What Copper Is Sold As
The pitch has been remarkably stable for fifty years. Copper ions migrate through the skin. They correct something the arthritic body is short of, or they damp down the inflammation in the joint, or they do both. The bracelet turns your wrist green because it is working — that green mark is the copper going in. Wear it long enough and the ache softens.
The modern version wraps the same idea in athletic fabric. Copper-infused sleeves, copper compression gloves, copper knee supports, copper socks. The garment squeezes, the copper heals, and the two together are supposed to be more than either alone. Search for arthritis gloves and a large share of what comes back is coloured a distinctive brown-orange for exactly this reason.
What makes copper unusual among wellness claims is that somebody actually ran the experiment. Twice. With dummy devices, double-blinding, crossover designs and real inflammatory markers drawn from real blood. We reviewed the published evidence rather than the marketing, and this page reports what those trials found. It sits alongside our companion review of whether compression gloves help arthritis and our practical compression gloves buying guide.
What the Research Actually Found
Two trials dominate this literature, and they come from the same research group at the University of York. They are small by drug-trial standards but they are well designed, and crucially they solve the problem that makes copper so hard to evaluate: you cannot hide a copper bracelet from the person wearing it unless you give them something that looks just like one.
The 2009 osteoarthritis trial
Richmond and colleagues recruited 45 people aged 50 and over with diagnosed osteoarthritis from rural and urban general practices in Yorkshire. Over 16 weeks, each participant wore four different devices in random order: a standard magnetic wrist strap, a weak magnetic strap, a demagnetised strap, and a copper bracelet. Because every participant wore every device, each person served as their own control.
The primary outcome was the pain subscale of the WOMAC osteoarthritis index, supported by the McGill Pain Questionnaire Pain Rating Index, a pain visual analogue scale, and a record of medication use. No difference emerged between the devices on any of the three pain measures, nor on stiffness or physical function. The authors' conclusion was blunt: magnetic and copper bracelets are generally ineffective for managing pain, stiffness and physical function in osteoarthritis, and reported therapeutic benefits are most likely attributable to non-specific placebo effects.
In the interest of reporting the evidence rather than curating it: one subscale of the Pain Rating Index did reach statistical significance in favour of the magnetic device (P = 0.025). The authors themselves flagged that no correction had been applied for multiple comparisons — when you test enough subscales, one of them will cross the line by chance. It did not favour copper in any case.
The 2013 rheumatoid arthritis trial is the stronger one
Four years later the same group ran a larger and longer version in inflammatory disease, published in PLoS ONE. Seventy adults with painful rheumatoid arthritis, aged 33 to 79 and predominantly female, were recruited from Yorkshire general practices. Again each person wore four devices — a standard magnetic wrist strap rated at 2,212 gauss, an attenuated magnetic strap at 303 gauss, a demagnetised dummy strap below 20 gauss, and a copper bracelet — this time for five weeks each, separated by one-week washout periods, across roughly five months. Sixty-five provided complete data.
This design gives copper two separate chances to prove itself: against an inert strap, and against a set of magnetic devices that were themselves under suspicion. It failed both.
The copper bracelet produced a mean pain score of 53.03 on a 100 mm visual analogue scale. The demagnetised dummy strap — a piece of jewellery with no claimed active ingredient at all — produced 53.37. Analysis of variance across all four devices returned p = 0.18. The standard deviations sat above 22 points in every arm, which is another way of saying the differences between devices were lost inside the ordinary week-to-week noise of living with rheumatoid arthritis.
The secondary outcomes closed off the remaining escape routes. The McGill Pain Questionnaire Pain Rating Index showed no significant difference even after adjusting for medication use (p = 0.08). Tender joint count: p = 0.17. Self-reported disease activity: p = 0.48. A composite disease activity measure: p = 0.52. Disability on the Health Assessment Questionnaire showed no significant differences. Neither did swollen joint count.
The authors' stated conclusion: wearing a magnetic wrist strap or a copper bracelet did not appear to have any meaningful therapeutic effect, beyond that of a placebo, for alleviating symptoms and combating disease activity in rheumatoid arthritis. Stewart Richmond, who led both trials, put it more plainly to his university's press office: it is a shame that these devices do not seem to have any genuine benefit.
