on paper. How much of that reaches you is another question.

If you eat little or no meat

The size of the gap is worth seeing before you worry about it. Across 26 studies comparing habitual vegetarians with everyone else, vegetarians took in 0.88 mg less zinc a day and carried measurably less zinc in their blood. The gap was wider in women, in vegans and in poorer countries. Under a milligram of intake is not much on its own. What it tells you is that the shortfall here is about absorption rather than about the food being empty.

Soaking, sprouting and leavening do cut phytate down, and the section below explains why that turned out to matter less than everyone assumed. Sesame, pumpkin seeds and cashews are dense sources worth building in. Beyond that, this is one of the few places on this site where a modest supplement is a reasonable answer rather than a reflex.

Where eleven milligrams came from

Nobody fed people eleven milligrams and watched what happened. The figure was built. A review of 94 studies in children put two numbers on the table to calculate from: roughly 27 per cent of the zinc in food is absorbed, and the body loses about 17 micrograms per kilogram of body weight a day in urine. Work out what has to be replaced, divide by the share that gets in, and a recommendation falls out the other end. That is a fair way to set one. It is a calculation, and the studies behind it disagreed with each other enormously.

Unsettled. The blood test underneath this is weak too. When trials and observational studies were pooled, doubling how much zinc a person eats moved the zinc in their blood by about 6 per cent. A measurement that barely shifts when intake doubles cannot tell you whether your intake is enough, and the authors of that analysis finish by saying plainly that whether it can be used to set a daily figure is still being argued about. Eleven milligrams is a reasonable target standing on soft ground.

Not for everyone. The upper limit is 40 mg a day and it is not decorative. Taking 50 mg or more for weeks, which people do as a general immune measure, interferes with copper absorption, lowers HDL cholesterol and can weaken immune function. That is the opposite of the intention.

One practical detail if you take both minerals. An iron supplement of 25 mg or more taken at the same time as zinc reduces how much zinc you absorb. Put a few hours between them.

Real deficiency shows up as slow wound healing, frequent infections and appetite loss, and in older adults as changes in thinking and mood. In children it costs growth. None of that is subtle once it is established, and none of it is specific either, which is a roundabout way of saying that the answer to "am I low in zinc" almost never comes from reading a symptom list.

How many people are actually below the line

Two answers circulate and they are very far apart. Against the 11 mg Daily Value on labels, 68.6 per cent of American adults fall below it, and among women 79.4 per cent. Against the actual requirement the Daily Value is built out of, it is 39.8 per cent of women aged 19 to 30 and 43.4 per cent of men the same age. Among women over 70 it is 45.3 per cent against 82.5 per cent by the other yardstick. Median intake is 8.66 mg a day, 10.05 for men and 7.65 for women.

Nearly seven in ten against about four in ten, from the same survey and the same dinners. The Daily Value is deliberately set to cover almost everybody, including the people who need the most, so sitting under it is an ordinary place to be. Four in ten below the requirement is still a real number, and it is the one worth carrying around.

Zinc and food work against each other

Established. In Nigerian children studied with tagged zinc, absorption was 16.2 per cent when the zinc came with a meal and 63.4 per cent when it came without one. Nearly fourfold, and in the direction most people guess wrong. Calcium in the same study went the opposite way, 61.3 per cent with a meal against 27.8 without.

Not for everyone. That is not a reason to start taking zinc on an empty stomach. Zinc on an empty stomach is a well-known cause of nausea, and the people measured were children being investigated for rickets rather than adults choosing a supplement. What the finding explains is why a capsule swallowed with dinner does less than its label implies. If you are taking zinc on somebody's advice, the timing is a question for them. For most readers the answer stays what it was, which is that food beats a capsule.

Most people who think about zinc at all are thinking about colds, and the two questions are worth keeping apart. The requirement above is about the body's ordinary work. The cold research is about short courses at doses many times higher.

The 2024 Cochrane review puts numbers on both. Zinc taken to treat a cold shortened it by 2.37 days, on low-certainty evidence with very high variation between trials. Zinc taken every day to prevent colds gave a risk ratio of 0.93, which is not a reduction you could feel. And treatment raised non-serious side effects by about a third. Short course when it starts, no daily habit through the winter: the review of both is here.

For scale, since the numbers sit oddly together. The daily requirement is 11 mg for men and 8 for women. The upper limit for regular use is 40. The lozenge trials that shortened colds used between 45 and 276 mg a day for up to three weeks. A short deliberate course above the ceiling is not the same thing as a daily habit above it.

One use of zinc has evidence that has nothing to do with colds. In seven studies of people with pressure sores, zinc supplements improved healing by about 44 per cent against usual nutrition care. That is a hospital setting with a measured deficiency risk, not an argument for taking zinc because a scratch is slow to close.

Written from the evidence cards and the data on this page, then checked back against the sources. Bioma Learn has no human medical reviewer at this time and we say so rather than invent one. Information, not medical advice. How we verify.

Foods highest in zinc on this site

• Oyster, eastern, wild, raw — 33 mg per 6 medium (300% DV)
• Beans, baked, canned, with pork and tomato sauce — 13.5 mg per 1 cup (123% DV)
• Sesame seed kernels, toasted — 13.1 mg per 1 cup (119% DV)
• Sesame seeds, whole, dried — 11.2 mg per 1 cup (101% DV)
• Beef, chuck, short ribs, cooked — 10.2 mg per 3 oz (92% DV)

All zinc sources ranked →

Full guide: Zinc: the cold remedy that partly works, and the supplement that backfires