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Zinc Benefits: Immunity, Skin and the Signs You're Running Low

Zinc Benefits: Immunity, Skin and the Signs You're Running Low

Jul 13, 2026

wasim akram

Zinc is one of those minerals that sits quietly behind dozens of processes your body runs every day immune cells, skin repair, DNA copying, hormone production, wound healing yet most people never think about it until something goes wrong.

It is the second most abundant trace mineral in the body after iron, present in every cell, and involved in the activity of more than 300 enzymes. Unlike iron or calcium, the body has no dedicated zinc storage system. That means it depends on a reasonably consistent supply from food and if that supply falls short, the effects can show up across a surprisingly wide range of body systems.

Here is what zinc actually does, what the signs of running low look like, and who needs to pay closest attention to their intake.

What Zinc Does in the Body

Zinc has one of the longest lists of EFSA-authorised health claims of any micronutrient a reflection of how broadly it is involved in human physiology. These are the functions for which a causal relationship between zinc intake and the outcome has been formally established:

  • Contributes to the normal function of the immune system

  • Contributes to the maintenance of normal skin

  • Contributes to normal DNA synthesis

  • Contributes to normal cell division

  • Contributes to the protection of cells from oxidative stress

  • Contributes to normal protein synthesis

  • Contributes to the maintenance of normal bones

  • Contributes to the maintenance of normal hair

  • Contributes to the maintenance of normal nails

  • Contributes to normal cognitive function

  • Contributes to the maintenance of normal serum testosterone concentrations

  • Contributes to normal fertility and reproduction

  • Contributes to normal macronutrient metabolism

  • Contributes to the reduction of tiredness and fatigue

That breadth reflects zinc's role as both a structural component of proteins and enzymes, and a signalling molecule involved in cellular communication. The three areas most frequently discussed immune function, skin health, and DNA are worth going into in more detail.

Zinc and the Immune System

Zinc is required for the development and normal function of virtually every cell involved in the immune response. This includes innate immune cells the neutrophils, macrophages, and natural killer cells that form the body's first line of defence as well as the adaptive immune cells, particularly T cells and B cells, that mount targeted responses to specific pathogens.

One of zinc's most important immune roles is in the thymus gland, where T cells mature. Zinc is required for the production of thymulin, a hormone essential for T cell maturation and activation. When zinc is inadequate, thymulin production falls and T cell function is compromised.

Zinc also regulates the production of cytokines the signalling molecules that coordinate immune responses and acts as an antioxidant cofactor in superoxide dismutase (SOD), an enzyme that protects immune cells from the oxidative stress generated by their own activity during an inflammatory response.

Even marginal zinc deficiency can impair immune function, potentially increasing susceptibility to infections, making adequate intake important for maintaining optimal immune health.

A note on colds and zinc: research into zinc and the common cold is mixed. Some trials have found that zinc lozenges, when taken shortly after symptom onset, may reduce the duration of cold symptoms but results across studies are inconsistent, the optimal dose and form are not established, and zinc is not authorised as a claim for cold prevention or treatment. Current evidence does not support routine zinc supplementation for cold prevention in well-nourished individuals.

Zinc and Skin Health

Zinc is one of only a small number of nutrients with an EFSA-authorised claim for the maintenance of normal skin and the biochemical rationale is well established.

Skin is one of the highest zinc-concentration tissues in the body. Zinc plays several roles in skin physiology: it is involved in collagen synthesis, the structural protein that gives skin its firmness and elasticity; it supports the normal turnover of skin cells; it has antioxidant properties that protect skin cells from oxidative damage; and it modulates sebaceous gland activity and the skin's inflammatory response.

Zinc deficiency has characteristic dermatological effects. The clinical signs include skin rashes particularly around the mouth, nose, eyes, and body openings (a pattern called periorificial dermatitis) dry or scaling skin, eczematous patches, and impaired wound healing. These are among the most recognisable signs of zinc deficiency in clinical practice.

Zinc's role in wound healing is well established. Zinc is required for collagen synthesis, cell proliferation, and the inflammatory and remodelling phases of healing. Chronic low zinc status is associated with delayed wound healing, and zinc deficiency impairs the healing process at each stage.