Where the story came from in the first place
The study sellers still gesture at is Walker and Keyszer's 1976 work in Agents and Actions, which examined dermal assimilation of copper in arthritic and rheumatoid conditions. It ran with over 300 arthritis sufferers — around half of whom already wore copper bracelets — comparing copper against anodised aluminium bracelets made to resemble copper, with questionnaire follow-up. It weighed the bracelets before and after wear, established that they lose copper into sweat, and reported that a significant number of subjects appeared to derive some therapeutic value.
That paper is worth taking seriously on one point and not on the other. The chemistry holds up: copper does dissolve into sweat and some crosses the skin, which is why copper jewellery leaves a green mark. The clinical claim does not. A questionnaire study, in a population half-composed of people who had already bought into copper bracelets, asking them how they felt, is not a design that can distinguish a working treatment from a popular one. Fifty years later, when the question was asked with dummy devices and blood tests, the answer changed.
Claims vs Evidence
Every claim below is one we found being made in copper product marketing. Here is what the published research supports, and how confident anyone can reasonably be.
| The claim | What the evidence shows | Confidence |
|---|---|---|
| "Copper bracelets relieve arthritis pain" | Not supported. Two double-blind crossover trials with dummy devices — 45 people with OA (2009) and 70 with RA (2013) — found no difference on any pain measure. Copper scored 53.03 against 53.37 for an inert strap on a 100 mm scale. | High confidence this is wrong. |
| "Copper reduces inflammation in the joints" | Not supported, and this was measured properly. C-reactive protein and plasma viscosity showed no differences between devices, nor did swollen joint count, tender joint count (p = 0.17) or composite disease activity (p = 0.52). | High confidence this is wrong. |
| "Copper is absorbed through your skin" | True, and beside the point. Bracelets measurably lose copper into sweat (Walker and Keyszer, 1976) — that is the green stain. What has never been shown is that this reaches a joint in a quantity that does anything, and arthritis is not caused by copper deficiency. | High that absorption happens; high that it does not help. |
| "Copper-infused fabric works the same way" | Untested, and implausible. No controlled trial has isolated copper fabric as a variable in arthritis. It leans on the same transdermal mechanism the bracelet trials failed to find, while delivering far less metallic copper to the skin than a solid bracelet does. | Low — an absence of evidence, not a negative trial. But there is no reason to expect a different answer. |
| "Copper compression gloves ease hand arthritis" | Partly — but neither the copper nor the compression is the likely reason. In the A-GLOVES trial (n = 206), real compression gloves at 23–32 mmHg beat deliberately loose placebo gloves by 0.10 points on a 0–10 pain scale (p = 0.72). Warmth and expectation explain most of it. | Moderate that the garment helps a little; high that copper contributes none of it. |
| "Thousands of reviewers say it works" | True and uninformative. Over 70% of A-GLOVES participants wearing gloves engineered to apply no pressure reported benefit and wanted to continue. Richmond attributes copper's reputation to placebo plus symptoms naturally subsiding after a flare. | High — reviews genuinely cannot answer this question. |
| "Copper protects your joints or slows the disease" | No evidence whatsoever, and this one was specifically tested. The 2013 trial measured disease activity and inflammatory markers directly and found nothing. | High confidence this is false. Treat it as a red flag on any seller who claims it. |
| "It's harmless, so there's no downside to trying" | Mostly true, with one real caveat. Copper bracelets are described as safe; the usual complaint is a green skin stain. The Arthritis Foundation's concern is not toxicity but people using them in lieu of effective treatment. | Moderate — physically low risk, but delay is a genuine cost in inflammatory arthritis. |
| "Clinically proven pain relief" (as marketed) | The US Federal Trade Commission disagreed. In 2015 it charged a leading copper-infused compression apparel brand with deceptive advertising over claims its garments relieved severe and chronic arthritis pain, including claims of relief comparable to or better than drugs or surgery. | High confidence the marketing claim is unsubstantiated. |
The Placebo Problem, and Why Testimonials Are Worthless Here
Copper products carry enormous numbers of glowing reviews. Those reviews are real — people are not lying about feeling better. The problem is that this particular claim, in this particular condition, is close to the worst-case scenario for learning anything from personal experience.
Richmond named the two mechanisms directly. First, devices like these provide a placebo effect for users who believe in them. Second, and less discussed, people normally begin wearing them during a flare-up period, and then as their symptoms subside naturally over time they confuse this with a therapeutic effect. Arthritis pain varies enormously week to week. Nobody buys a copper bracelet on a good day. Whatever you put on your wrist during the worst fortnight of your year is going to look effective a month later.
