Is a hair mineral test (HTMA) worth it? Minerals, heavy metals and copper: an integrative doctor's view

What is a hair tissue mineral analysis?

A hair tissue mineral analysis (HTMA) is a non-invasive test. A small sample of hair is cut close to the scalp, typically from the nape of the neck and the back of the head, and sent to a laboratory for analysis.¹ The rationale behind it uses the fact that minerals and heavy metals are built into hair as it grows. Modern instruments can then be used to measure the amount of minerals and heavy metals in your hair,^2–4 and changes in diet or supplements are often recommended afterwards.

It is sometimes claimed to provide a picture of the minerals and heavy metals in your body, and their comparative ratios. It is also often claimed to provide information about metabolic rate, energy levels and stress patterns at a cellular level. This covers roughly the past 3 to 4 months, depending on how fast the hair grows.^{5, 6}

Advocates describe hair as a chronological biological archive, a timeline of what the body has been exposed to, capturing cumulative exposure over a stable time frame and providing data that acute blood draws miss.^{2, 4, 7}

Furthermore, it is claimed to benefit screening and preventative healthcare as a functional and preventive assessment. It is said to help better understand symptoms, give a more holistic approach to remedying deficiencies or toxicities, and estimate an individual’s health and nutritional status, to help identify which nutrients may help if supplemented.^{5, 8}

It is widely used in nutritional, functional and environmental medicine, and in wellness screening.^{5, 7, 8} But just because it is widely used does not mean it should be used as a definitive tool to help patients.

The interpretive model behind these claims seems to derive from Dr Paul Eck and Dr George Watson, who spent much of their careers determining the framework for how to understand a hair tissue mineral analysis.⁹ Watson determined metabolic types using measurements such as serum dissolved carbon dioxide, serum pH, odour tests and food preference questionnaires.^{10, 11} Their framework was later taken up by commercial laboratories and the practitioners trained by them, which is how it reached most of the hair tests sold today.^{6, 12}

Interestingly, in Ayurveda, hair is seen as a by-product of bone tissue, or asthi,¹³ and in Chinese medicine, as a reflection of the kidney essence, or jing, which links greying hair to the kidney.¹⁴ I naturally see connections like these when I read the rationale of Dr Paul Eck and when I read the science, and I find them interesting. Bone, for example, needs to be mineralised,¹⁵ and the kidneys filter our minerals, guided by hormones such as aldosterone.^{16, 17} Eck and Watson’s fast and slow metabolic types also echo pitta and kapha, yang and yin, and the sympathetic and parasympathetic nervous system. But as with any doctor, I have to keep an open mind and be critical at the same time.

There is a lot of debate between natural doctors and conventional doctors about whether it can actually provide any use.

In my view, the current standard deserves the same critique as anything new, along with the evidence it is based on, because every test, whether blood, urine or hair, generates a hypothesis. That is the only way to come to a fair assessment of what is best for patients.

The first question might therefore be, how important are minerals and heavy metals for health?

Why minerals matter

At the core of all nutrition are minerals, vitamins and micronutrients. You can argue they matter as much as protein, carbohydrate and fat, or more, because the body needs them to digest, build and use all three. And they work together, not in isolation, for practically every function of the human body.

They are needed for the enzymes that digest our food and run every process in our cells,^{18, 19} for energy to be made,^20–22 for hormones to be built and run,^23–26 for nerves to signal and for muscles and the heart to contract,^{15, 27, 28} for the immune system to defend us,^{29, 30} and for the liver to detoxify what we are exposed to.^{31, 32}

Yet many of us may be short of minerals, for a number of reasons. The food that reaches our plates appears to hold fewer minerals than it did decades ago.^33–35 With the amount of fertilisers and pesticides used on our soils, some argue the soils themselves are depleted too, although this is disputed.^36–40 Processing then strips minerals out of food.^{41, 42}

In my view, a lot of people don’t have optimal digestion. And some of the most commonly prescribed medicines lower mineral and vitamin levels over months or years, such as acid-reducing medicines for magnesium, metformin for vitamin B12, and the oral contraceptive pill for zinc, magnesium and selenium.^43–45

And chemicals from the shampoo, soap, toothpaste, make-up and hair products a person uses before they have even left the house, let alone everything else we use each day, are found in many people tested.^{46, 47} The body’s systems for clearing them depend on minerals,^{30, 31} and we already know that smoking raises the need for vitamin C, and that alcohol and toxic metals drain minerals.^48–51 So it makes logical sense to me that everyday chemicals may raise our need for minerals too.

