Is There Gold in Our Body and How Much Is There?

The human body does contain gold, though the amount is vanishingly small. An average adult weighing about 70 kilograms carries roughly 0.2 milligrams of the element, spread across the blood, tissues, and organs. That is far too little to see, feel, or have any known biological purpose, but it is real and measurable with modern analytical chemistry. How it gets there, what it does (or doesn’t do) once inside you, and what happens when the amount increases through medicine, diet, or occupation are all more interesting questions than the simple yes-or-no.

How Much Gold and Where Does It Sit?

That 0.2 milligrams works out to about seven-billionths of your total body weight. If you could somehow extract it and press it into a single piece, you’d have a speck invisible to the naked eye. At today’s gold prices, it would be worth a fraction of a cent. For context, your body holds thousands of times more iron and zinc by weight.

Gold does not concentrate in one organ the way iron pools in red blood cells or calcium lodges in bone. Instead, it distributes widely at trace levels. Studies of laboratory animals injected with gold nanoparticles show that the liver and spleen take up the largest share, with the liver retaining up to about 40 percent of an injected dose within 24 hours, and the spleen around 2 percent. Gold was also detected in blood at that time point, while the heart, kidneys, and brain contained amounts too small to confirm by microscopy for the smallest particle sizes tested.¹ Those animal studies used deliberate injections of gold far exceeding normal human exposure, so the distribution pattern in a healthy person never exposed to medical gold would be much more diffuse and far lower in absolute quantity. Still, the liver-and-spleen preference tracks with how the body handles many foreign metals: specialized immune cells in those organs are designed to scavenge and sequester particles from the bloodstream.

How Gold Gets into Your Body

You don’t need to swallow a gold coin to pick up trace amounts. Gold enters the body through several mundane routes, most of which you’d never notice.

Food is one pathway. Gold appears naturally at ultra-low concentrations in some plant and animal foods because it exists in soil and water at parts-per-trillion levels. More directly, edible gold leaf and gold dust are used as a food decoration, classified in the European Union as the additive E175. A mouse study using food-grade gold at a dose scaled to what a human might realistically consume found gold particles in the lining of the small intestine, inside the cells of the gut wall, and even within immune cells of the gut’s lymphoid tissue.² That study also showed the gold affected gut bacteria and local immune responses differently in male and female mice, hinting that even “inert” metallic gold isn’t completely without biological effect when ingested regularly.

Dental work is another route. Gold alloys have been used for crowns, inlays, and bridges for well over a century because gold resists corrosion better than most metals. But “resists” is not the same as “immune to.” In the warm, acidic, enzyme-rich environment of the mouth, gold alloys slowly release small amounts of gold and other alloyed elements into saliva.³ Measurable amounts of gold, palladium, silver, zinc, and copper have been detected in the saliva of patients with gold crowns.⁴ The quantities are tiny, but over decades of wearing a gold crown, they add up as a chronic low-level source.

Occupational and environmental exposure rounds out the picture. Gold miners and refinery workers inhale dust and handle chemicals used to extract gold from ore. The direct risk from gold itself in those settings is often dwarfed by the hazards of mercury and arsenic, which are used in processing and are far more toxic.⁵ Jewelers and goldsmiths also receive chronic skin contact with gold, which, as we’ll see, is enough for the metal to slowly enter the body through the skin.

Gold as Medicine

The largest intentional doses of gold people have ever received come from medicine, not food. Gold compounds have been used to treat rheumatoid arthritis since the 1920s in a practice called chrysotherapy. Patients received injections of gold salts, sometimes weekly for months or years, to reduce joint inflammation. The approach fell out of favor as newer drugs arrived, but it persisted through the late twentieth century, and the accumulated clinical experience with it spans roughly seven decades.⁶

Chrysotherapy is the reason we know so much about how the body handles gold. In patients undergoing long-term treatment, researchers found significant quantities of gold in red blood cells, whole blood, and plasma.⁷ Gold also turned up in skin, hair, and nails, which makes sense given that those tissues receive a continuous blood supply and grow slowly enough for metals to accumulate. Modern interest in gold-based therapies has shifted toward gold nanoparticles for cancer treatment, drug delivery, and imaging. The basic pharmacology lessons from decades of chrysotherapy remain the foundation for understanding how these newer gold-based technologies behave inside the body.

