Zinc Deficiency: Hair Loss and Slow Healing

Two of the body's most demanding everyday jobs — growing hair and closing a wound — both depend on cells dividing fast and building protein quickly, and both are among the first things to falter when zinc runs low. If you are shedding more hair than usual, noticing it grow back thin and slow, and at the same time finding that small cuts, scrapes, or surgical sites take far longer to heal than they should, low zinc is one cause worth checking. This page explains why hair and healing fail together when zinc is short, how to tell this apart from the many other common causes of hair shedding and slow wounds, when it points to zinc, and how it is confirmed and corrected.

Table of Contents

1. What It Feels Like and Looks Like
2. The Mechanism: Why Zinc Drives Hair and Healing
3. Be Honest: Many Things Cause Hair Loss and Slow Healing
4. Clues That Point Specifically to Zinc
5. What Lowers Zinc Enough to Affect Hair and Wounds
6. Getting Tested
7. Correcting Low Zinc Safely
8. When to Seek Care / Red Flags
9. Key Research Papers
10. Connections
11. Featured Videos

What It Feels Like and Looks Like

The hair complaint of zinc deficiency is usually diffuse shedding, not a bald patch. People describe finding more hair than usual on the pillow, in the shower drain, and on the brush; a ponytail that has grown noticeably thinner; and a scalp that shows through more than it used to. The hair that remains can feel dry, brittle, and slow to grow, and in more severe or prolonged deficiency the eyebrows and other body hair can thin as well. This pattern — widespread thinning rather than a sharply defined patch — is what doctors call telogen effluvium: a larger-than-normal share of hairs have been pushed prematurely out of their growing phase and into shedding.

The healing complaint runs in parallel and is just as telling. Cuts and scrapes that should scab and close in days instead stay open, weep, or scab repeatedly. Surgical incisions and dental extraction sites are slow to knit. Pressure sores, leg ulcers, and diabetic foot wounds stall and refuse to shrink. Some people notice that even minor skin injuries leave a mark for much longer than expected. When hair shedding and a stubborn, slow-to-close wound appear in the same person over the same span of weeks, that combination is more suggestive than either complaint alone.

In its most severe inherited form — a condition called acrodermatitis enteropathica, in which the gut cannot absorb zinc — the picture is dramatic and unmistakable: a classic triad of hair loss, a scaly red rash around the mouth, eyes, hands, feet and groin, and diarrhea. That syndrome is rare, but it is the clearest natural demonstration that severe zinc lack attacks hair and skin first, and it is the reason zinc is checked when an infant or child develops that combination.

Back to Table of Contents

The Mechanism: Why Zinc Drives Hair and Healing

Zinc is not a vague “good-for-you” mineral — it is a structural and catalytic part of the cell's machinery. Zinc is required by hundreds of enzymes and by a whole class of proteins called zinc-finger proteins, which fold around a zinc atom into the exact shape they need to grip DNA and switch genes on and off. Through these, zinc is essential for two processes that hair follicles and healing wounds rely on more than almost any other tissue: making new protein and dividing cells (DNA and RNA synthesis). Where cells must multiply fast and manufacture protein quickly, zinc is in heavy demand — and the two tissues that do exactly that, around the clock, are the hair follicle and the wound bed.

Hair. A scalp hair follicle is one of the most metabolically active structures in the body. During its growing (anagen) phase it churns out keratin protein and divides its matrix cells continuously to push the hair shaft upward, day after day for years. That relentless production needs a steady zinc supply. When zinc falls short, the follicle cannot sustain the pace; many follicles cut the growing phase short and flip prematurely into the resting/shedding (telogen) phase. Weeks later, all those hairs let go at once — the diffuse shedding of telogen effluvium. Zinc also appears to help restrain the enzymes that break down the follicle, which is part of why both too little and, separately, certain excesses disturb the hair cycle.