The diets of over two-thirds of the world’s population lack at least one essential mineral,⁵² and close to half of adults in the United States take in less magnesium than they need.⁵³ It is worth remembering that recommended intakes are set to meet the needs of nearly all healthy people, based mainly on preventing deficiency, while what is optimal for long-term health has never really been defined.^{54, 55}

Considering all of this, how often has an abnormality in your mineral levels come up in your blood tests? Think about the last annual blood test your doctor did. Did it show you were short of any minerals?^{19, 21, 56}

If, at a population level, our food carries fewer minerals and vitamins, should we, as healthcare practitioners, not be paying closer attention to how we optimally test for them in our patients?

Why heavy metals matter

There is no physiological use in the body for metals such as lead, cadmium, mercury, inorganic arsenic and aluminium.^{57, 58} Yet we are surrounded by them in the modern-day environment every single day: in the air we breathe, the soil our food grows in, the water we drink, the food we eat, the cosmetics we put on our face and skin, the pipes our water flows through, the paints on our walls, the toys we use, and even the household dust around us.^59–61 In the United States, lead can be measured in the blood of virtually everyone tested, and cadmium and mercury in most.⁶² Across Europe, one in six young adults tested had urinary cadmium above health alert levels.⁶³

We already have strong evidence that some toxic metals have significant health consequences, related to the heart,^{57, 64} the kidneys,⁶⁵ the brain,^{66, 67} the lungs⁶⁸ and the bones,⁶⁹ as well as diabetes and cancer,^{70, 71} and early death.⁷² Lead is stored in bone, and cadmium in the kidneys, for decades.^{73, 74} No safe level of lead has been identified,^{59, 75} and no tolerable intake has been set for lead or inorganic arsenic.^{76, 77} And toxic metals can take the place of essential minerals such as zinc, calcium and selenium inside enzymes,^{51, 78, 79} while people low in iron have been found to absorb several times more cadmium.^{50, 80}

So, considering the harm many of these metals can cause, which depends on the metal, its form and the dose,⁵⁸ and how much we are being exposed to, are we paying enough attention to environmental exposures?^{57, 81}

“When did your doctor last check you for heavy metals?”

Should we, as doctors, taking all of this into account, be testing more from a preventive perspective? And is our current level of testing enough, in your honest opinion?

Why doctors typically don’t order a hair tissue mineral analysis

Most doctors don’t order a hair mineral test because it is not recommended in guidelines. Specialists in toxicology and paediatrics advise against hair testing for general symptoms, or in children with behavioural or developmental conditions,^82–84 because of concerns about contamination, reliability, validity, interpretation and the risk of harm.⁸⁵

And in my experience, heavy metals are rarely even considered, so no test is ordered at all. As a conventional doctor, it was never something emphasised in medical school, nor in postgraduate exams. Having worked in hospitals and in general practice, I don’t remember a single time I measured lead, arsenic or copper. The one mineral that does routinely come to mind is iron, in iron deficiency anaemia. Even there, I have hesitations about the current standard, which I will write about in the future. In the chronic setting, did I ever think of cadmium, arsenic, aluminium or mercury in conventional healthcare? The honest truth is that, at best, it’s a small bullet point somewhere. It was never a core differential diagnosis for me.

