The earthing evidence mostly comes from people tied to the products

The product looks like ordinary bedding. It is a fitted sheet or a mat woven with conductive fibers, with a cord that runs to the ground terminal of a wall outlet or to a metal rod pushed into the soil outside a window. The promise is that lying on it lets electrons from the Earth flow into your body overnight and calm inflammation.

That promise rests on a small research literature, and most of it comes from researchers with disclosed ties to the company that sponsored it. The papers say so themselves, in their disclosure statements. That group’s sham-controlled trial of sore muscles found no difference in pain, and the one outside test of a grounding product, a running shoe, found no effect on anything it measured. The clearest documented hazard is electrical: in 2025, British product-safety officials stopped an earthing sheet at the border because the plug adaptor supplied with it carried a high risk of electric shock.

This article examines the products and the electrical claim behind them. Whether time spent outdoors, barefoot or not, does you good is a separate matter, explored in this site’s coverage of nature and health.

The claim, in its proponents’ words

The fullest statement of the idea is a 2012 review in the Journal of Environmental and Public Health by Gaétan Chevalier, Stephen Sinatra, James Oschman, Karol Sokal and Paweł Sokal. It describes the Earth’s surface as holding “a limitless and continuously renewed supply of free or mobile electrons,” kept topped up by the planet’s atmospheric electrical circuit. Modern life, in this account, cuts people off from that supply through rubber-soled shoes and sleeping off the ground.

The proposed mechanism follows. Electrons entering the body through skin contact would neutralize reactive oxygen species, the unstable molecules often called free radicals, and so reduce acute and chronic inflammation. The review itself describes that step as an assumption.

The idea has had one recent laboratory test. In a 2025 study in FEBS Open Bio, Cecilia Giulivi of the University of California, Davis and a co-author measured isolated mitochondria, the energy-producing parts of cells, under wired, sham and untouched conditions. The grounded samples made 5 to 11 percent more of the cell’s energy molecule, ATP, and 22 to 33 percent fewer reactive oxygen species. That is a measured effect in a lab dish. It does not show that sleeping on a grounded sheet changes inflammation in a person, which is the claim being sold.

The review also tells the origin story. Clinton Ober, described as a retired cable television executive, noticed that grounding a TV cable to the Earth removes interference from its signal and wondered whether the human body worked the same way. In Poland, Karol and Paweł Sokal, a cardiologist and a neurosurgeon who are father and son, ran parallel experiments with copper plates strapped to the leg and wired to the ground outside.

Commercial versions now include sheets, mats, adhesive patches and bands. According to a 2015 review by Oschman, Chevalier and Richard Brown, they connect by cord either to a grounded wall outlet or to a rod placed in the soil. In the equipment used for one 2015 trial, a 100,000-ohm resistor was molded into each cord for surge protection, a part that limits how much current can pass through the line.

One part of the physics is not in dispute. A grounded body does settle to the Earth’s electrical potential. A study summarized in the 2012 review, run by an electrical engineer who was both its author and its subject, found that grounding cut the 60-hertz voltage that household wiring induces on the body about 70-fold. That is a measured electrical change. Whether it changes anyone’s health is a separate question, and the rest of this article is about that one.

Who produced the evidence

The core research comes from a small, connected group, and its own papers document the connections.

The 2015 review in the Journal of Inflammation Research discloses that Chevalier and Oschman were independent contractors for an earthing-products company, described as the company sponsoring earthing research. Both also owned a small percentage of its shares. Brown, the third author, was also a contractor for the company. The acknowledgments thank Clinton Ober, of the same company, for continuous support.

A 2015 trial in the Open Access Journal of Sports Medicine, by Richard Brown, Gaétan Chevalier and Michael Hill, states that the company provided financial support and that a grounding-products seller supplied the equipment. Brown was a contractor hired by the company for the project, and Chevalier had been a contractor for it since 2007.

The pattern continued in a 2023 special section on earthing in the Biomedical Journal. One review in it lists an author’s affiliation as a company that sells grounding mats and sheets. Another, by Oschman, lists among his affiliations an institute in Palm Springs, California, the city the 2015 trial gives as its sponsor’s home. The issue’s editorial, which introduced the section, was written by a freelance journalist.