Healing. Closing a wound is essentially a construction project run at high speed: skin and immune cells must multiply, migrate across the gap, and lay down new collagen scaffolding. Every one of those steps leans on zinc. Zinc-dependent enzymes called matrix metalloproteinases remodel the wound; zinc is needed for the cell division that re-covers the surface; and zinc supports the immune cells that clear bacteria so the wound does not get stuck in inflammation. Take zinc away and the project slows at every stage — the wound re-epithelializes sluggishly, collagen is weaker, and infection is more likely.

An analogy. Picture zinc as the specialized tradespeople on a busy building site — not the bricks, but the skilled crews who actually assemble them and who read the blueprints (the zinc-finger proteins that read DNA). Your body runs two of its fastest, never-closing job sites: the hair follicle (which puts up a new “tower” of keratin every day) and the wound bed (an emergency rebuild). When the crew is fully staffed, both sites hum along. When zinc runs short, the body redeploys its limited crews to the jobs it judges most urgent for survival — and cosmetic hair growth and the leisurely finishing of a wound are exactly the projects that get downsized first. So the towers stop going up (hair sheds) and the emergency rebuild drags on (wounds won't close) — not because the materials vanished, but because the workforce that assembles them is spread too thin.

Back to Table of Contents

Be Honest: Many Things Cause Hair Loss and Slow Healing

It is important to be straight about this: hair loss and slow healing are not unique to zinc deficiency, and in fact zinc is far from the most common cause of either. A normal scalp sheds 50–100 hairs a day, and shedding waxes and wanes with the seasons and with life stress. Most people who notice more hair in the drain do not have low zinc. Treating zinc as the automatic answer — or worse, taking high-dose zinc on a hunch — can both miss the real problem and cause harm (see correcting). The honest list of common causes you should weigh includes:

Other causes of diffuse hair shedding:

• Telogen effluvium from a trigger — childbirth, a major illness or fever, surgery, rapid weight loss or crash dieting, a new medication, or severe psychological stress will push hairs into shedding about 2–3 months later. This is the single most common reason for sudden diffuse shedding and usually recovers on its own.
• Thyroid disease — both an under- and over-active thyroid thin the hair; see endocrine conditions.
• Iron deficiency — low iron stores (low ferritin) are a classic, very common driver of diffuse shedding, especially in menstruating women; see iron.
• Androgenetic (pattern) hair loss — the gradual, genetically driven thinning at the crown and hairline. This is a different process from a nutrient-related shed, though they can coexist.
• Other nutrient shortfalls — low protein intake, or low vitamin D, biotin, or selenium (note: too much selenium also causes hair loss). Autoimmune patchy loss (alopecia areata) is yet another distinct cause.

Other causes of slow or stalled wound healing:

• Diabetes and poor circulation — high blood sugar and reduced blood flow are the leading causes of chronic, non-healing wounds (especially on the feet); see diabetes.
• Pressure, ongoing trauma, or infection in the wound, and venous leg disease.
• Overall malnutrition or low protein — the body cannot rebuild tissue without raw materials; vitamin C and vitamin A shortfalls also impair healing.
• Medications such as steroids and chemotherapy, and simply older age, which slows healing on its own.

The takeaway is not that zinc never matters — it clearly does — but that a single symptom is not proof. Zinc earns serious consideration when the picture fits, which is what the next section is about.

Back to Table of Contents

Clues That Point Specifically to Zinc

Because hair shedding and slow healing each have many causes, zinc moves up the list when several supporting features line up at once:

• The two problems travel together. Hair shedding and stubborn wounds appearing over the same weeks is more suggestive than either alone, because zinc is one of the few single factors that hits both fast-dividing tissues simultaneously.
• There are skin and mouth signs too. A scaly or eczema-like rash around the mouth, eyes, hands, feet, or groin; cracks at the corners of the mouth; or recurrent skin rashes alongside the hair and wound changes point toward zinc rather than, say, simple stress shedding.
• Taste or smell has dulled. Zinc is needed for normal taste, so a blunted sense of taste and smell in the same person is a useful zinc-specific clue.
• Frequent infections. Catching every cold, slow recovery from infections, or generally weakened immunity fits the zinc picture, since zinc is central to immune cell function.
• There is a reason zinc would be low. A gut disease, bariatric surgery, heavy alcohol use, a strict plant-based diet without attention to zinc, or long-term diarrhea (see causes) makes a real deficiency far more plausible.