The truth is, techniques for measuring minerals, metals and other substances in hair have been around for decades. Hair is now analysed in laboratory instruments called mass spectrometers.^{3, 7} It is not, however, a standard diagnostic tool in conventional medicine, and the reasons given are these:

• Contamination. Hair sits on the outside of the body, so shampoo, dye, sweat and dust can all change what is measured.^{7, 84, 86} In one study, several minerals and heavy metals rose by more than half, and one up to fivefold, along the hair shaft away from the scalp, despite washing. Results also depend on how the sample is taken and prepared. And laboratories can wash the sample in different ways, which can affect the final result.
• Reliability. There is no standardisation to ensure comparability between labs.⁸⁷ The same hair, sent to different laboratories, has come back with results differing more than tenfold, and with different advice. Identical samples have even been classified differently by the same lab.⁸⁸
• Validity. Clinically validated reference ranges for hair minerals do not exist.⁸⁹ And even where a lab measures accurately, its ranges have little demonstrated relationship to disease. Minerals in hair have been found to tell a different story from the same minerals in the blood,^90–92 and in the organs themselves.⁹³ Hair copper has been found to be normal even in Wilson disease, where the body is overloaded with copper,⁹⁴ and an expert panel found insufficient data to recommend hair zinc.⁹⁵ Hair is also unlikely to reflect very recent exposure, over hours to days, or exposure more than a year ago.⁹⁶
• Interpretation. To the best of my knowledge, the ratios used to read stress and the thyroid have yet to be tested against a blood or hormone test.⁹⁷ Laboratories define some of them differently,^{98, 99} and the methods used to interpret a hair test can vary. And the more elements and ratios a report shows, the more likely a healthy person is to come back with something flagged.¹⁰⁰ Separating what the body laid down in the hair from what landed on it from outside is “difficult, if not impossible” for airborne exposures.¹⁰¹ Commercial interpretations can be misleading,⁸⁵ and some labs have promoted their own branded supplements alongside the results.¹⁰²
• Risk of harm. And even if all of the above were rectified, they argue it can lead people to unnecessary supplements,^{103, 104} and at worst, to unnecessary chelation, treatment with drugs that bind and remove metals. This has caused deaths, including in children.¹⁰⁵

So, taking all of this into account, how can some healthcare professionals, including myself, sometimes use it as part of a wider assessment? Does this make sense?

The case for a hair mineral test: why some health practitioners use it

Those who use it give these reasons:

• Already trusted in certain settings. Hair testing is an established form of measurement in forensic medicine and drug testing,¹⁰⁶ and in monitoring environmental exposure, with standard procedures published for mercury.¹⁰⁷ Once sampling and analysis are harmonised, hair has been called an optimal biomarker for assessing mercury exposure, showing that properly controlled hair measurements can be informative. Hair is a reliable marker of methylmercury, the form of mercury found in fish, which can cause harm even in small amounts.^{67, 108} And hair cortisol, measured by a separate test, reflects the body’s stress hormone output over months.¹⁰⁹ It has even been proposed as an initial test for Cushing’s syndrome, a condition of too much cortisol.¹¹⁰
• An excretory tissue and a long-term record. It potentially makes physiological sense. Before it protrudes through the scalp, hair is exposed to blood, lymph and intracellular fluids, pulling in substances from the bloodstream. These include essential minerals like zinc, magnesium and iron, as well as toxic metals like mercury and arsenic. As the hair hardens, these substances are encased within it.^{2, 7} As it grows out, roughly a centimetre a month,⁹⁶ it becomes a potentially stable, timestamped record of exposure or nutritional status. This may be more revealing of longer-term patterns and body stores than blood and urine, which are more of an immediate snapshot.^{4, 111}
• Measurement can be reliable. The studies showing labs disagreeing are mostly old, used one or two donors, and compared labs using different methods.^{103, 104} More recent work has found consistent numbers between labs using the same method,¹⁰² and 16 of 18 labs across 17 European countries agreed on hair mercury under one shared protocol.¹¹² Within one laboratory, results have been reproducible on average.⁸⁸ Two reviews by authors affiliated with hair laboratories report that the variance between hair labs is no wider than in quality surveys of conventional tests. They add that with quality control, hair analysis can be analytically valid.^{97, 113} Independent laboratories have measured dozens of elements in hair precisely, and hair reference materials have been certified internationally.^{3, 114} Most shampoos have been found to have a negligible effect on hair minerals,¹¹⁵ and reference ranges for toxic elements based on large populations have been published.¹¹⁶
• Hair reflects the body for some minerals. Hair zinc reflects zinc status in healthy people.¹¹⁷ A randomised trial, several of whose authors work for a company developing the method, found single-hair analysis detected small changes in dietary zinc.¹¹⁸ Hair selenium closely tracks the selenium in muscle,¹¹⁹ and arsenic and selenium in washed hair still reflected the body.⁹¹ Lower hair zinc and iron have also been found in women who went on to deliver preterm.¹²⁰
• Hair changes with disease. Very low hair calcium has been found in older women with osteoporosis, and raised hair calcium and phosphorus in people with an overactive thyroid or parathyroid gland.¹²¹ A high calcium-magnesium ratio in hair has been associated with calcium build-up in the arteries of the heart,¹²² which we know in conventional medicine is a risk factor for heart attacks. A higher calcium-magnesium ratio in hair has also been linked to insulin resistance.¹²³ Hair elements such as mercury and zinc have also been associated with a number of diseases, such as autism, high blood pressure, heart attacks and breast cancer.^{8, 124–127}
• Different, not worse. Hair measures what has happened over months; blood measures one moment. So when the two disagree, the question is which one is wrong, and based on what. Why do we assume blood is the gold standard for every mineral when it comes to chronic disease? The authors of the most recent comparison, one of whom works for a hair laboratory, suggest hair may have a unique clinical use for long-term trends and imbalances.⁹⁰