There is a third factor that makes copper especially slippery, and it is one we ran into writing the companion piece on compression gloves. In the A-GLOVES randomised trial, more than 70% of participants wearing placebo gloves — gloves deliberately fitted at least one size too large so they applied essentially no pressure — said the gloves were beneficial and wanted to keep wearing them. That is the base rate of enthusiasm for putting something on a sore hand. A copper glove has to beat that, not beat nothing.
Is Copper-Infused Fabric Different From a Copper Bracelet?
This is the fairest objection to everything above, and it deserves a straight answer rather than a dismissal. The trials tested solid metallic copper bracelets worn against the wrist. A copper compression glove is something else: a synthetic knit with copper or copper-oxide particles bonded into or onto the fibres. They are not the same product, and we should not pretend one trial settles the other.
So here is the honest position. Copper-infused fabric has not been tested against a copper-free identical garment in arthritis. We could not find a controlled trial that isolates the copper as a variable. That is an absence of evidence, not a negative result, and anyone telling you copper fabric has been disproven is overstating what exists.
But three things make it very hard to be optimistic:
- It runs on the same engine. The proposed mechanism for copper fabric is the one the bracelet trials tested and could not find: copper crossing the skin and reducing joint inflammation. That mechanism was given five weeks of continuous contact, in seventy people, with blood tests, and produced nothing.
- It delivers less copper, not more. A bracelet is solid metal in direct sustained contact with sweat — the 1976 work could literally weigh the copper it lost. Particles embedded in a knit, separated from the skin by fibre, are a weaker version of the same exposure. If the strong dose does nothing, the weak dose doing something would be a surprising result.
- The regulator has already looked at the claims. In December 2015 the US Federal Trade Commission charged a major copper-infused compression apparel company with deceptively advertising that its garments would relieve severe and chronic pain and inflammation caused by arthritis and other diseases, including advertising that suggested relief comparable to or better than drugs or surgery. The company and its founder paid 1.35 million US dollars in settlement against a judgment of 86.8 million that was partially suspended, and the order requires competent and reliable scientific evidence before any future health claims. The FTC's own consumer advice at the time was to talk to a healthcare professional before spending money on any product promising to replace drugs or surgery.
Our reading: buying a copper-infused garment is not buying a treatment. It may still be buying a perfectly good garment. Judge it on fit, warmth, durability and comfort, and treat the copper as a colour scheme.
What This Means for Copper Compression Gloves Specifically
Most people arriving at this question are not shopping for a bracelet. They are looking at a pair of brown-orange gloves and wondering whether the copper version is worth choosing over the plain one. That question has two layers, and they are worth separating carefully because they have different answers.
Layer one: does the copper add anything?
On the evidence above, almost certainly not. There is no trial support for copper as an active ingredient, direct negative evidence against the mechanism it relies on, and a regulatory finding that the pain-relief claims made for copper-infused compression clothing were unsubstantiated. Do not pay a premium for the copper, and do not let a copper listing outrank a better-fitting plain one.
Layer two: does the glove itself help?
Here the answer is more generous, and it is the conclusion we reached in our review of whether compression gloves help arthritis. Gloves probably do make hands feel somewhat better. What the evidence does not support is that the compression is why. In the A-GLOVES randomised controlled trial, 206 people with rheumatoid or undifferentiated inflammatory arthritis were given either genuine compression gloves rated at 23–32 mmHg or deliberately loose placebo gloves. After 12 weeks the adjusted difference in hand pain was 0.10 points on a 0–10 scale, with a p value of 0.72 — and over 70% of both groups reported benefit. Warmth, comfort and expectation are the leading explanations.
If you want to try a glove on that basis, buy it as a glove. Two honest starting points: plain fingerless wool gloves for warmth, which is roughly what the A-GLOVES authors themselves suggested patients buy, or open-fingertip arthritis gloves if you prefer the snugger fit. Our compression gloves guide covers sizing, materials and open versus full-finger designs in detail. Choose on fit and warmth, ignore the mmHg rating, and ignore the copper.
What Genuinely Does Help Hand Arthritis
Concluding that copper does nothing is only useful if it redirects you somewhere better. Several things have far stronger support, and none of them are exotic.
