Does Zinc Deficiency Cause Hair Loss? What the Latest Study Actually Found

You’ve probably already tried the obvious fixes. A gentler shampoo, a biotin gummy, maybe a dermatologist appointment that ended with a quick look at your scalp and the word “stress.” If your hair is still thinning and nobody has actually checked your minerals, there’s a real answer worth looking into: zinc.

The short version is yes, a zinc deficiency can contribute to hair loss. Zinc is essential for the basic job your hair follicles do every day, producing new cells fast enough to keep growing hair. But a large study published in late 2025 on this exact question found something most hair loss articles leave out. The gap between people with hair loss and people without it was real, but small enough that the researchers themselves said testing zinc on its own usually isn’t enough to explain what’s going on. That distinction changes how you should actually approach this, and it’s the part I want you to understand before you reach for another supplement.

Yes, Zinc Deficiency Can Cause Hair Loss, Here’s What the Research Shows

The National Institutes of Health lists hair loss directly among the documented effects of inadequate zinc intake, particularly in children, alongside slowed growth and frequent infections. Zinc plays a direct role in two things every hair follicle depends on: building keratin, the structural protein hair is made from, and dividing cells fast enough to keep producing new strands. Without enough of it, that process slows down or stalls. (Source: NIH Office of Dietary Supplements)

A 2025 cross-sectional study looked at nearly 24,000 patients and compared zinc levels between people diagnosed with hair loss and a matched group who weren’t. People with hair loss did have lower zinc, a median of 96 micrograms per deciliter compared to 99 in the control group. The difference was statistically real, but small, and both numbers sat inside what’s considered a normal range. The researchers concluded that ordering a standalone zinc test as a first step for hair loss usually isn’t worth it on its own. (Source: PubMed, 2025)

That’s not the same as saying zinc doesn’t matter. It means a single zinc number, especially one pulled in isolation during a routine blood panel, often doesn’t tell the full story. When I see clients who are already noticing the signs of an underlying zinc deficiency beyond just their hair, the more useful question isn’t whether their zinc is technically in range. It’s what else is happening alongside it.

How Zinc Actually Builds the Hair You’re Losing

I always tell clients to think of a hair follicle like a kitchen that never closes. It’s constantly producing new cells and pushing them upward to form each strand. Zinc is one of the raw ingredients that kitchen can’t run without. It helps your body make keratin, and it’s required for the rapid cell division happening at the base of every follicle, where hair growth actually starts.

Zinc also plays a role most people never connect to hair: regulating inflammation at the follicle itself and supporting the oil glands that keep the scalp from drying out. A scalp that’s chronically inflamed, even mildly, isn’t a great environment for new hair to grow in. Run low on zinc for long enough, and the kitchen doesn’t shut down completely. It just starts sending out thinner, weaker product, which shows up as increased shedding and slower regrowth.

The Mineral Almost Nobody Tests For: Copper

Here’s the part of this story that gets left out of almost every article on zinc and hair loss: zinc and copper compete for absorption in your gut. Standard guidelines cite a threshold above which zinc supplementation can interfere with copper absorption, but those thresholds are based on population averages and don’t account for what I see every day in practice: individual biochemistry varies enormously. Gut health, stress levels, methylation status, and existing mineral imbalances all affect how your body handles zinc at any given dose.

That matters because copper doesn’t quietly disappear when the balance shifts. In some people, copper builds up faster than the body clears it, a pattern known as copper toxicity, and zinc gets pulled down as a result. In others, the dynamic runs the other direction. Either way, looking at zinc by itself, the way most standard testing does, only gives you half of a two-mineral relationship. At Eat for Life, I test every client so we have a solid baseline before making any recommendations, because what’s appropriate for one person’s unique biochemistry may be completely wrong for another’s.

Postpartum Hair Shedding Is a Mineral Story Too

If you’re reading this a few months after having a baby, the timing isn’t a coincidence. Zinc needs go up during pregnancy and breastfeeding, the recommended intake climbs from 8 milligrams a day for most adult women to 11 during pregnancy and 12 while breastfeeding. At the same time, copper naturally rises during pregnancy due to hormonal shifts, and for some women it doesn’t come back down as quickly as it should after birth. (Source: NIH)

I see this pattern often in my own practice, and the team at Mensah Medical, who specialize in exactly this, have described a connection between elevated copper after childbirth and a higher likelihood of postpartum mood symptoms, often alongside the kind of zinc depletion that shows up in hair and nails first. The diffuse, all-over shedding many new mothers notice around the three to four month mark, sometimes called telogen effluvium, often has both minerals moving in the wrong direction at once. If you’ve also noticed mood shifts that don’t feel like ordinary new-parent exhaustion, I’d encourage you to look into the link between postpartum copper imbalance and depression on its own.

Other Signs Your Hair Loss Might Be a Mineral Imbalance

Hair loss tied to a zinc or copper imbalance usually doesn’t show up alone. Watch for this pattern alongside the shedding:

• Thinning that’s spread evenly across your scalp rather than a receding hairline or a single bald patch
• Hair that feels noticeably more brittle, dry, or prone to breaking than it used to
• Nails that are thin, ridged, or slow to grow
• A change in your sense of taste or smell
• Getting sick more often than usual, or wounds that take longer to heal
• New or worsening anxiety, irritability, or low mood showing up around the same time

That last one surprises a lot of my clients, but it shouldn’t. Copper toxicity’s connection to depression and anxiety is well documented, and minerals rarely stay in their own lane.

Why Testing Beats Guessing

The 2025 study’s own conclusion is worth repeating: a single zinc number from a routine blood panel often isn’t decisive enough on its own to explain hair loss. That’s not an argument for ignoring minerals. It’s an argument for testing the right things together instead of one thing in isolation.

I always recommend starting with a copper and zinc panel, since it looks at both minerals and the ratio between them, which tells you far more than either number alone. A hair elements test goes a step further, measuring mineral levels as they’ve actually been deposited into your hair over the weeks it grew, rather than a single snapshot from one blood draw. For anyone whose hair loss has stuck around for more than a few months without an obvious cause, I see that combination as a more useful starting point than another round of biotin gummies.

Zinc-Rich Foods Worth Adding

Before reaching for a supplement, it’s worth knowing what food sources actually look like. According to the NIH, zinc intake from food breaks down roughly like this:

One caveat worth knowing if you eat mostly plant-based: beans, grains, and nuts also contain phytates, compounds that reduce how much zinc your body actually absorbs from those foods. That doesn’t mean a vegetarian or vegan diet can’t meet your zinc needs, it just means the math is less straightforward than it is with animal sources.

Should You Just Take a Zinc Supplement?

Not without knowing where you’re starting from. At Eat for Life, I test every client so we have a solid baseline before making any recommendations. Although conventional guidance cites thresholds for zinc intake above which copper absorption may be affected, those numbers are population averages that don’t account for individual biochemistry. The question I always ask first is: what is your unique biochemistry? Because that is what determines your zinc requirements, not a generic baseline.

Your full biochemical profile shows whether you need zinc supplementation and, if so, the right dose and form, which is what most people miss entirely. If you haven’t tested anything yet, buying a bottle of zinc and hoping for the best is the most common mistake I see with this exact problem, and it’s the one I wrote this article to help you avoid.

Frequently Asked Questions

This article is for educational purposes and isn’t a substitute for personalized medical advice. Zinc and copper interact with each other and with certain medications, so talk with a healthcare provider or functional nutrition counselor before starting any new supplement, especially at doses above what’s found in a standard multivitamin.