Written by the Nuvirox Research Team
Key Points
- DMSO (dimethyl sulfoxide) is a solvent that's been studied on its own for osteoarthritis, but it's also the carrier ingredient in several prescription topical diclofenac products — and a lot of the "evidence" people cite for DMSO is really evidence for the diclofenac inside it.
- A rigorous meta-analysis pooling three trials of DMSO or MSM alone against placebo found a small, statistically non-significant reduction in pain.
- Government and health-authority reviews (NCCIH among them) describe the DMSO-alone evidence as too limited to draw conclusions, while flagging safety questions including skin irritation and unknown long-term effects.
Short answer: no, not convincingly — at least not DMSO by itself. The best-designed trials that isolated DMSO from other active drugs found effects too small to call significant. Most of the positive-sounding research people reference for "DMSO and joint pain" actually tested topical diclofenac dissolved in a DMSO carrier, which is a different question with a different, better-supported answer.
Why is DMSO evidence so confusing?
DMSO is a small, highly penetrating solvent molecule, which made it attractive as a way to help other drugs cross the skin. That property led to it being used as the delivery vehicle in topical diclofenac solutions (the kind studied in large trials of over 700 patients with knee osteoarthritis) — but in those trials, the drug doing the work was diclofenac, an NSAID, not the DMSO itself. When people search for "DMSO joint pain" and find studies showing meaningful pain relief, they're very often finding this diclofenac-in-DMSO research, which doesn't answer whether DMSO alone does anything.
What happens when researchers test DMSO by itself?
A smaller, separate body of research has looked at DMSO (and its close chemical relative MSM) without an added drug. This is the evidence that actually answers "does DMSO help joint pain" as most people mean the question.
What human studies actually show
A meta-analysis pooling the DMSO-alone and MSM-alone trials found no significant pain benefit. Brien and colleagues systematically searched for randomized trials testing DMSO or MSM against placebo, without other active drugs. After screening 7 potential trials, only three met the quality bar (two DMSO, one MSM; 326 patients total). Pooling them, the meta-analysis found a non-significant reduction in pain of about 6.3 mm on a 100 mm visual analog scale (95% CI, -0.5 to 13.2) — a number too small and too uncertain to call a real effect (Evid Based Complement Alternat Med, 2011; PMC3135791).
Individual trials within that pool were mixed. Two of the three included trials found statistically significant but "not clinically relevant" pain reductions compared with placebo; the third found no difference at all between DMSO and placebo. That's a pattern researchers describe as a signal too weak and inconsistent to build a recommendation on.
The distinct, better-supported finding is about diclofenac delivered via DMSO. The 775-patient trial often cited in this space (a 12-week, five-arm study comparing topical diclofenac-in-DMSO, DMSO vehicle alone, oral diclofenac, and placebo) found the diclofenac arms effective for knee osteoarthritis pain — but this is evidence for topical NSAID therapy, and it's precisely designed to let researchers separate the DMSO vehicle's effect (modest) from the drug's effect (larger). That structure is itself useful confirmation that DMSO alone isn't doing the heavy lifting in these formulations.
The U.S. National Center for Complementary and Integrative Health summarizes the state of play plainly: "Only a small amount of research has been conducted on DMSO or MSM for osteoarthritis. No conclusions can be reached about whether either of these substances is helpful."
What DMSO won't do, and safety notes
Even setting efficacy aside, pure DMSO carries safety considerations that formulated diclofenac-DMSO products are designed to manage. Reported side effects include skin irritation, a garlic-like taste and body odor (DMSO is absorbed through skin and metabolized to a sulfur compound your body then exhales and secretes), and digestive upset. Industrial-grade DMSO sold outside pharmaceutical channels isn't standardized for topical human use and can carry impurities; that's a meaningfully different product from what's tested in clinical trials. If you have any interest in trying it, that distinction — and a conversation with a pharmacist or doctor about product quality and interactions — matters more here than for most topical joint remedies.
FAQ
Is DMSO the same thing as MSM?
No, though they're chemically related and often studied together. MSM (methylsulfonylmethane) is typically taken as an oral supplement; DMSO is applied topically. Both have similarly thin, inconclusive evidence bases on their own for joint pain.
If DMSO alone doesn't help much, does that mean topical diclofenac doesn't work either?
No — that's the opposite conclusion. Topical diclofenac (an NSAID, available over the counter as Voltaren and by prescription in some formulations) has solid trial support for knee osteoarthritis pain. The point is that credit for that effect belongs to the diclofenac, not the DMSO carrier it's dissolved in.
Is DMSO safe to use on skin at all?
Pharmaceutical-grade DMSO used in studied formulations has an established safety profile for short-term topical use, with skin irritation being the most common issue. Non-pharmaceutical-grade DMSO sold as an industrial solvent is a different matter and isn't something dermatologists recommend applying to skin.
Why does DMSO make some people's breath and skin smell like garlic?
This is a well-documented, harmless (if unpleasant) side effect. DMSO is absorbed through the skin and metabolized in the body to dimethyl sulfide, a volatile sulfur compound that's then exhaled through the lungs and released through skin, producing the characteristic odor. It's not a sign of a reaction going wrong; it's simply how the compound is processed and cleared, and it typically appears within minutes of topical application and can persist for hours.
How this compares to other topical options
For a joint pain topical, the ingredients with the clearer evidence base are diclofenac (an NSAID) and capsaicin, both discussed elsewhere in our research library. DMSO's main claim — that it's an effective penetration enhancer — is likely true; its claim to independently reduce joint pain is the part the evidence doesn't back up nearly as well.
From Nuvirox
Why we formulated Joint+ Restore
Joint+ Restore is built around a simple idea: pull together the joint-support compounds with the most consistent human research behind them, at levels that reflect what those trials actually used, rather than a token amount of a dozen trendy ingredients. Joint+ Restore is currently being reformulated, so we're not listing specific ingredient amounts here — but the underlying approach stays the same, and every version ships with our 60-day money-back guarantee, which is long enough to actually judge whether a joint supplement is doing anything for you the way the research says you should.
Learn more about Joint+ Restore →The bottom line
DMSO by itself has thin, inconsistent trial support for joint pain — a proper meta-analysis of DMSO-alone and MSM-alone trials found the pooled effect too small to call significant. The stronger evidence people often point to is really evidence for diclofenac, an NSAID that happens to be delivered using DMSO as a carrier. If topical relief is what you're after, our overview of joint supplement ingredients ranked by evidence and our note on joint supplement safety are better starting points than DMSO alone.
References
- Brien S, Prescott P, Lewith G. Meta-Analysis of the Related Nutritional Supplements Dimethyl Sulfoxide and Methylsulfonylmethane in the Treatment of Osteoarthritis of the Knee. Evid Based Complement Alternat Med. 2011. PMC3135791.
- Systematic review of the nutritional supplements dimethyl sulfoxide (DMSO) and methylsulfonylmethane (MSM) in the treatment of osteoarthritis. Osteoarthritis and Cartilage. 2008.
- Bookman AA, Williams KS, Shainhouse JZ. Effect of a topical diclofenac solution for relieving symptoms of primary osteoarthritis of the knee: a randomized controlled trial. CMAJ. 2004;171:333-8.
- National Center for Complementary and Integrative Health. Dimethyl Sulfoxide (DMSO) and Methylsulfonylmethane (MSM) for Osteoarthritis.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.