Warmth, which appears to be the real active ingredient in this whole category
If your hands ache more when they are cold and ease when they are warm, that is a direct, cheap, well-tolerated intervention, and it is the mechanism the glove evidence actually points at. A warm room, a hot drink held between both hands, ordinary gloves. No claim required.
Joint protection technique
The least glamorous item on the list and often the most useful. Use larger joints instead of smaller ones — forearms instead of fingers, a whole hand instead of a pinch grip. Avoid sustained tight grips. Spread load across both hands. Break long tasks into shorter ones. None of it costs anything, and it addresses the actual thing that hurts: force going through small inflamed joints.
Adaptive tools that cut how much grip you need
This is the intervention we think is most undersold, because it attacks the cause rather than padding the symptom. If a jar lid needs 40% less torque, your thumb joint does 40% less work every time. Practical starting points: opening jars with arthritic hands, which covers technique first and then the tools that genuinely help, and arthritis-friendly kitchen tools for the rest of the meal. A glove does not reduce the force a task demands. A better tool does.
Splints and braces, where they are indicated
Unlike copper, orthoses have real guideline support for specific problems — particularly at the base of the thumb. If your pain is concentrated at the wrist or the thumb base rather than spread across the finger joints, that is a different piece of equipment and a much stronger recommendation than anything on this page; our wrist brace guide covers the options. This is worth raising with a hand therapist rather than self-prescribing, because the right splint depends on which joint is the problem.
Actual treatment, if the arthritis is inflammatory
Covered below, and the single most important item here.
When to See a Doctor Instead of Buying Copper
This page is general information, not medical advice. It is also the section we would most like you to act on, because the real cost of a copper bracelet is almost never the money.
This is the specific harm the Arthritis Foundation flags about copper and magnets. Their concern is not that the devices are dangerous — they describe them as safe and inexpensive — but that people may use them in lieu of effective treatment rather than as an add-on. In inflammatory arthritis there is a window in which disease-modifying treatment protects your joints from permanent damage. Copper does not extend that window, and nothing in two randomised trials suggests it does anything inside it.
If you have already been diagnosed and you simply want your hands to feel better day to day, wearing copper is a low-stakes choice and we are not going to tell you to take your bracelet off. Just know what you are buying: a piece of jewellery, a warm glove, or a hopeful habit. Not a treatment.
Frequently Asked Questions
No. Two randomised double-blind placebo-controlled crossover trials, both led by Stewart Richmond at the University of York, tested copper bracelets against dummy devices and found nothing. The 2009 trial in Complementary Therapies in Medicine gave 45 people with osteoarthritis four devices in random order over 16 weeks, including a copper bracelet, and found no difference between them on pain, stiffness or physical function. The 2013 trial in PLoS ONE did the same in 70 people with rheumatoid arthritis over five months, and found no difference in pain, disability, inflammatory blood markers, disease activity or medication use. Mean pain scores were 53.03 for the copper bracelet and 53.37 for a demagnetised dummy strap on a 100 millimetre scale — a gap of about a third of a millimetre. The authors concluded that wearing a copper bracelet did not appear to have any meaningful therapeutic effect beyond that of a placebo.
There is no evidence the copper adds anything, and the more interesting problem is that the compression may not be doing much either. No controlled trial has isolated copper-infused fabric as a variable in hand arthritis, so strictly speaking it is untested rather than disproven — but it relies on the same transdermal copper theory that failed in the bracelet trials, and a solid copper bracelet delivers far more metallic copper to the skin than a woven thread does. Separately, the A-GLOVES randomised trial of 206 people found that genuine compression gloves rated at 23 to 32 mmHg performed no better than deliberately loose placebo gloves, with an adjusted difference of 0.10 points on a 0 to 10 pain scale. If a copper compression glove makes your hands feel better, the most likely reason is that it is a glove and your hands are warm.
Some copper does dissolve into sweat and cross the skin, but there is no evidence it reaches an arthritic joint in a quantity that changes anything. The 1976 Walker and Keyszer study that gave the modern copper bracelet industry its scientific-sounding story weighed bracelets before and after wear and showed they lose copper into sweat, so that part is real — it is also why copper jewellery leaves a green mark. What has never been demonstrated is the step that matters. Arthritis UK states plainly that the copper in the bracelet cannot be absorbed into your joint in any way, and that there is no evidence arthritis is caused by a shortage of copper in your body. The Arthritis Foundation describes the skin-absorption rationale as unfounded.