Read as a supportive investigation alongside symptoms, history, clinical assessment and standard blood tests, never as a stand-alone diagnosis, they argue that it becomes useful. It can give an estimate of long-term mineral status, and potentially an early indicator of disease, once sample preparation is standardised, in particular the washing methods.

Hair, blood or urine: which test is best for minerals and heavy metals?

Each is used for different metals: blood for lead, urine for arsenic, cadmium and inorganic mercury, and hair for mercury from eating fish.^{108, 128–131} In an acute setting, measuring your magnesium, calcium, sodium and potassium in blood can save lives. In a chronic setting, we can typically measure folate and iron as well. But there are far more minerals and vitamins than these that the body needs to work well, and many heavy metals that can harm it.

Blood. When it comes to essential minerals, blood levels are easily interpretable because they are tightly regulated: the body holds them within a narrow range, so if they become dysregulated, you see it straight away.^{16, 132} But how is that helpful in the chronic setting? Blood is good at showing what’s circulating in your body now, but less helpful for exposure in the past, or over a period of time. It may not be an adequate reflection of the heavy metals sitting in the most important places in your body: your brain, your kidneys and your heart.^{128, 129, 133, 134} For example, less than one per cent of the body’s magnesium is in the blood, and the body works hard to keep the blood level stable, even when the wider stores may not be ideal.^{15, 19, 28, 135} Could a similar rationale be applied to various other minerals in the human body?²⁷

Urine. Urine is the standard test for several metals, such as arsenic, cadmium and inorganic mercury.^129–131 It is also the method of choice for the organic acids test, which I’ve described in a separate article. There is also a provoked version, where a chelator such as DMSA or EDTA is given and the urine collected afterwards, to see how much heavy metal comes out. However, specialist bodies advise against it, because chelators raise urine metals even in people who were never exposed, and no reference ranges exist for the results.¹³⁶ But logically speaking, if a chelator raises heavy metals in the urine, where are those heavy metals coming from?^{137, 138} Heavy metals have no physiological use in the body, and many cause documented harm.^{57, 58} So if they are coming out in the urine, we shouldn’t be storing them anywhere in the body. And whilst it is disputed whether this test reflects the whole body burden,^{139, 140} in the country I work in, each metal is typically tested one at a time, so this ends up very costly.

