What Are the 72 Trace Minerals in the Human Body?

There is no established scientific list of 72 trace minerals required by the human body. The number comes from supplement marketing, not from nutrition science or biochemistry. Researchers have identified roughly 20 elements that appear essential for human health, about half of which are metals and half non-metals.¹ Beyond those, dozens of other elements do show up in human tissues, but “detectable in the body” and “needed by the body” are very different things. Understanding where the 72 number originated, what the actual essential minerals are, and why the distinction matters can save you from spending money on supplements that promise more than the science supports.

Where the “72 Trace Minerals” Claim Comes From

The figure traces back to companies selling products derived from ancient plant deposits, deep-sea water, or substances like shilajit, a tar-like resin found in mountain rock. When these materials are analyzed with modern instruments, researchers can detect a long list of chemical elements, sometimes 60, 70, or more, simply because the source material has been concentrating minerals from soil and water for millennia. Shilajit, for example, has been profiled using mass spectrometry, and studies have quantified 14 or more elements in single samples, including major minerals like potassium, sodium, calcium, and magnesium alongside trace elements like zinc, boron, silicon, strontium, and manganese.² Other analyses have found additional metals including iron, along with rare earth elements and even toxic metals like lead and cadmium, though typically below safety thresholds.³

Deep-sea water products follow a similar pattern. Water pumped from depths of 200 meters or more contains magnesium, calcium, potassium, chromium, selenium, zinc, vanadium, and other elements in various concentrations.⁴ Marketers take the total count of detectable elements in these products and present it as a health benefit. The logic goes: the human body contains trace amounts of many elements, this product contains many elements, therefore this product gives your body what it needs. The problem is that most of those elements have no known biological role, and some are actively harmful.

What Science Actually Classifies as Essential

Nutrition scientists divide the minerals your body needs into two tiers based on how much you require daily. Macrominerals, like calcium, magnesium, potassium, sodium, and phosphorus, are needed in relatively large amounts. Trace minerals are needed in tiny quantities, often measured in micrograms. The classic list of essential trace minerals includes iron, zinc, copper, manganese, iodine, chromium, selenium, molybdenum, and cobalt.⁵ These nine serve as parts of enzymes, hormones, and structural proteins across every major metabolic pathway in the body. When any of them is seriously deficient, the consequences tend to be widespread and hard to pin down to one symptom, because they operate at such a fundamental level.

Adding the macrominerals and the non-metal essential elements like sulfur and chloride brings the total to roughly 20 elements currently considered essential for human biological function.¹ That number is well under 72, even with generous counting. The gap between 20 and 72 is filled with elements whose roles in human health are either unproven, speculative, or nonexistent.

The “Ultratrace” Category and Why It Stays Murky

Below the established essential trace minerals sits a second tier of elements sometimes called ultratrace elements. These include boron, silicon, vanadium, nickel, and arsenic. Animal studies have shown biological effects when these elements are severely restricted in the diet, which led some researchers in the 1980s and 1990s to label them “essential.” But decades later, specific biochemical functions for most of them in humans still have not been nailed down.⁶

Boron is the strongest candidate in this group. Research links it to bone maintenance, wound healing, hormone metabolism involving estrogen, testosterone, and vitamin D, and even cognitive performance in older adults.⁷ Silicon appears involved in cartilage and connective tissue, and vanadium interacts with certain enzymes in interesting ways.⁶ But “interesting” is not the same as “essential.” No official dietary requirement has been set for any of these elements in humans. When supplement labels list them, they are borrowing from preliminary science and presenting it as settled fact.

Even if you generously add every ultratrace candidate to the essential list, you still end up with roughly 25 to 30 elements. To get to 72, you have to start counting elements that are simply present in the body because we eat food grown in soil and drink water that has dissolved minerals in it. Strontium, barium, tin, lithium, rubidium, titanium, and many others can be detected in human blood and tissues. Their presence does not mean your body put them there on purpose.