Supporters do not describe a large literature either. A 2019 review in the journal Explore, written by six integrative and naturopathic clinicians who urged that earthing be added to clinical practice, counted some 20 studies to date.

Disclosure is to these authors’ credit. The problem is what disclosure reveals about replication. This library found no independent systematic review or meta-analysis of earthing in the medical literature, and only one trial of a grounding product from researchers outside the network.

There is a useful outside yardstick. The Federal Trade Commission’s December 2022 guidance on health advertising says health claims generally need randomized, controlled human trials, with both participants and researchers blinded, ideally against a placebo or sham. It also notes that independent experts can provide unbiased assessments of a study’s validity. That is the standard the evidence below can be measured against.

Grounding should be unusually easy to hold to that standard. Unlike massage or exercise, it can be faked convincingly: a sham sheet or patch is built to look identical, with the connection to the Earth simply broken, and the published trials describe exactly that setup. A practice this easy to blind could have been tested at scale years ago. The largest sham-controlled trial this library found enrolled 84 people, and, as described below, its report contradicts itself.

How small the studies were

Most of the research that the 2012 review relied on was small, and much of it had no comparison group.

• A 2004 sleep and cortisol pilot grounded 12 people with sleep problems, pain and stress in their own beds for eight weeks. It had no control group. Participants reported better sleep, and their saliva cortisol profiles showed what the authors called a trend toward normalization.
• A 2010 muscle-soreness pilot put eight healthy men through calf exercises, grounding four and sham-grounding four. Rather than testing a hypothesis statistically, the authors flagged any of 48 measures that differed by 10 percent or more as worth further study.
• A blood study published in 2013 grounded 10 healthy adults, recruited by word of mouth, for two hours. It measured the electrical charge on red blood cells and how much they clumped in fingertip blood on microscope slides. The abstract describes no comparison group. The title claims that grounding reduces blood viscosity, and the conclusion calls grounding potentially one of the most profound ways to reduce cardiovascular risk.
• Experiments by the Sokals, published in 2011, ranged from 12 to 84 participants and reported shifts in blood minerals, glucose and thyroid hormones after grounding.
• A 2015 mood pilot by Chevalier grounded or sham-grounded 40 adults for one hour in a recliner, double-blinded, and found that pleasant and positive mood scores improved only in the grounded group.
• A 2019 trial among 16 massage therapists, run at a California wellness center with Chevalier among the authors, found less pain and fatigue and better mood and physical function during the weeks they were grounded at work and in bed.

Those last two are small positive results, reported plainly here. Each comes from within the same research network, and neither has been repeated by an outside team.

The 2012 review treated the eight-man pilot as confirmation that grounding reduces pain, and described earthing as the first intervention known to speed recovery from delayed-onset muscle soreness, the ache that follows unaccustomed exercise. That claim got a proper test three years later.

The claims have also grown. The same 2023 journal issue carried an uncontrolled report from Iraq on 71 people with COVID-19 who grounded themselves for 15 minutes to six hours a day, which concluded that earthing had significant curative and preventive effects. Two patients died, which the author attributed to grounding that was too little and too late. With no comparison group, the report cannot separate grounding from the ordinary course of the illness.

In this library’s vocabulary, the claims about sleep, cortisol and blood viscosity sit at insufficient evidence to assess, and the reason is thin, weak evidence rather than a practice too vague to test. No trial large enough, controlled enough or independent enough to grade them has been published.

What the controlled trials found

Sore muscles, with the sponsor holding the key

The 2015 sports medicine trial was the follow-up to the eight-man pilot, built to test its claims with a sham. Thirty-two healthy men aged 18 to 24 did 200 half-knee bends to induce muscle soreness. They were then randomly assigned to be grounded or sham-grounded for four hours on each of the first two days. A sham setup looks the same but is not connected to the Earth.