Because arthritis pain fluctuates, and people usually start wearing a bracelet when their symptoms are at their worst. Stewart Richmond, who led both trials, gave two reasons: devices like these provide a placebo effect for users who believe in them, and people normally begin wearing them during a flare up period and then as their symptoms subside naturally over time they confuse this with a therapeutic effect. The A-GLOVES glove trial showed the same trap from another angle — more than 70 percent of people wearing deliberately loose placebo gloves that applied no pressure at all said the gloves helped and wanted to keep wearing them. Testimonials cannot separate a device that works from a device someone happened to put on during a bad week, which is exactly why blinded trials with dummy devices exist.
Physically, very little — the realistic risk is what you do not do instead. Copper bracelets are widely described as safe, and the usual complaint is cosmetic: a green stain on the skin where copper reacts with sweat. The Arthritis Foundation's stated concern is not toxicity but that people may use these devices in lieu of effective treatment rather than as an add-on. That matters most in inflammatory arthritis, where the NHS says diagnosing rheumatoid arthritis quickly is important because early treatment can prevent it getting worse and reduce the risk of joint damage. Wearing copper costs you very little. Spending six months wearing copper instead of having persistent joint swelling and morning stiffness assessed can cost you joints.
Bottom Line
Copper is one of the few wellness claims that has been tested the way you would want it tested — double-blind, against dummy devices that look and feel the same, in two randomised crossover trials, with blood drawn to check the inflammation story rather than just asking people how they felt. Copper failed both times. No effect on pain, stiffness, physical function, disability, inflammatory markers, disease activity or painkiller use. In the rheumatoid arthritis trial a copper bracelet and an inert demagnetised strap were separated by a third of a millimetre on a 100 mm pain scale.
Copper-infused fabric is a slightly different product and has never been isolated in a controlled trial, so we will not claim it has been disproven. We will say that it depends on the same mechanism that failed, delivers less copper than the version that failed, and had its pain-relief marketing found unsubstantiated by the FTC in 2015. If you want to believe copper fabric works, you are relying on hope rather than evidence, and you should at least not pay extra for it.
None of this means a copper compression glove will do nothing for you. It means the copper will not be the reason — and, on the evidence we reviewed for our compression gloves review, neither will the compression. Warmth is the ingredient that survives scrutiny, and warmth is cheap. Buy gloves as gloves, judge them on fit and comfort, and put the difference toward things with better evidence: joint protection technique, heat, hand exercise, and tools that lower the force your hands have to produce — our guides to opening jars and arthritis-friendly kitchen tools are the practical end of that.
And the thing we would most want you to take away: persistent joint pain, swelling or morning stiffness should be assessed by a doctor, because inflammatory arthritis needs early treatment. The Arthritis Foundation's worry about copper is not that it hurts you. It is that people wear it instead of getting treated. That is the only way a harmless bracelet does real damage.
Sources
These are the papers and authority pages we read in researching this article. Where we have quoted a figure, it comes from one of these.
- Richmond SJ, Gunadasa S, Bland M, MacPherson H. "Copper bracelets and magnetic wrist straps for rheumatoid arthritis — analgesic and anti-inflammatory effects: a randomised double-blind placebo controlled crossover trial." PLoS ONE 2013;8(9):e71529 — 70 adults with painful RA (65 complete data), aged 33–79, 52 female; four devices each worn 5 weeks with 1-week washouts: standard magnetic strap (2,212 gauss), attenuated magnetic strap (303 gauss), demagnetised strap (<20 gauss) and a copper bracelet. Mean pain VAS: copper 53.03 (SD 24.30), demagnetised dummy 53.37 (SD 22.23), attenuated magnet 49.98, standard magnet 48.23; ANOVA across devices p = 0.18. McGill PRI p = 0.08, tender joint count p = 0.17, self-reported disease activity p = 0.48, composite disease activity p = 0.52; no differences in HAQ disability, CRP, plasma viscosity or swollen joint count; no meaningful difference in analgesic, NSAID or DMARD use; blinding held. Conclusion: no meaningful therapeutic effect beyond that of a placebo. Also available via PMC and PubMed.