Hair. A hair tissue mineral analysis, by contrast, is claimed to measure dozens of minerals and toxic metals at once, for much less, and to reflect what is in your organs and tissues, as well as your blood.^{5, 141, 142} Methylmercury in hair holds roughly 250 times the concentration found in blood, which is why hair is used to estimate exposure.^{108, 143} Whilst this ratio can vary between people,¹⁴⁴ the question is: to what extent can we generalise this to other metals?

Therefore, considering some of the concerns raised regarding the measurement of minerals and heavy metals in the blood, urine and hair, with further study, could we end up extrapolating many of these concerns to various other minerals, vitamins and heavy metals in the body?¹⁴⁵

Compared to what? To the best of my knowledge, no study has compared hair, blood and urine against patients’ presentations, explained at a biochemical level.^{93, 133, 146} That, to me, would be the ideal study.

Therefore, I think what may be warranted in the future is for hair, blood and urine to be tested side by side, comparing all three head to head objectively. Is our current gold standard truly the best modality to assess cellular health long term in chronic disease? One good example where this may be of particular use is copper.

Copper toxicity: benefits, concerns and testing

From my perspective, both the benefits of copper and the drawbacks of excess copper in the modern world are heavily underrecognised. Many people are aware that one of the minerals in balance with copper is zinc, but few understand how important copper itself is, as well as the other minerals, vitamins and heavy metals it interacts with.^{79, 147–149} Copper may also be a good example of why several types of test may be the best way to assess cellular health long term in chronic disease.

The concern. To understand the importance of this, we should understand the association between high copper and depression and anxiety.^154–157 We should also understand what is well known in conventional medicine: that when a person is overloaded with copper, a number of issues can occur, affecting multiple organs and systems throughout the body.¹⁴⁸ I therefore do have a concern regarding copper levels rising in users of the combined pill, as oestrogen raises caeruloplasmin, the protein that carries copper in the blood.^{158, 159} So the open question is whether free copper rises too. Furthermore, another contraceptive offered to women is the copper coil, a device from which copper ions are released.¹⁶⁰ Whilst the studies that have attempted to measure copper have found contrasting results for a rise in blood copper, they appear to have measured total copper, not free copper. This questions the clinical significance of the studies done on this topic to date.^161–163

The testing. Therefore, if we are artificially raising copper in examples such as the above, is our current method of testing sufficient in a clinical setting to detect concerns such as this?^{94, 164} I think the example above may be a good reason for us, as doctors, to question our current ability to measure minerals such as copper, and whether there are better interpretive frameworks for the future. Could it be purely to measure copper in the blood, urine and hair and compare them? Or could it be to measure the other interacting minerals and vitamins as well, in all three modalities, such as zinc, iron, ferritin, vitamin A, vitamin D and so forth?^{148, 149} That may help us understand and build a better interpretive framework for concerns such as this in the future. Copper metabolism is important and complex enough that it deserves an article of its own, which I will write in the future.

Can a hair test show stress, thyroid, adrenal or hormone problems?

Hair cortisol, measured by a separate test, reflects the body’s stress hormone output over months.^{109, 111} To the best of my knowledge, the mineral ratios used to read the thyroid and adrenals have yet to be tested against a blood or hormone test.⁹⁷

Even so, I find the hypothesis-generating interpretive framework put forward by Dr Paul Eck and Dr George Watson quite interesting. As mentioned at the beginning of this article, it links a person’s health with their oxidation rate, stress pattern, thyroid function, sugar balance and nervous system.^{6, 9–12}

I find it interesting because of how hormones work at a cellular level. We need to consider their role in affecting mineral balance in the body, and how they can, in turn, be affected by the amount, or excess, of minerals and heavy metals in the body.^165–167

We know, for example, that aldosterone, one of the adrenal hormones, causes sodium to be retained and potassium to be lost through the urine.¹⁷ Thyroid hormones relate to calcium,¹⁶⁸ and sex hormones to copper and zinc.^{25, 158} Magnesium is needed to release parathyroid hormone, and selenium and iodine to make and activate thyroid hormone.^{23, 165, 166, 169} Magnesium is also needed for the pump that moves sodium and potassium across our cells, and low magnesium causes potassium to be lost.^{170, 171}

We also know that stress and low magnesium appear to feed each other,¹⁷² and high blood copper has been found in women with polycystic ovary syndrome.¹⁷³ In hair, high calcium has been found in people with an overactive thyroid, although this runs against what the hair model predicts,^{12, 121} and lower testosterone in men has been linked to higher hair copper relative to zinc.¹⁷⁴

And this is just a fraction of what I believe is the interconnected network of how minerals affect each other, and how they are connected to hormones. Current scientific literature has yet to study much of it, which may complicate the issue further.¹⁶⁷

So, taking all of this into account, what do I think is the way forward?