The skin–zinc connection is also why zinc is commonly discussed in the context of acne. Sebaceous glands are among the highest zinc-concentration sites in the skin, and zinc has been investigated in this context in research. However, this falls outside the scope of authorised claims, and zinc supplementation for acne should not be positioned as a treatment.

Zinc and DNA Synthesis

Every time a cell divides which happens billions of times in the body each day it must accurately copy its DNA. Zinc is required for this process through its role as a cofactor for the enzymes responsible for DNA replication and repair, including DNA polymerase.

This is why EFSA has authorised claims for zinc's contribution to both normal DNA synthesis and normal cell division and why zinc is particularly important during periods of rapid cell growth: pregnancy, childhood, adolescence, and recovery from illness or tissue damage.

Zinc's role in DNA maintenance also underlies its contribution to the protection of cells from oxidative stress. Oxidative damage to DNA is one of the mechanisms by which free radicals contribute to cellular ageing and dysfunction, and zinc's involvement in antioxidant defence including as part of superoxide dismutase helps protect genetic material from this type of damage.

Signs You May Be Running Low

Zinc deficiency exists on a spectrum. Severe deficiency producing the most dramatic clinical signs is uncommon in the UK in otherwise healthy adults. But marginal zinc deficiency, where intake is consistently below optimal without reaching the threshold for clinical diagnosis, is more widespread and more difficult to detect. Serum zinc levels are not always reliable in mild cases, as the body tightly regulates blood zinc at the expense of tissue stores.

The signs worth being aware of include:

Recurrent or slow-clearing infections. Because zinc is required for normal immune cell development and function, chronic low zinc status can manifest as more frequent infections, particularly respiratory tract infections, or infections that take longer than expected to clear.

Slow wound healing. Cuts, grazes, or skin irritations that seem to take an unusually long time to resolve can reflect inadequate zinc for the collagen synthesis and cell proliferation required at each stage of wound repair.

Skin changes. Dry, rough, or flaky skin; small, persistent rashes particularly around the face or body openings; and eczematous patches that don't respond as expected can be signs of zinc insufficiency. These are distinct from the severe periorificial dermatitis of clinical deficiency, but warrant attention.

Hair thinning or loss. Zinc contributes to the maintenance of normal hair, and low zinc status has been associated with hair shedding or thinning in the literature.

Changes in taste or smell. Zinc is involved in the sensory perception of taste and smell, and altered or reduced taste or smell sensitivity particularly a metallic or diminished taste is a recognised sign of zinc inadequacy.

Tiredness and fatigue. Zinc contributes to the reduction of tiredness and fatigue through its role in energy metabolism and immune function. Unexplained fatigue, particularly alongside other signs on this list, is worth considering in the context of zinc intake.

Nail changes. White spots on nails are commonly but incorrectly attributed to zinc deficiency they are usually caused by minor trauma. However, slow nail growth, brittle nails, or ridging can reflect zinc insufficiency over time.

If you are experiencing several of these signs persistently, speak to your GP. A blood test can measure serum zinc levels, though interpretation requires clinical context as serum levels do not always reflect whole-body zinc status.

Who Is Most at Risk of Low Zinc Intake?

People following plant-based diets. This is the most relevant risk factor for many UK consumers. Plant foods that are high in zinc wholegrains, legumes, nuts, and seeds also tend to be high in phytates, compounds that bind zinc in the gut and significantly reduce how much is absorbed. The bioavailability of zinc from vegetarian and vegan diets is estimated to be around 25–35% lower than from omnivorous diets. Some guidance suggests vegetarians and vegans may need to consume approximately 50% more zinc than the standard recommendation to achieve comparable zinc status, though the body does adapt over time to lower zinc availability.

Older adults. Zinc absorption efficiency tends to decline with age, and dietary intake often narrows. Both factors contribute to higher rates of inadequacy in older populations.

People with digestive conditions. Conditions that reduce absorption coeliac disease, Crohn's disease, inflammatory bowel disease, and those who have had bariatric surgery are associated with significantly elevated rates of zinc deficiency. Studies have found zinc deficiency in up to 45–50% of people with Crohn's disease.

