What grounding sheets and mats claim
Of those two blinded trials, one did find a smaller rise in a muscle-damage marker, and the other found longer tracker-measured sleep212. A 2015 paper setting out the theory was written by contractors for a company that sponsors earthing research8.
New Zealand’s advertising watchdog and a German court have rejected sellers’ health claims6711. A UK regulator also rejected one plug-in earthing sheet at the border because its adaptor posed an electric-shock risk5.
Grounding sheets, mats and bed pads are made with conductive fabric, such as a cotton and silver blend56. A cable and plug connect them to a wall socket56. The plug carries no current6. One manufacturer says its products need an outlet with a working ground port, checked with an outlet checker before use10. A UK safety notice describes one such sheet as “said to provide electrons from the earth to the body”5.
The health claims go well beyond comfort. A German court examined claims of lower cortisol and stress, better blood flow in small capillaries and anti-inflammatory effects6. New Zealand’s advertising watchdog looked at claims of less inflammation, pain relief, better sleep and “faster healing by up to 80%”711.
What the earthing studies show
The sleep study cited most often is a 2004 pilot1. Its 12 participants had sleep problems, pain and stress, and slept on a grounded mattress pad for eight weeks1. Night-time salivary cortisol fell, and nearly all participants reported better sleep and less pain and stress1. But the abstract describes no control group and no blinding1. Without them, the changes can’t be separated from expectation, placebo or symptoms improving on their own.
The largest sleep trial we found is a 2025 Korean pilot with 60 participants, described in its title as double-blind12. They were randomly assigned to a grounding mat or a non-grounding mat and used it six hours a day for 31 days12. The abstract reports improved sleep quality, insomnia, sleepiness and stress questionnaire scores within the grounded group12. Compared with controls, the grounded group had longer total sleep time measured by actigraphy and, at a day-38 follow-up, lower insomnia scores (P < 0.05)12. The abstract gives no effect sizes12.
Two CQUniversity researchers writing in The Conversation noted that both groups improved on all measures13. By their reading, the groups didn’t differ in sleep quality, daytime sleepiness or stress13. The grounded group’s lower insomnia scores, they added, were already present at the start13. They called it unclear whether grounding had a tangible impact on sleep13.
The most rigorous test of recovery we found is a 2019 triple-blind randomized trial in 22 healthy sport-science and physiotherapy students2. Each did a single 20-minute downhill treadmill run2. During a 10-day recovery period, 12 slept on grounded sheets and 10 on sham-grounded sheets2. Jump height fell less in the grounded group (8.2% versus 14.3%)2. The muscle-damage marker creatine kinase also rose less (about 310% versus 760%)2.
But muscle soreness didn’t differ between groups, and neither did strength in the non-dominant leg2. The detailed blood analyses came from only four people2. The authors declared no commercial or financial conflicts2. A German therapy center supplied identical sheets for both groups2.
For pain, a 2019 student evidence review from a physician assistant program examined three studies3. Two were placebo-controlled trials, and the third was the 2004 pilot13. Two of the three reported less pain3. One of the placebo-controlled trials found no significant difference between grounded and placebo groups3. The reviewer concluded that grounding showed promise for pain, but that the samples were small and more data were needed3.
| Study | Who was studied | Design | What it found | Main limits |
|---|---|---|---|---|
| Ghaly and Teplitz, 20041 | 12 adults with sleep problems, pain and stress | 8-week before-and-after pilot; no control group described | Lower night-time cortisol; self-reported better sleep, less pain and stress | Tiny, uncontrolled, largely self-reported |
| Park et al., 202512 | 60 participants; characteristics not given in the abstract | Randomized pilot against a non-grounding mat, described as double-blind, 31 days | Longer actigraphy sleep time than control; within-group questionnaire gains; lower insomnia score than control at day 38 | No group difference in sleep quality, sleepiness or stress; insomnia gap present at baseline13 |
| Müller et al., 20192 | 22 healthy sport students after a downhill run | Triple-blind randomized trial against sham sheets, 10-day recovery period | Smaller drop in jump height; smaller creatine kinase rise | No difference in soreness; blood tests in 4 people; short |
| Umbro, 2019 review3 | 3 studies of pain | Student evidence review | 2 of 3 studies reported less pain | Small samples; one controlled trial found no difference |
What the studies don’t show
It doesn’t show lasting benefits in ordinary adults. The studies we could verify enrolled 12 to 60 people1212. They ran from 10 days to eight weeks1212. None measured illness, doctor visits or other hard health outcomes1212. Instead they tracked hormones, blood markers, jump tests, activity-tracker sleep estimates and symptom questionnaires1212.
It doesn’t consistently show that people feel better once placebo is controlled for. In the recovery trial, soreness was the same with real and sham grounding2. In the sleep trial, an independent reading found no difference between real and sham groups in sleep quality, daytime sleepiness or stress13. Of the two placebo-controlled pain trials in the student review, one reported less pain and one found no difference3. The striking improvements in the 2004 pilot came without any comparison group1.
It doesn’t amount to the kind of evidence US regulators expect behind health claims. The FTC says health claims generally need randomized, controlled human clinical testing4. It adds that numerous flawed and inadequate studies are unlikely to add up to competent and reliable scientific evidence4. A few small randomized trials of grounding exist212. But we didn’t find a large randomized trial, or an independent systematic review or meta-analysis, showing a meaningful health benefit.
A German court reached a similar view about claimed effects on cortisol, stress, blood flow and inflammation6. According to the consumer group that brought the case, the court found the studies a company submitted unsuitable to prove them6.