Elements That Are Present but Not Welcome

Some of the elements included in “72 trace minerals” lists are recognized toxins. Lead, cadmium, mercury, and arsenic are among the most studied, and the evidence is clear: they accumulate in tissues and cause damage through oxidative stress, enzyme disruption, and interference with DNA repair.⁸ Even at low doses, these metals can affect the brain, kidneys, and heart.⁹ Research on placental tissue has specifically flagged arsenic, lead, cadmium, and mercury as the heavy metals most harmful to placental health, even at environmental-level exposures.¹⁰

The line between “essential” and “toxic” is not always intuitive. Chromium, for instance, sits on the essential list in its trivalent form, but hexavalent chromium is a carcinogen. Arsenic shows up in ultratrace discussions, yet inorganic arsenic is a well-documented poison. As one review noted, for the known essential elements, essentiality and toxicity are unrelated, because toxicity is fundamentally a matter of dose and chemical form.¹¹ A supplement containing “72 trace minerals” necessarily includes some that serve no purpose and some that could cause harm in the wrong amount or form.

Rare Earth Elements in the Body

One group of elements that often pads out the “72” count is the rare earth elements, a set of 17 metallic elements including cerium, lanthanum, neodymium, and others. These do accumulate in human bone over a lifetime. A study measuring rib bone from 80 adults found detectable levels of at least 14 rare earth elements and showed that their concentrations increase by one to two orders of magnitude over a lifespan, even in people living in non-industrial areas.¹² No known biological function has been identified for any of them. Research suggests that rare earth elements enter the body through food, water, and air, and can cause organ dysfunction and genetic disruption when exposure is elevated.¹³

Counting these elements as “trace minerals in the human body” is technically accurate. Counting them as minerals you need is not.

How Your Body Manages What Gets In

Your intestines are not a passive sieve. The absorption of essential trace minerals involves active transport systems, carrier proteins, and regulatory mechanisms that adjust how much of each element enters the bloodstream based on current needs. These transporters can be saturated and are influenced by genetics, nutritional status, and what else you ate at the same meal.¹⁴ The proteins that shuttle minerals across cell membranes are constantly being modified to maintain the right balance.¹⁵

This means your body is not simply tallying up every element you swallow and putting it to work. It is selectively absorbing the ones it recognizes and needs, while either ignoring or failing to block elements it has no specific use for. Toxic metals like lead can slip through because they resemble essential minerals closely enough to hijack their transport channels. But the body is not requesting them.

Trace minerals also compete with each other for absorption. Zinc and copper are the most studied example: high zinc intake inhibits copper absorption in the intestine, which can lead to copper deficiency.¹⁶ More recent work shows that iron, zinc, copper, and manganese all compete for binding sites on the mucus lining of the gut, with zinc having the strongest affinity and manganese the weakest.¹⁷ Taking a multi-mineral supplement with dozens of elements could, in principle, throw off the ratios your body needs for proper absorption of the ones that actually matter.

When Trace Mineral Deficiency Is a Real Problem

None of this means trace minerals are unimportant. Deficiencies in iron, zinc, and iodine are genuine public health crises. Modeling across 185 countries estimated that roughly 68% of the global population does not consume adequate iodine, vitamin E, or calcium, and that more than half are deficient in iron, zinc, or folate. Among women of reproductive age, about two-thirds are deficient in one or more of iron, folate, or iodine.¹⁸ These deficiencies have measurable consequences: impaired cognitive development in children, pregnancy complications, weakened immunity.

Iodine is a particularly interesting case because it is one of the halogen elements. It is essential for thyroid hormone production, and both too little and too much can cause problems. Research in Chinese schoolchildren found that excess iodine and fluorine in drinking water were associated with increased thyroid volume and lower IQ scores, with the two elements showing a synergistic harmful effect.¹⁹ The point is that trace minerals are not a case of “more is better.” Each one has a window, and the window is often narrower than people expect.

The deficiencies that affect billions of people worldwide involve a handful of well-characterized minerals, not 72 obscure ones. And they are typically addressed through diet, fortification, or targeted supplementation with specific elements at established doses, not through unregulated multi-mineral concoctions.