Pregnant and breastfeeding women. Zinc requirements increase substantially during pregnancy and lactation due to the demands of fetal development and breast milk production.

People who drink alcohol regularly. Alcohol increases urinary zinc excretion and reduces absorption, making regular alcohol consumption a consistent risk factor for lower zinc status.

The Best Food Sources of Zinc

Animal-based foods provide the most bioavailable zinc:

  • Oysters  the richest natural source, providing 16–45mg per 100g

  • Red meat (beef, lamb)  4–8mg per 100g; a 90g portion of beef provides around 4mg

  • Shellfish (crab, lobster, mussels)  3–7mg per 100g

  • Poultry 2–3mg per 100g, with dark meat providing more than breast

  • Dairy (hard cheeses, milk, yoghurt)  up to 4mg per 100g for hard cheeses

  • Eggs  approximately 1.3mg per 100g

Plant-based sources with meaningful zinc content:

  • Pumpkin seeds  approximately 7.6mg per 100g (one of the best plant sources)

  • Legumes (chickpeas, lentils, beans) 1–3mg per 100g (bioavailability reduced by phytates)

  • Wholegrains and fortified breakfast cereals

  • Tofu, tempeh, and other soy products

  • Nuts (cashews, almonds)

To improve zinc absorption from plant sources: soaking, sprouting, or fermenting legumes and grains reduces phytate content. Leavened breads (sourdough in particular) have lower phytate content than unleavened products, improving zinc availability.

Supplementing Zinc: What to Know

The UK reference nutrient intake (RNI) for zinc is 9.5mg per day for adult men and 7mg for adult women. The tolerable upper intake level is 25mg per day exceeding this consistently may interfere with copper absorption, since zinc and copper compete for the same uptake pathway.

Nyra Nutrition's Zinc 15mg provides 15mg of zinc per capsule above the RNI and well within the tolerable upper level, suited to supporting adequate intake in those who may not consistently meet their needs through diet alone. It is particularly relevant for people on plant-based diets, where zinc bioavailability from food is reduced.

If you are already meeting your zinc needs through a varied diet including regular animal-protein sources, supplementation may not be necessary. For those with limited dietary zinc or known risk factors for deficiency, a supplement at 15mg per day is a straightforward way to support adequate intake.

Frequently Asked Questions

Does zinc help with immunity?

Zinc contributes to the normal function of the immune system this is an EFSA-authorised claim, meaning the causal relationship is formally established. Zinc is required for the development and function of immune cells including T cells, natural killer cells, and neutrophils, and for the regulation of inflammatory cytokine signalling. Adequate zinc intake is important for maintaining immune function; supplementation in people who are already zinc-replete has less clear benefit.

Can zinc help with skin?

Zinc contributes to the maintenance of normal skin an EFSA-authorised claim. Zinc is involved in collagen synthesis, skin cell turnover, antioxidant defence in skin tissue, and the normal activity of sebaceous glands. Zinc deficiency has clear dermatological effects including dry or rough skin and impaired wound healing.

What are the signs of low zinc?

Common signs include recurrent or slow-clearing infections, slow wound healing, skin dryness or rashes (particularly around the face), hair thinning, altered taste or smell, fatigue, and changes in nail health. These symptoms are non-specific and can have many causes. If you experience several persistently, consult your GP for assessment.

Who is most likely to be low in zinc?

People on plant-based diets, older adults, those with malabsorption conditions (Crohn's disease, coeliac disease, or post-bariatric surgery), pregnant and breastfeeding women, and people who drink alcohol regularly are the groups at greatest risk of insufficient zinc intake or absorption.

How much zinc should I take?

The UK RNI is 9.5mg per day for men and 7mg for women. Supplemental doses of 15mg are commonly used and are well within the tolerable upper intake level of 25mg. Taking significantly more than 25mg daily on a sustained basis can interfere with copper absorption and should only be done under medical supervision.

Can I take too much zinc?

Yes. The tolerable upper intake level is 25mg per day from supplements. Sustained intake significantly above this level can cause copper deficiency, which can lead to anaemia and neurological problems. Zinc and copper compete for absorption in the gut, which is why balance between the two matters.