How Gold Interacts with Your Proteins

One reason gold accumulates in tissue rather than washing straight through is that it binds to proteins in the blood and cells. Human serum albumin, the most abundant protein in blood plasma, is a well-studied example. When gold nanoparticles interact with albumin, they don’t just sit passively on the surface. Research using molecular simulations found that a gold nanoparticle caused more than half of the protein’s amino acid residues to become significantly less flexible, and about 10 percent of its residues changed their structural shape. These changes weren’t limited to the spot where gold touched the protein; they rippled across distant regions, potentially affecting albumin’s ability to carry fatty acids, thyroid hormone, and other metals.⁸

This kind of distant structural shift is called an allosteric effect, and it matters because albumin is the body’s main transport protein. If gold alters what albumin can carry, it might subtly influence how other molecules circulate in the blood. Whether this has any meaningful consequence at the trace levels of gold in a healthy person is unclear. At the much higher concentrations seen in chrysotherapy patients, though, the protein-binding behavior is clinically relevant because it determines how long gold stays in the body and where it ends up.

How the Body Gets Rid of Gold

Gold doesn’t stay in the body forever, but it leaves slowly. A comparative study of eighteen metals in rats found that between 20 and 50 percent of an administered gold dose was excreted within four days, with urine as the main route rather than feces.⁹ That puts gold roughly in the middle of the pack compared to other metals: faster to clear than arsenic or cadmium, slower than cobalt or silver.

The fact that a substantial fraction remains after four days helps explain why gold accumulates during long-term chrysotherapy. If patients receive weekly injections but clear only a fraction of each dose before the next one arrives, tissue levels climb steadily. After treatment stops, gold can still be detected in the body for months or even years, stored in the liver, spleen, kidneys, and skin. For someone who has never received medical gold, the trace amount present from diet and environment is so small that the body’s baseline excretory capacity handles it without difficulty.

When Gold in the Body Causes Problems

At trace levels, gold appears to be harmless. It is not mutagenic or carcinogenic in its non-radioactive forms, based on decades of occupational and medical observation.¹⁰ But at higher levels, particularly from chrysotherapy, gold can cause a range of side effects.

The most visually striking is chrysiasis, a permanent blue-gray or purple discoloration of the skin. It develops when gold deposits in the skin are activated by ultraviolet light, somewhat analogous to how silver causes argyria. Chrysiasis is rare and generally requires substantial cumulative gold exposure, but once present it does not reverse.¹¹

Gold allergy is more common than most people realize. Metallic gold in prolonged contact with skin is slowly ionized, allowing gold ions to be absorbed and to trigger an immune reaction.¹² Patch testing studies have found that gold sodium thiosulfate is one of the more frequent positive allergens in dermatology clinics. People who develop contact dermatitis from gold jewelry are reacting to these ions, not to the solid metal itself. Interestingly, the clinical significance of a positive gold patch test is debated, because some people test positive but never develop symptoms from wearing gold, while others have flares that correlate clearly with jewelry contact. Gold allergy has actually become a useful model system for studying how the immune system responds to metals in general.

In the dental context, researchers have also warned against assuming gold alloys are completely inert. Lab tests show that elements released from gold dental alloys can be cytotoxic to cells in culture.¹³ Whether that cell-culture toxicity translates to clinical harm in patients with gold crowns is less clear, since the concentrations released in the mouth are very low. But it’s a useful reminder that “gold standard” in dentistry is an older assumption that the evidence doesn’t fully support.

Why Gold Has No Known Biological Role

Despite being present in the body, gold is not known to serve any essential function. Your cells don’t need it the way they need iron for oxygen transport, zinc for enzyme activity, or copper for energy metabolism. No enzyme in the human body uses gold as a cofactor, and no deficiency syndrome results from having less gold than average.

This puts gold in a large category of elements that are detectable in the body simply because they exist in the environment and the body isn’t perfectly sealed. You also carry trace amounts of elements like rubidium, strontium, and even uranium for the same reason. The body’s barriers, including the gut lining, the skin, and the kidneys, are good at keeping most foreign material out or clearing it once it enters, but they’re not absolute. Small quantities of almost every naturally occurring element slip through, especially metals that share transport pathways with essential nutrients.

Gold is chemically quite stable, which is part of why it doesn’t participate in biochemistry. Biological enzymes typically exploit the ability of metals like iron, copper, and manganese to shift between different oxidation states, gaining and losing electrons during chemical reactions. Gold can do this in principle, but it is far less reactive under physiological conditions than those workhouse metals. Evolution apparently never found a use for it, so it remains a passive passenger.