Both groups reported pain on every day afterward, and the authors wrote that the study showed no difference in pain relief. Their headline finding was creatine kinase, an enzyme that leaks from damaged muscle. On day two it rose significantly in the sham group but not in the grounded group, and the difference between groups reached P=0.04. The methods say one-tailed tests, which look for change in only one expected direction, were used for this enzyme both within each group and between the groups on days two through four, because the authors expected the sham group’s markers to rise more. The authors also reported, to their credit, that several blood-cell results differed from the pilot’s, in some cases in the opposite direction, including neutrophils, white cells overall and eosinophils.

The paper’s abstract concludes that grounding reduced muscle damage. Its account of how the trial was run deserves to be read beside its disclosure.

The disclosure states that the company and the equipment seller played no role in the study design, data analysis or interpretation. The methods section states: “Only the sponsor knew which was functional and which was sham until after the study and statistical evaluations were completed.” Participants were paid $150 and kept the grounding equipment. Those are the paper’s own statements, set side by side.

For the specific claim that grounding eases muscle soreness, the best test from the proponents’ own group found nothing. One 32-person trial is too small to move the claim to tested and not supported, so it stays at insufficient evidence, with the strongest available result pointing against it.

After back surgery, a report that contradicts itself

A newer and larger trial shows why the full text of a paper matters. In 2025 Paweł Sokal, one of the original Polish researchers, and colleagues reported a randomized, sham-controlled study of 84 patients grounded, or sham-grounded, for one night after lower-back surgery. It reported less pain the next morning: a median drop of 2 points on a 10-point scale with grounding, against 1 point with the sham. The grounded group was also younger on average, 53 against 60.

The rest of the report is harder to rely on. The abstract says the drop in creatine kinase was significantly greater in the grounded group; the results section says the difference between groups was not significant. Its figures for the inflammation marker C-reactive protein also differ between abstract and results, with units that switch between milligrams per liter and per deciliter. Its pain result is a small positive finding from inside the network, published in a paper that contradicts itself on other measures.

Running shoes, tested from outside

A 2022 study in the International Journal of Environmental Research and Public Health, led by researchers at the University of Zaragoza in Spain, tested a running shoe with a conductive element under the insole. Ten elite runners ran 20 minutes on a dirt track at a fixed effort in both the grounding shoe and a standard training shoe, in random order, a week apart.

Running economy, the oxygen cost of running at a given pace, was 51.1 milliliters per kilogram per minute in the standard shoe and 50.9 in the grounding shoe. Heart rate, lactate and perceived fatigue showed no differences either. Several co-authors worked in a major sportswear company’s innovation division, so the study was not free of industry ties. It was, however, outside the earthing network, and it is the only trial of a grounding product by such a team that this library found.

Ten runners is a small sample, and the claim tested was narrow. For that one claim, the result is a clean null.

The electrical question is narrower than it sounds

Connecting a sleeping person to a building’s electrical earth sounds like it should worry regulators. The record is more specific.

On March 27, 2025, the United Kingdom’s Office for Product Safety and Standards published a report on a bed sheet sold with a cable and plug for earthing. It rated the risk of electric shock high and rejected the import at the border. The fault was not the earthing function. It was the travel adaptor plug supplied with the sheet, whose pins did not meet requirements because they sat too close to the plug’s edge, so a finger could touch a live pin while plugging it in. The product failed two sets of British electrical safety regulations, and the report made no finding about grounding as such.

That is the only grounding or earthing product report this library found in the UK government’s product safety database. It found no comparable recall or warning from a US regulator, and no regulator statement on the safety of grounding the body through household wiring.

A different federal policy shapes how these products are sold. Under FDA’s general wellness guidance, reissued in January 2026, low-risk products whose claims are limited to areas such as sleep or relaxation can fall outside the agency’s scrutiny. A claim to treat a specific disease puts a product outside that policy. A sheet sold for better sleep and a sheet sold to treat autoimmune disease face different rules, even if they are the same sheet.

Medication cautions from the proponents themselves

The most practical warnings in this field come from the people promoting it, and they rarely travel with the products.