Why Food Composition Is Not Fixed

One argument that “72 trace mineral” supplement sellers lean on is soil depletion: the idea that modern farming has drained soils of minerals, so our food no longer provides what we need. There is a kernel of truth buried in this claim. Research in Sweden found a general correlation between trace element concentrations in soil and in cereal grains, meaning that what is in the soil does influence what ends up in your food.²⁰ And in areas near mining operations, soils can become contaminated with toxic trace elements at levels many times above safety standards, which then concentrate in crops like lettuce and chives.²¹

But soil depletion is not a blanket phenomenon. It varies by region, crop, farming practice, and specific mineral. And even where certain soil minerals have declined, the solution nutritionists recommend is eating a varied diet that draws from different food sources and regions, or supplementing with specific elements known to be deficient in your diet or blood. It is not taking a supplement with 72 elements and hoping the scatter-shot approach hits the ones you need.

What Blocks Absorption from Food

Even when your food contains adequate trace minerals, your body may not absorb all of them. Phytic acid, found in grains, legumes, nuts, and seeds, binds to minerals in the gut and reduces how much gets through. The effect varies by mineral source. One study found that zinc bound to a protein (zinc proteinate) was about 42% bioaccessible without phytic acid present, while inorganic zinc sulfate was only about 24% bioaccessible. Phytic acid worsened absorption for inorganic zinc at lower concentrations than it did for the protein-bound form.²² This is relevant because many multi-mineral supplements use inorganic forms that are cheaper but more susceptible to these dietary blockers.

Common food preparation methods like soaking, sprouting, and fermenting reduce phytic acid content and improve mineral availability. If you eat a varied diet and use these traditional techniques, the impact of phytic acid on your mineral status is modest. If you rely heavily on unprocessed whole grains and legumes without these preparations, and you also have borderline mineral status, phytic acid could tip you into deficiency for iron or zinc specifically.

Genetic Conditions That Disrupt Mineral Balance

For a small number of people, trace mineral problems are not about diet at all. Hereditary hemochromatosis causes the body to absorb and store too much iron, while Wilson’s disease does the same with copper. Both are inherited conditions that lead to metal accumulation in the liver and other organs.²³ In rare cases, both conditions can even coexist in the same person.²⁴ For anyone with these conditions, a multi-mineral supplement containing iron or copper could accelerate organ damage. This is one of several reasons that blanket mineral supplementation without knowing your actual levels is risky.

Hair Mineral Analysis and Other Commercial Tests

If you have looked into trace mineral supplements, you have probably encountered companies offering hair mineral analysis as a way to identify your deficiencies. The idea sounds reasonable: test what is in your hair and see what your body is missing. The science, however, does not support it. A study comparing mineral levels in blood and hair from healthy adults found no significant agreement between the two for any mineral tested. Most minerals showed no meaningful correlation between hair and blood concentrations at all.²⁵ Phosphorus showed a weak inverse relationship, meaning higher blood levels were associated with lower hair levels, which is the opposite of what the test would need to be useful.

Blood serum analysis is a more reliable way to assess trace mineral status, and modern methods can measure multiple elements from as little as 50 to 100 microliters of blood.²⁶ Even then, serum levels do not always reflect total body stores for every mineral. Iron status, for instance, is better assessed through ferritin and transferrin saturation than through serum iron alone. If you suspect a deficiency, a targeted blood test ordered by a doctor and interpreted in clinical context is far more useful than a hair analysis that checks for 72 elements at once.

What a Useful Mineral Supplement Actually Looks Like

For most people eating a reasonably varied diet, blanket trace mineral supplementation is unnecessary. When supplementation is warranted, it tends to involve one or two specific elements: iron for someone with confirmed deficiency, zinc during a period of increased need, iodine in a region with low soil iodine, selenium where soil is selenium-poor. The doses are specific, the forms are chosen for absorption, and the duration is defined.

A supplement labeled “72 trace minerals” is almost certainly including elements that have no known benefit, elements that compete with each other for absorption, and possibly elements that are mildly toxic. The fulvic acid or deep-sea water matrix these products often use may contain genuinely interesting compounds, but the trace mineral count is a marketing number designed to sound impressive, not a scientifically meaningful description of what your body requires. The human body is remarkably good at extracting what it needs from ordinary food and ignoring or excreting what it does not. For the handful of minerals where modern diets genuinely fall short, targeted and informed supplementation beats a scattershot approach every time.