Zinc for Women: Are There Special Considerations?

Zinc is usually marketed to men, often in connection with testosterone. Yet women need it just as much for immunity, skin, reproduction and recovery from exercise, and some women are at higher risk of falling short. Our editors look at what is truly different about zinc for women and what is simply marketing.

Why zinc matters

Zinc is an essential trace mineral, meaning the body cannot make it and has no large storage depot. It is a cofactor for hundreds of enzymes involved in DNA synthesis, protein production, wound healing and the antioxidant defense system.

The immune system is particularly dependent on zinc. Even mild deficiency can impair the function of T cells and other immune cells, which may help explain why low zinc status is linked to more frequent infections.

Zinc also plays roles in taste and smell, skin integrity, thyroid hormone metabolism and the reproductive system. In women, it participates in ovulation and the normal function of the menstrual cycle.

For active women, zinc supports the repair of tissues damaged during training and is lost in small amounts through sweat. Endurance athletes training in hot conditions may therefore lose somewhat more than sedentary peers.

How much women need

In the United States, recommended intakes come from the Dietary Reference Intakes developed by the National Academies. The Recommended Dietary Allowance (RDA) for adult women is lower than for men, mainly due to body size differences.

The upper limit of 40 mg per day applies to total intake from food, fortified products and supplements combined. Many zinc supplements contain 25–50 mg per tablet, so it is easy to exceed this amount without realizing it.

These values assume a mixed diet. For people who eat mostly plant foods, the National Academies noted that requirements may be as much as 50% higher because of lower absorption.

Life stages and situations that change the picture

Pregnancy and breastfeeding increase needs, as zinc supports fetal growth and is secreted into breast milk. A Cochrane review found that zinc supplementation in pregnancy was associated with a small reduction in preterm birth, mainly in low-income settings, though it did not affect most other outcomes.

Plant-based diets are a common reason for low intake among women. Whole grains, legumes and seeds contain zinc, but they also contain phytates that bind it and reduce absorption. Soaking, sprouting, fermenting and leavening reduce phytate content.

Oral contraceptives have been associated with modestly lower blood zinc levels in some studies, although the clinical significance is uncertain. Women with heavy menstrual bleeding often focus on iron, but their overall diet quality can affect zinc too.

Restrictive eating and low energy availability, which are more common among female athletes in aesthetic and weight-class sports, reduce intake of many micronutrients at once. Zinc deficiency in this setting is a symptom of a wider nutritional problem rather than an isolated issue.

Zinc, iron, and copper: managing interactions

Many active women take iron supplements, and this is where zinc gets tricky. High doses of iron and zinc taken together can compete for absorption. If both are needed, taking them at different times of day is a common practical approach.

Long-term high zinc intake interferes with copper absorption. Copper deficiency can cause anemia and neurological problems, and cases have been reported in people taking large amounts of zinc for months, including from denture creams containing zinc.

1. Check whether your multivitamin already contains zinc before adding a separate product.
2. If you take iron, separate it from zinc supplements by a few hours.
3. Avoid long-term zinc intake above 40 mg per day unless prescribed.
4. For short-term use, such as zinc lozenges during a cold, follow label directions and stop after a few days.

Some evidence suggests zinc lozenges started early may shorten the duration of a common cold. Results differ between products and formulations, and side effects such as nausea and an unpleasant taste are common.

Food first, then supplements

Oysters are by far the richest source of zinc. Red meat, poultry, crab, lobster, fortified breakfast cereals, beans, pumpkin seeds, cashews and dairy products also contribute meaningful amounts.

Most women in the US who eat a varied diet including animal foods meet the RDA without supplements. Women who are vegan, pregnant, in heavy training with restricted intake, or who have digestive conditions affecting absorption are the main groups who may benefit from a targeted supplement.

Common supplement forms include zinc gluconate, citrate, picolinate and sulfate. Differences in absorption between forms exist but are relatively small compared with the effect of dose and dietary context.

Zinc is not prohibited in sport. As with any supplement, competitive athletes should choose third-party tested products. Blood zinc tests have limited accuracy for detecting mild deficiency, so dietary assessment by a registered dietitian is often more informative.

Editorial Team Conclusions

Women need zinc for the same core reasons men do, but their RDA is slightly lower and rises during pregnancy and breastfeeding.

The groups most at risk of shortfall are plant-based eaters, women with restricted energy intake and those with absorption problems. For most others, food provides enough.

When supplementing, respect the 40 mg upper limit, separate zinc from iron, and remember that excess zinc can cause copper deficiency.

Next, you might read our guides on iron status in female athletes, magnesium and sleep, and how to build a well-planned vegan sports diet.

References

1. Institute of Medicine (US) Panel on Micronutrients. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington (DC): National Academies Press; 2001.
2. Prasad AS. Zinc in human health: effect of zinc on immune cells. Mol Med. 2008;14(5–6):353–357.
3. Maret W, Sandstead HH. Zinc requirements and the risks and benefits of zinc supplementation. J Trace Elem Med Biol. 2006;20(1):3–18.
4. Saunders AV, Craig WJ, Baines SK. Zinc and vegetarian diets. Med J Aust. 2013;199(4 Suppl):S17–S21.
5. Ota E, Mori R, Middleton P, et al. Zinc supplementation for improving pregnancy and infant outcome. Cochrane Database Syst Rev. 2015;(2):CD000230.
6. Hemilä H. Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage. JRSM Open. 2017;8(5):2054270417694291.