The 2012 review states that combining earthing with the blood thinner warfarin could compound its blood-thinning effect and must be supervised by a physician. It reports multiple anecdotes of elevated INR, the blood test used to monitor warfarin. It also reports Ober and colleagues’ observation that many people taking thyroid medication described symptoms of an overactive thyroid, such as heart palpitations, after starting grounding. The Sokals’ experiments, as the review summarizes them, reported that a single night of grounding lowered one thyroid hormone and raised another, along with thyroid-stimulating hormone, in 12 adults without thyroid disease. They also reported lower fasting glucose after 72 hours of grounding in people with type 2 diabetes who were taking a glucose-lowering drug.

These are anecdotes and small measurements, not tested findings, and nothing in the controlled record confirms them. They are still the products’ advocates’ own cautions. If you take warfarin or thyroid hormone, a grounding product is worth mentioning to the clinician who adjusts your dose. Unusual bruising, bleeding gums, blood in urine or stool, or a racing heart are reasons to call that clinician promptly, whatever their cause. The same goes for anyone on diabetes medication who notices shaky, sweaty spells after starting any new routine.

The symptoms that draw people to these products deserve attention in their own right. Joint pain with swelling or redness, pain that wakes you at night, or poor sleep that has lasted for months has causes a clinician can look for. A grounding sheet will not tell you which one you have.

Five questions for any grounding study

1. Who paid, and who employs the authors? The disclosure section answers this, and in this field it usually names the same company.
2. Was there a sham, and who held the key? In the best trial here, the sponsor did.
3. How many people, and was there any comparison group? Several studies had none, and the muscle-soreness trial had 32.
4. Is the headline the main result? The 2015 trial’s abstract leads with an enzyme; its pain result was null.
5. Has anyone outside the group repeated it? The one outside trial found nothing.

The Takeaway

Being grounded is a real electrical state, and the products can deliver it. A health benefit from it has not been shown. The evidence that exists comes largely from researchers tied to the products, mostly in very small studies, and the two cleanest tests of specific claims, sore muscles after exercise and running efficiency, found no difference. The larger trial that reported less pain contradicts itself elsewhere in its own pages. The one regulator action on record concerned a faulty plug, not the idea of grounding.

Sources

1. Journal of Environmental and Public Health. “Chevalier G, Sinatra ST, Oschman JL, Sokal K, Sokal P. "Earthing: Health Implications of Reconnecting the Human Body to the Earth's Surface Electrons." Journal of Environmental and Public Health, 2012. PubMed. DOI: 10.1155/2012/291541.” pubmed.ncbi.nlm.nih.gov
2. Journal of Inflammation Research (Dove Medical Press). “Oschman JL, Chevalier G, Brown R. "The effects of grounding (earthing) on inflammation, the immune response, wound healing, and prevention and treatment of chronic inflammatory and autoimmune diseases." J Inflamm Res, 2015;8:83-96 (publisher full text with disclosure and acknowledgment). PubMed. DOI: 10.2147/JIR.S69656.” dovepress.com
3. Open Access Journal of Sports Medicine (Dove Medical Press). “Brown R, Chevalier G, Hill M. "Grounding after moderate eccentric contractions reduces muscle damage." Open Access J Sports Med, 2015;6:305-17 (publisher full text with methods, funding and disclosure). PubMed. DOI: 10.2147/OAJSM.S87970.” dovepress.com
4. Journal of Alternative and Complementary Medicine. “Brown D, Chevalier G, Hill M. "Pilot study on the effect of grounding on delayed-onset muscle soreness." Journal of Alternative and Complementary Medicine, 2010. PubMed. DOI: 10.1089/acm.2009.0399.” pubmed.ncbi.nlm.nih.gov
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11. International Journal of Environmental Research and Public Health. “Muniz-Pardos B, Zelenkova I, Gonzalez-Aguero A, et al. "The Impact of Grounding in Running Shoes on Indices of Performance in Elite Competitive Athletes." International Journal of Environmental Research and Public Health, 2022. PubMed. DOI: 10.3390/ijerph19031317.” pubmed.ncbi.nlm.nih.gov
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