When only one of these is present — for example, isolated shedding after a stressful few months with no skin signs, normal healing, and no risk factor — zinc is a less likely culprit, and iron, thyroid, and ordinary telogen effluvium deserve attention first. The point of these clues is to help you and your clinician decide whether a zinc level is worth checking, not to diagnose yourself from symptoms alone.

Back to Table of Contents

What Lowers Zinc Enough to Affect Hair and Wounds

True zinc deficiency severe enough to thin hair or stall healing rarely appears out of nowhere in a well-nourished person. It usually reflects one of a handful of situations that either reduce intake, block absorption, or increase losses:

• Poor intake / diet pattern. Zinc is most available from oysters, red meat, and other animal foods. Diets very low in these — including some poorly planned vegetarian and vegan diets — can fall short, especially because plant compounds called phytates (in whole grains and legumes) bind zinc and reduce how much is absorbed. Globally, inadequate zinc intake is common, and dietary surveys estimate it affects a substantial share of the world's population, concentrated where diets are cereal-based.
• Gut disease and malabsorption. Crohn's disease, celiac disease, and other causes of intestinal inflammation or malabsorption reduce zinc uptake. So does bariatric (weight-loss) surgery, which bypasses part of the absorbing intestine.
• Ongoing losses. Chronic or severe diarrhea drains zinc directly — a vicious cycle, since zinc deficiency also worsens diarrhea. Extensive burns and large draining wounds lose zinc too.
• Alcohol use disorder. Heavy alcohol intake both reduces zinc absorption and increases its loss in the urine, and it often travels with a poor diet — a common real-world cause of deficiency.
• Higher demand. Pregnancy and lactation, infancy and rapid childhood growth, and the inherited disorder acrodermatitis enteropathica (a defect in the ZIP4 zinc transporter that cripples intestinal zinc absorption) all raise the risk. Premature infants are born with low zinc stores.
• Too much of a competing mineral. Very high copper intake competes with zinc, and — the more common scenario — chronic high-dose zinc supplementation can itself drive a copper deficiency, which independently causes anemia and neurological problems. The two minerals must stay in balance.

Recognizing which of these applies matters, because the fix differs — planning a diet, treating a gut disease, or stopping an excess all lead to different next steps.

Back to Table of Contents

Getting Tested

The blood test is a serum (or plasma) zinc level, drawn from a routine venous sample. It is the standard first measure, but it has real limitations that are worth understanding so the result is interpreted sensibly:

• Serum zinc is an imperfect marker. Only a small fraction of the body's zinc circulates in the blood, and the level is influenced by factors that have nothing to do with body stores. It drops during any acute illness or inflammation (zinc shifts into tissues), falls after meals, and varies with the time of day. A blood draw is best done fasting and in the morning, and a borderline-low value during an infection should be rechecked when the person is well.
• It can miss mild deficiency. Because the body defends the blood level, serum zinc can read normal even when tissue stores are modestly low. A normal result does not entirely rule out a zinc-related problem, and clinicians weigh it against the whole picture.
• Context tests help. Because so many things mimic zinc deficiency, a sensible work-up for hair shedding and slow healing usually checks the common culprits too — iron studies and ferritin, thyroid function, and sometimes vitamin D and an albumin/protein status. A Comprehensive Metabolic Panel screens kidney and liver function and blood sugar (relevant to diabetic wound healing), and a copper level is wise if high-dose zinc has been taken.

A practical and sometimes telling test is the response to correction: when zinc deficiency truly is the cause, addressing it tends to halt the excess shedding and improve healing over the following weeks to months — though hair regrowth, in particular, is always slow because hair grows only about a centimeter a month. The authoritative NIH Office of Dietary Supplements zinc fact sheet and the Linus Pauling Institute are good plain-language references on testing and requirements.

