DMSO cream is a topical formulation whose only FDA-approved human use is treating interstitial cystitis, despite widespread marketing for arthritis and pain.
Understanding what is DMSO cream starts with one critical fact: this chemical solvent’s only FDA-approved human use is treating interstitial cystitis, yet unregulated versions are marketed for almost everything. A garlic-like taste in your mouth after rubbing cream on your skin is one of the stranger signs that DMSO has entered your bloodstream—and that absorption is exactly why the product attracts both medical interest and serious safety warnings. Below, we separate the FDA-approved use from the unregulated market, the concentrations that matter, and the risks you need to know before buying.
What Exactly Is DMSO Cream?
DMSO cream is a topical product containing dimethyl sulfoxide, a colorless chemical solvent derived from wood pulp. It’s a polar, aprotic solvent that mixes with water and can dissolve both polar and nonpolar molecules—an unusual property that lets it penetrate skin quickly.
That skin-penetration ability is the source of both its medical use and its risks. DMSO carries whatever is dissolved in it through the skin barrier, which means impurities or contaminants in unregulated products enter the bloodstream along with the DMSO itself. The compound also produces a distinctive garlic-like taste and odor in the mouth within minutes of skin contact as it’s metabolized and exhaled.
The Only FDA-Approved Human Use For DMSO
The FDA has approved DMSO for exactly one human condition: interstitial cystitis, a chronic bladder pain disorder. It’s sold as Rimso-50® (generic name RIMSO-50), a 50% solution administered by a healthcare provider via catheter or syringe infusion directly into the bladder during a clinic or hospital visit. The approval dates to 1970, and a generic version was approved in 2002.
Every other use—arthritis, strains, sprains, shingles, pain relief, inflammation—is off-label or entirely unregulated, backed by thin or nonexistent scientific evidence. WebMD’s DMSO overview notes that the American Cancer Society has found no evidence supporting DMSO for cancer treatment, and using it may delay proper medical care. Health Canada’s assessment states DMSO has not shown anti-inflammatory benefit and may act only as a counter-irritant.
DMSO Cream Forms And Concentrations Available
DMSO is sold in three main forms—cream, gel, and solution—with concentrations ranging from 5% to 99%. The regulation status varies dramatically by product type and intended use. The table below maps the common formulations against their legal status and typical applications.
| Product Type | Concentration | Regulation Status | Primary Use |
|---|---|---|---|
| Unregulated DMSO cream | 5%–90% | Not FDA-approved for human medical use | Self-directed arthritis and pain relief |
| Rimso-50® (solution) | 50% | FDA-approved, prescription only | Interstitial cystitis (bladder instillation) |
| 77% DMSO cream | 77% | Off-label medical protocol | Chemotherapy extravasation (every 3–8 hours for 10–14 days) |
| Domoso® veterinary gel | ~90% | FDA-approved for animal use | Acute swelling in dogs and horses |
| 99% pure DMSO gel | 99% | Unregulated | Self-directed use (high risk of adverse effects) |
| Medical DMSO solution | 50% | Prescription only | Bladder irrigation under medical supervision |
| Commercial DMSO cream | Varies | Unregulated, no oversight | General pain and inflammation claims |
What People Use DMSO Cream For Vs What Science Shows
DMSO cream is marketed for arthritis, joint pain, muscle strains, and minor skin irritations, but the scientific evidence for these uses is weak. Health Canada reports that DMSO has not demonstrated anti-inflammatory benefits in controlled studies, and the American Cancer Society states there is no reliable evidence it treats any form of cancer.
The gap between marketing and evidence is wide. Unregulated product labels often list conditions the FDA has never evaluated for DMSO, and users rely on anecdotal reports rather than clinical data. The one area where DMSO has shown promise under medical supervision is chemotherapy extravasation—a 77% cream applied every 3–8 hours for 10–14 days is used off-label to limit tissue damage from leaked chemotherapy drugs. This is a hospital protocol, not something to self-prescribe.