- Richmond SJ, Brown SR, Campion PD, et al. "Therapeutic effects of magnetic and copper bracelets in osteoarthritis: a randomised placebo-controlled crossover trial." Complementary Therapies in Medicine 2009;17(5–6):249–256 — 45 people with osteoarthritis aged 50+, recruited from Yorkshire general practices; 16-week double-blind crossover across a standard magnetic strap, weak magnetic strap, demagnetised strap and a copper bracelet. No difference between devices on the primary outcome (WOMAC A pain), the McGill Pain Rating Index or pain VAS, nor on stiffness or physical function; one PRI subscale favoured the magnetic device (P = 0.025) with no correction for multiple comparisons. Conclusion: magnetic and copper bracelets are generally ineffective for pain, stiffness and physical function in osteoarthritis, and reported benefits are most likely attributable to non-specific placebo effects.
- Walker WR, Keyszer DM. "An investigation of the therapeutic value of the 'copper bracelet' — dermal assimilation of copper in arthritic/rheumatoid conditions." Agents and Actions 1976;6(4):454–459 — the origin study, with over 300 arthritis sufferers (around half of whom already wore copper bracelets), comparing copper bracelets against anodised aluminium placebos made to resemble copper, with questionnaire follow-up. Bracelets were weighed before and after wear, establishing that copper dissolves into sweat; the authors reported that a significant number of subjects appeared to derive some therapeutic value. Uncontrolled for belief and never replicated under blinded conditions.
- University of York — "Copper bracelets and magnetic wrist straps fail to help rheumatoid arthritis, says York research" (2013) — the trial team's own summary. Richmond on why the devices have a reputation: they provide a placebo effect for users who believe in them, and people normally begin wearing them during a flare up period, then confuse naturally subsiding symptoms with a therapeutic effect. He adds that pain varies greatly over time in conditions like rheumatoid arthritis, and suggests people may be better off saving their money or spending it on interventions with better evidence, such as dietary fish oils.
- Arthritis Foundation — "Magnets, Copper Don't Ease Arthritis Pain" — cites Richmond's work and reports no improvements beyond the placebo effect for magnetic bands or copper bracelets on pain, stiffness or swelling in RA or OA; describes the copper skin-absorption rationale as unfounded; notes the devices are safe and inexpensive but warns against using them in lieu of effective treatment rather than as an add-on.
- Arthritis UK — Copper bracelets — states there is no scientific or medical evidence that copper bracelets offer any benefit, that the copper in the bracelet cannot be absorbed into your joint in any way, and that there is no evidence arthritis is caused by a shortage of copper in the body; describes them as safe to use but unsupported by current research.
- US Federal Trade Commission — "Tommie Copper to pay $1.35 million to settle FTC deceptive advertising charges" (December 2015) — the FTC charged that the company deceptively advertised copper-infused compression clothing as relieving severe and chronic pain and inflammation caused by arthritis and other diseases, including claims of relief comparable to or better than drugs or surgery, supported by celebrity and consumer testimonials. Settlement of 1.35 million US dollars against a partially suspended judgment of 86.8 million; the order requires competent and reliable scientific evidence for future health claims. FTC advice: talk to a healthcare professional before spending money on a product that promises to replace drugs or surgery.
- Hammond A, Prior Y, Cotterill S, et al. "Clinical and cost effectiveness of arthritis gloves in rheumatoid arthritis (A-GLOVES): randomised controlled trial with economic analysis." BMC Musculoskeletal Disorders 2021;22(1):47 — 206 participants randomised to genuine compression gloves (23–32 mmHg) or deliberately loose placebo gloves; hand pain fell 1.0 vs 1.2 points, adjusted difference 0.10 (95% CI −0.47 to 0.67; p = 0.72); over 70% of both arms reported benefit and wanted to continue. The basis for our companion review of whether compression gloves help arthritis.
- NHS — Rheumatoid arthritis — advises seeing a GP if you think you have symptoms of rheumatoid arthritis so the underlying cause can be identified, and states that diagnosing rheumatoid arthritis quickly is important because early treatment can prevent it getting worse and reduce the risk of joint damage.
Evidence changes, and we will update this page if it does. The two bracelet trials are modest in size, and neither tested copper-infused textiles, which remain genuinely unstudied in arthritis rather than studied and rejected. What would change our verdict is a blinded trial comparing a copper-infused garment against an identical copper-free one. Until that exists, the most defensible reading of the literature is that copper is inert here.