Is a hair mineral test worth it?

I believe a hair mineral test can be worth it, to help better understand a patient’s long-term health, taken in the context of their history in depth, whilst taking into account the complexity required to interpret it. And potentially alongside other tests and interpretive frameworks, such as conventional blood tests and functional medicine tests like the DUTCH, organic acids, gut health and food intolerance tests.

A hair test should never be read on its own. Just as any investigation in conventional medicine is one part of a patient’s history, a hair test is one part of a wider picture. That picture includes mind, body, spirit and energy, the patient’s environment, and what modern science, Ayurveda and Chinese medicine each tell us.

For the reasons given in this article, I think there is a genuine gap in testing in conventional medicine, and the hair test has the potential to fill it. I have personally read the interpretive framework of Dr Paul Eck and Dr George Watson, and of doctors who have followed it and believe in the hair test. I’ve understood the physiology and the scientific rationale on which they base it, to the best of my ability.^{6, 9–11} I believe it deserves serious consideration for the long-term health of patients, where we are no longer looking at a simplistic model of the human body. Instead, we are looking at how each mineral interacts with the others, with different hormones, with heavy metals, and with the various other factors described in this article, as well as those not described here, in context, with the nuance it deserves.

The true solution, from my perspective, therefore, has to be that healthcare professionals critically analyse the research and the biochemical rationale, and openly write our own thoughts in the most unbiased way.

That means professionals such as myself, ideally those with no affiliation or conflict of interest, and others throughout the world who are aware of industry-funded science, ghostwriting and marketing tactics.^175–177 I would extend this beyond healthcare professionals to lay members of the public, becoming more informed and questioning everything they have been told to believe is true. The same applies to every new piece of information, which may or may not be true. To me, this is the only solution going forward, as a new paradigm of healthcare inevitably emerges.

To me, the main criterion is to question everything we have been taught. For example, it is important for me to question Ayurveda and Chinese medicine just as much as conventional medicine. In this case, that includes the heavy metals that have sometimes been found in remedies that Ayurvedic and Chinese medicine practitioners offer.^{178, 179} In the same way, every healthcare professional may, depending on their background, interpret and understand things differently, but each of us should question our own background. Functional medicine doctors should do the same, and conventional medicine doctors should do the same, with one goal in mind: the patient, and the betterment of their health. That should be the primary motive.

What would change my mind? If a number of doctors, scientists, or even lay people came to a different conclusion, I would seriously consider it. By that I mean people who understand this topic, its nuance and its complexity very well, with no affiliation or conflict of interest with testing or pharmaceutical companies. If they were to write rebuttals to articles like this, or give a rationale I haven’t considered, showing there is no benefit to these tests, even alongside blood or urine tests, that would change my mind. Or if laboratories, analysing the same hair with the same methods, still couldn’t agree.

And that, to me, is the way forward: healthcare professionals like me writing openly, running n-of-1 studies, trials in a single patient, explaining their thinking and being open to discussion.¹⁸⁰ The n-of-1 trial is already ranked, alongside reviews of randomised trials, at the highest level of evidence for whether a treatment helps, because each patient serves as their own control.^{181, 182} That, to me, is the future of healthcare.

Where can you get a hair mineral test, and what does it cost?

In the UK, hair tests ordered directly cost about £74 to £99. In the US, many are ordered through a practitioner, and the laboratories often do not publish their prices. These are well-known providers in the US and UK, with prices as listed on 18 October 2026.