DMSO Cream Safety: Risks You Should Know
The risks of DMSO cream range from mild skin irritation to dangerous systemic effects, and they increase with concentration and impurity level. The table below summarizes the key safety concerns and who is most vulnerable.
| Risk Factor | Details | Who Should Avoid Or Be Cautious |
|---|---|---|
| Skin irritation | Burning, itching, redness at the application site | Anyone with sensitive skin or open wounds |
| Garlic-like odor and taste | DMSO metabolite exhaled through breath and skin; harmless but strong | May be unpleasant; not a safety risk |
| Contaminant exposure | Industrial-grade DMSO contains paint thinner residues and other impurities absorbed through skin | Anyone using non-pharmaceutical-grade products |
| Eye toxicity | Even a 0.1% concentration can damage the eye | Keep away from the face; handle carefully |
| Drug interactions | DMSO increases absorption of other substances, potentially magnifying effects of medications | Anyone on prescription drugs should consult a doctor first |
| Pregnancy and breastfeeding | Unknown effects on fetus or infant; animal studies show birth defects | Pregnant and nursing women should not use DMSO |
| High-concentration danger | Concentrations above 90% can cause deadly reactions | All users; 99% products carry the highest risk |
Unregulated DMSO products purchased online or from health food stores may contain contaminants, undisclosed medications, or inaccurate concentration labels. Canada’s health authority advises obtaining DMSO only through a pharmacy with a prescription. In the U.S., Rimso-50® is prescription-only, but unregulated creams and gels are sold without oversight across many retail channels.
Where To Find DMSO Cream
If you’re considering DMSO cream despite the limited evidence and safety concerns, your options fall into two categories: prescription-only Rimso-50® from a doctor for interstitial cystitis, and unregulated products from health food stores, online retailers, and feed stores. The unregulated market includes brands like Perfectly Healthy and Lay’s Western Wear and Feed, among others.
For readers who have weighed the risks and want to explore DMSO cream products available without a prescription, our tested roundup of top-rated DMSO creams breaks down formulation, source quality, and user-reported results to help you make an informed choice.
FAQs
Is DMSO cream legal to buy in the United States?
Yes, unregulated DMSO creams and gels are sold legally without a prescription in the U.S. through health food stores, online retailers, and feed stores. Only the bladder-instillation solution Rimso-50® requires a prescription, and it is the only FDA-approved DMSO product for human use.
Does DMSO cream actually relieve arthritis pain?
No rigorous clinical trials confirm that DMSO cream relieves arthritis pain. Health Canada states the compound has not shown anti-inflammatory benefits in controlled studies, and any reported relief may come from a counter-irritant effect or placebo response rather than a direct anti-inflammatory mechanism.
What does DMSO cream smell like?
DMSO cream itself has a slight garlic-like odor, and users often notice a strong garlic or oyster-like taste in their mouth within minutes of application. This happens because DMSO is metabolized into dimethyl sulfide, which is exhaled through the lungs and released through the skin.
Can DMSO cream be used on open wounds or cuts?
No. Applying DMSO to broken skin sharply increases the risk of contaminants and other substances entering the bloodstream directly. The chemical’s skin-penetration properties mean anything on or near the wound—dirt, bacteria, medication residues—can be carried deep into tissue.
What concentration of DMSO is safe for topical use?
There is no officially established safe concentration for unregulated topical use. Medical protocols for chemotherapy extravasation use a 77% cream under supervision, while high-concentration products (90% and above) carry documented risk of severe reactions. Lower concentrations reduce but do not eliminate risk.
References & Sources
- WebMD. “DMSO (Dimethyl Sulfoxide) – Uses, Side Effects, and More.” Covers FDA approval status, side effects, and safety warnings for DMSO.
- Healthline. “What Is DMSO and How Does It Work?” Details Rimso-50® approval, administration methods, and unregulated market context.
- Health.com. “What Is DMSO and Can It Treat Pain?” Provides concentration ranges (5%–90%) and 77% protocol for chemotherapy extravasation.
- Canada.ca (Health Canada). “DMSO Fact Sheet.” Official Canadian position on approval scope, side effects, and prescription-only status.