Industry ties and an untested mechanism
A 2015 paper that sets out the theory behind grounding was written by authors with financial ties to the business8. Two of them disclosed working as independent contractors for EarthFx Inc. and owning a small percentage of shares in it8. The paper describes EarthFx as the company sponsoring earthing research8. The third author disclosed contracting for the same company8.
The paper is labeled a hypothesis article, not a trial or a systematic review8. Its authors acknowledge that most of the pilot studies behind it involved relatively few subjects8. The muscle-soreness experiment it describes had eight people, four grounded and four controls8. It also says the inflammation research community has the means to verify, refute or clarify the authors’ interpretations8.
The proposed mechanism is that free electrons from the earth’s surface spread into the body8. There, the theory goes, they act as antioxidants that limit tissue damage from reactive oxygen species8. Its own proponents present this as a hypothesis8. We found no controlled human study that measured such an electron flow and tied it to a health outcome.
Independent work is thin. The 2019 recovery trial declared no commercial conflicts2. But the 2025 sleep trial’s abstract doesn’t say who funded it or supplied the mats12.
Are grounding sheets safe? The plug matters more than the sheet
The sheet itself is cloth, and the documented hazard is the plug or adaptor that connects it to the wall. In March 2025 the UK Office for Product Safety and Standards rated an earthing bed sheet sold via Amazon as high risk5. Its travel adaptor’s pins sat too close to the plug’s edge, so a user could get an electric shock plugging or unplugging it5. The product failed the UK Electrical Equipment (Safety) Regulations 2016 and the Plugs and Sockets etc. (Safety) Regulations 19945. The import was rejected at the border5.
One manufacturer acknowledges that the wiring matters. The company behind the Earthing brand says its products have a built-in resistor that limits the flow of current9. It warns that a homemade wire in an outlet’s ground port has no resistor to protect the user and “has the potential to be unsafe”9.
The same company says a home may be wired incorrectly10. It says outlets must be checked with an outlet checker before use, and that an electrician is needed if the check fails10. Outlets in homes built before the 1960s may have no ground port at all10.
- An earthing sheet sold online has already been found with a plug that failed UK electrical safety rules5
- One manufacturer says its cords include a current-limiting resistor9
- The same manufacturer says outlets should be checked for correct grounding before use10
- A homemade wire in an outlet’s ground port has no such resistor, and the same manufacturer calls the practice potentially unsafe9
Regulators and courts
Germany: the consumer group Verbraucherzentrale NRW took Samina Deutschland to court over a YouTube video about its grounding bed pad6. The video claimed the pad lowered cortisol and stress, improved capillary blood flow and reduced inflammation6. The Kempten Regional Court (case 1 HK O 149/22) ordered the company to stop the advertising6. According to the consumer group, the court found the studies the company submitted unsuitable to prove the claimed health effects6. The group announced the ruling on May 2, 2023, and said it was not yet final6.
New Zealand: in a decision published in October 2025, the Advertising Standards Authority upheld a complaint against a Facebook ad for grounding sheets7. The ad claimed lower inflammation, pain relief, better sleep and up to 80% faster healing7. The complaints board found it misleading, with unsubstantiated therapeutic claims aimed at vulnerable audiences7. It ruled the ad should be removed, and the advertiser didn’t respond7.
In a decision published in December 2025, the board upheld a second complaint, this time against the same seller’s website11. The site said earthing works by letting electrons flow from the Earth into the body and “has been shown to” reduce inflammation and improve sleep11. The board found the therapeutic and sale claims unsubstantiated11. Again, the advertiser gave no response11.
United Kingdom: the product-safety action described above was about electrical safety, not health claims5.
United States: we didn’t find an FDA, FTC or Consumer Product Safety Commission action aimed specifically at grounding products. The FTC’s general rule still applies: health claims need competent and reliable scientific evidence, usually randomized, controlled human clinical testing4.
Sources
- The biologic effects of grounding the human body during sleep as measured by cortisol levels and subjective reporting of sleep, pain, and stress Journal of Alternative and Complementary Medicine, 2004
- Effectiveness of grounded sleeping on recovery after intensive eccentric muscle loading Frontiers in Physiology, 2019 · randomized trial
- Does grounding to the earth reduce subjective experience of pain? Philadelphia College of Osteopathic Medicine, 2019
- Health Products Compliance Guidance Federal Trade Commission, 2022 · regulator
- Product Safety Report: ConBlorr Earthing Bed Sheet sold via Amazon (2503-0109) Office for Product Safety and Standards (GOV.UK), 2025 · regulator
- Erfolg vor Gericht: Gesundheitsversprechen für Bettauflage unzulässig Verbraucherzentrale NRW, 2023
- Complaint 25/169: Premium Grounding (Facebook) Advertising Standards Authority (New Zealand), 2025 · regulator
- The effects of grounding (earthing) on inflammation, the immune response, wound healing, and prevention and treatment of chronic inflammatory and autoimmune diseases Journal of Inflammation Research, 2015
- Is it safe to stick a wire into the ground port of a wall electrical outlet and wrap it around your ankle or wrist? Earthing (manufacturer help center), 2020 · manufacturer
- Do I need an electrician to check my outlets before I use Earthing® products? Earthing (manufacturer help center), 2020 · manufacturer
- Complaint 25/261: Premium Grounding (website) Advertising Standards Authority (New Zealand), 2025 · regulator
- A randomized, double-blind, placebo-controlled study on the improvement of sleep quality with Earthing mat Advances in Integrative Medicine, 2025 · randomized trial
- What is grounding and could it improve my sleep? CQUniversity Australia (republished from The Conversation), 2025 · news
How this was written. Written from the sources listed above, checked . It is general information, not medical advice. Talk to a clinician before acting on anything here if you have a health condition or take medication.
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