Gold Nanoparticles and the Future of Gold in Medicine

While the gold already in your body is doing nothing useful, scientists are actively trying to put gold to work through engineered nanoparticles. Gold nanoparticles have properties that make them attractive for medical applications: they can be made in precise sizes, they absorb light at specific wavelengths depending on their dimensions, and their surfaces can be coated with molecules that target particular cell types.

Cancer treatment is a major area of interest. In photothermal therapy, gold nanoparticles are directed to a tumor and then illuminated with near-infrared laser light. The particles convert the light to heat, destroying the tumor cells around them while sparing more distant tissue. Drug delivery is another application: gold nanoparticles can carry chemotherapy drugs directly to cancer cells, potentially reducing the side effects of systemic treatment.

The body’s handling of these engineered particles follows the general pattern established by decades of chrysotherapy research and animal studies. Injected gold nanoparticles are captured primarily by the liver and spleen, where immune cells engulf them.¹ Particle size matters: smaller nanoparticles distribute more widely across organs, while larger ones are trapped more efficiently by those immune cells. Getting nanoparticles to accumulate at a tumor rather than being swept up by the liver remains one of the field’s biggest engineering challenges.

The interaction between gold nanoparticles and blood proteins like albumin also influences how the particles behave in the body. As soon as nanoparticles enter the bloodstream, they become coated with a layer of proteins, sometimes called a “corona,” that changes how cells recognize and handle them. The structural changes that gold nanoparticles cause in albumin, including reduced flexibility and altered binding capacity, mean the corona isn’t just a passive coating; it actively reshapes the protein environment around the particle.⁸ Researchers are working on engineering nanoparticle surfaces that control this corona formation, aiming to make particles that evade immune clearance and reach their intended targets more reliably.

Gold from Your Food Decorator

Gold leaf on desserts, cocktails with gold flakes, and gold-dusted chocolates have become increasingly common in high-end food presentation. From a regulatory perspective, food-grade gold (E175 in the EU) is generally considered safe because metallic gold passes through the digestive tract largely intact. The logic is simple: if the body can’t dissolve it, it can’t absorb it in meaningful quantities.

But the mouse study mentioned earlier complicates that tidy picture. When mice consumed food-grade gold daily for 90 days at doses equivalent to realistic human intake, gold particles were found not just passing through the gut but inside the cells lining the intestine and within immune cells beneath the gut surface.² The study also found sex-dependent changes in gut microbiota composition and local immune responses. None of this proves that gold-decorated food is dangerous to humans, and a single mouse study can’t be directly extrapolated to people. But it does suggest that the assumption of complete inertness deserves more scrutiny, particularly for people who consume decorative gold regularly rather than as an occasional novelty.

The particle size of food-grade gold matters. Thin gold leaf consists of relatively large, flat pieces that are less likely to cross biological barriers. Some commercial food-gold products, however, contain much finer particles, approaching the nanoscale. Smaller particles have greater surface area relative to their volume, making them more chemically reactive and more likely to be taken up by cells. This is the same size-dependent behavior seen in the animal injection studies, where 10-nanometer gold particles spread to more organs than 250-nanometer particles did. If the food industry trends toward finer gold particles for aesthetic reasons, the gap between what’s been tested for safety and what’s actually on the plate could widen.

Occupational Gold Exposure and Confounding Hazards

For most people, the question of gold in the body is academic. For gold miners, refiners, and jewelers, it’s occupational. Workers in artisanal and small-scale gold mining face the highest exposures, but the health effects are notoriously difficult to attribute to gold itself. Mercury amalgamation is still used in many small-scale operations to extract gold from ore, and arsenic is a common contaminant in gold-bearing rock. Both are well-established toxins, and their effects overlap with and overshadow any potential harm from gold exposure alone.⁵

This confounding is a genuine obstacle for researchers trying to establish gold’s own toxicity profile. When miners develop kidney damage, neurological symptoms, or respiratory disease, the culprit is almost certainly mercury or silica dust rather than gold. Gold itself, in its metallic form, is one of the least reactive metals, which is the same property that makes it useful in jewelry and electronics. The practical upshot for workers is that the gold isn’t the thing to worry about, but the chemicals used to get it out of the ground very much are.

Even in high-tech settings, gold exposure is usually a minor concern compared to the solvents, acids, and other metals involved. Electronics recyclers who process gold-containing circuit boards, for example, face risks primarily from lead, cadmium, and the acids used in leaching processes, not from the gold they’re recovering. The irony is that gold’s famous stability, the very property that makes it valuable, also makes it one of the least hazardous metals to work with. The danger is in what accompanies it.