Back to Table of Contents

Correcting Low Zinc Safely

If a genuine deficiency is confirmed (or strongly suspected with a clear cause), the goal is to restore zinc steadily while fixing whatever drained it — not to megadose. The approach, in order:

• Food first. The most reliably absorbed dietary zinc comes from animal foods. Practical, zinc-rich choices include beef and other red meat, shellfish (oysters are the richest natural source), poultry, eggs, and dairy, plus plant sources such as pumpkin seeds, legumes, nuts, and whole grains. With plant sources, soaking, sprouting, or fermenting grains and legumes lowers their phytate content and meaningfully improves zinc absorption. See the zinc food sources page for a fuller list.
• Oral zinc supplements, when needed and dosed sensibly. Forms such as zinc gluconate, sulfate, picolinate, or acetate are used to correct a documented deficiency, usually for a defined period and ideally guided by a clinician. They are best taken between meals (food, especially phytate-rich food, lowers absorption), but if they upset the stomach they can be taken with a little food.
• Respect the upper limit — this is the important caution. The U.S. tolerable upper intake level for adults is 40 mg/day of zinc from supplements, and routinely exceeding it carries a specific, well-documented danger: copper deficiency. Chronic high-dose zinc blocks copper absorption and can cause anemia and irreversible nerve damage. This is why “more is better” is wrong for zinc, why open-ended high-dose use is discouraged, and why a copper level is checked in anyone on long-term zinc. Short-term lozenges for a cold are different from months of high-dose tablets.
• Treat the underlying cause. Replacing zinc without managing the gut disease, alcohol use, or dietary gap that caused the shortfall only buys time. In acrodermatitis enteropathica, lifelong zinc supplementation is the treatment, and it reverses the hair, skin, and bowel signs — a striking confirmation of zinc's role.
• Be patient about hair. Even when everything is corrected, visible hair recovery takes months, because the shed hairs must re-enter the growing phase and then grow out. Slowing the shedding is the first sign of progress; thickness returns later. There is no evidence that taking extra zinc beyond correcting a deficiency grows more hair — and excess can itself trigger shedding.

Back to Table of Contents

When to Seek Care / Red Flags

Hair shedding and a slow wound are usually not emergencies, and most cases are sorted out calmly with a clinician. But certain features mean you should be evaluated promptly rather than self-treating with supplements:

• A wound that is clearly infected — spreading redness, increasing warmth, swelling, pus, a foul smell, red streaks running from it, or fever. Infected wounds need medical care, not zinc.
• Any non-healing foot wound or ulcer in a person with diabetes or poor circulation — these can deteriorate quickly and warrant urgent attention.
• A wound that will not close after several weeks despite good basic care, or one that keeps breaking down.
• Rapid, dramatic hair loss, hair coming out in distinct patches (which suggests alopecia areata or another scalp condition rather than a nutrient shed), or hair loss with a scaly, scarring, or inflamed scalp.
• Hair loss with other systemic symptoms — unexplained weight change, fatigue, cold or heat intolerance, or a persistent rash — which may point to thyroid disease, a nutritional disorder, or another illness.
• The classic zinc-deficiency triad in an infant or child — hair loss with a rash around the mouth and the hands/feet plus diarrhea — which needs prompt medical assessment for acrodermatitis enteropathica or another cause of severe deficiency.
• Symptoms of copper deficiency from over-supplementing zinc — new numbness, tingling, unsteadiness, weakness, or unexplained anemia in someone taking high-dose zinc. Stop and seek care.

Most importantly: do not treat hair loss or a slow wound with high-dose zinc on your own for weeks or months. A simple blood test can confirm whether zinc is actually the problem, and unsupervised high-dose zinc can create a new and more serious deficiency. For a broad overview of the symptom, see hair loss.

Back to Table of Contents

Key Research Papers

1. Prasad AS (2013). Discovery of Human Zinc Deficiency: Its Impact on Human Health and Disease. Advances in Nutrition;4(2):176-190. — DOI: 10.3945/an.112.003210
2. King JC (2011). Zinc: an essential but elusive nutrient. American Journal of Clinical Nutrition;94(2):679S-684S. — DOI: 10.3945/ajcn.110.005744
3. Wessells KR, Brown KH (2012). Estimating the Global Prevalence of Zinc Deficiency: Results Based on Zinc Availability in National Food Supplies and the Prevalence of Stunting. PLoS ONE;7(11):e50568. — DOI: 10.1371/journal.pone.0050568
4. Wieringa FT, Dijkhuizen MA, Fiorentino M, et al. (2015). Determination of Zinc Status in Humans: Which Indicator Should We Use? Nutrients;7(5):3252-3263. — DOI: 10.3390/nu7053252
5. Kil MS, Kim CW, Kim SS (2013). Analysis of Serum Zinc and Copper Concentrations in Hair Loss. Annals of Dermatology;25(4):405-409. — DOI: 10.5021/ad.2013.25.4.405
6. Park H, Kim CW, Kim SS, Park CW (2009). The Therapeutic Effect and the Changed Serum Zinc Level after Zinc Supplementation in Alopecia Areata Patients Who Had a Low Serum Zinc Level. Annals of Dermatology;21(2):142-146. — DOI: 10.5021/ad.2009.21.2.142
7. Jin W, Zheng H, Shan B, Wu Y (2017). Changes of serum trace elements level in patients with alopecia areata: a meta-analysis. The Journal of Dermatology;44(5):588-591. — DOI: 10.1111/1346-8138.13705
8. Maverakis E, Fung MA, Lynch PJ, et al. (2007). Acrodermatitis enteropathica and an overview of zinc metabolism. Journal of the American Academy of Dermatology;56(1):116-124. — DOI: 10.1016/j.jaad.2006.08.015
9. Wang K, Zhou B, Kuo YM, Zemansky J, Gitschier J (2002). A Novel Member of a Zinc Transporter Family Is Defective in Acrodermatitis Enteropathica. The American Journal of Human Genetics;71(1):66-73. — DOI: 10.1086/341125
10. Lin PH, Sermersheim M, Li H, et al. (2018). Zinc in Wound Healing Modulation. Nutrients;10(1):16. — DOI: 10.3390/nu10010016
11. Lansdown ABG, Mirastschijski U, Stubbs N, Scanlon E, Ägren MS (2007). Zinc in wound healing: theoretical, experimental, and clinical aspects. Wound Repair and Regeneration;15(1):2-16. — DOI: 10.1111/j.1524-475X.2006.00179.x
12. Arribas López E, Zand N, Ojo O, et al. (2025). Systematic review and meta-analysis of the effect of zinc on wound healing. BMJ Nutrition, Prevention & Health;8(1):306-313. — DOI: 10.1136/bmjnph-2024-000952

PubMed Topic Searches

• PubMed — Zinc deficiency, telogen effluvium, and hair loss
• PubMed — Serum zinc and zinc supplementation in alopecia areata
• PubMed — Zinc and wound healing
• PubMed — Acrodermatitis enteropathica and zinc
• PubMed — Zinc supplementation and copper deficiency

Back to Table of Contents

Connections

• Zinc Deficiency Hub
• Zinc Deficiency and Weakened Immunity
• Zinc Deficiency and Loss of Taste & Smell
• Zinc Deficiency and Skin Rashes & Acne
• Zinc Overview
• Zinc Toxicity (Excess)
• Zinc and Wound Healing
• Zinc and Skin Health
• Zinc Food Sources
• Copper
• Iron
• Selenium
• Comprehensive Metabolic Panel
• Alopecia Areata
• Hair Loss
• Diabetes
• Crohn's Disease
• Celiac Disease
• Beef
• Pumpkin Seeds

Back to Table of Contents

Featured Videos

×