How to Use DMSO Safely for Topical Application

DMSO (dimethyl sulfoxide) is one of the most effective skin-penetration enhancers known, which is exactly what makes it both useful and potentially dangerous when applied topically. The same property that lets it carry therapeutic compounds through your skin barrier means it can also ferry contaminants, bacteria, or unwanted chemicals straight into your bloodstream. Using it safely comes down to understanding how it interacts with skin, keeping concentrations appropriate, and being extremely careful about what else is on your skin when you apply it.

Why DMSO Penetrates Skin So Easily

Your skin’s outermost layer, the stratum corneum, is essentially a waxy barrier made of tightly packed lipids. DMSO disrupts this barrier by wedging itself between those lipid molecules, loosening their structure and making the whole layer more fluid and permeable. Molecular simulations show that at higher concentrations, DMSO causes the lipid layers to shift from a rigid, gel-like state to a much more liquid one, which dramatically increases how easily substances pass through.¹ This is why pharmaceutical companies use DMSO as a vehicle in topical drug formulations: it can carry both water-soluble and fat-soluble medications through skin that would otherwise block them.²

This penetration ability is not subtle. DMSO moves through biological membranes readily and increases the fluidity of the lipid structures that model human skin.³ Within minutes of applying it to your skin, many people report tasting garlic or oysters in their mouth. That taste is your body metabolizing DMSO into dimethyl sulfide, a sulfur compound that gets exhaled through your lungs. It is a vivid reminder of just how quickly DMSO enters your system.

The Clean Skin Rule

Because DMSO pulls substances through your skin so efficiently, the single most important safety practice is applying it only to thoroughly clean skin. Anything sitting on your skin surface when you apply DMSO can potentially be dragged along for the ride. That includes lotions, perfumes, sunscreen, insect repellent, household chemicals, dirt, and residue from cleaning products. Wash the application area with plain soap and water, rinse well, and let it dry completely before applying DMSO.

This also means paying attention to your hands. If you handle DMSO with bare fingers that have traces of other substances on them, you risk absorbing those substances through the skin of your hands. Some people use nitrile gloves when handling DMSO, though it is worth noting that DMSO can permeate certain glove materials over time. Nitrile holds up better than latex, but no glove is a permanent barrier against DMSO if you soak it. For brief application, clean nitrile gloves work fine. For extended handling, swap them regularly.

The same logic applies to the container you store DMSO in. Use only glass or high-density polyethylene (HDPE) containers. DMSO is a powerful solvent that can dissolve or leach chemicals from certain plastics, and you do not want those dissolved chemicals ending up on your skin and then in your body.

Concentration and How Much to Use

DMSO is commercially available in concentrations ranging from about 50% to 99.9% (pharmaceutical grade). For topical use, most people dilute it with distilled water rather than applying it at full strength. Higher concentrations cause more skin irritation and are more likely to trigger the burning sensation that is the most commonly reported side effect.

A systematic review of adverse reactions found that the occurrence of side effects is clearly dose-related, and that DMSO appears safe when used in small doses.⁴ Starting with a lower concentration (around 50–70%) and working up allows you to gauge your skin’s tolerance. Some users find that 70% is a reasonable balance between penetration effectiveness and tolerability. Applying a thin layer rather than soaking the skin also helps keep the dose manageable.

One practical tip: DMSO mixed with water generates heat. When you add water to concentrated DMSO, the solution warms noticeably. This is normal and not a sign of contamination, but it means you should mix your dilution in advance and let it cool before applying it to skin.

Common Side Effects of Topical Application

Skin reactions are the most frequent issue when DMSO is applied to the skin. A systematic review that examined dozens of studies found that a local burning sensation was the most commonly reported reaction, appearing in 13 of the studies reviewed. In one study, every single participant experienced it.⁵ That same study also reported transient swelling with itching and redness in some participants. Most skin reactions were short-lived, lasting only minutes, though a few cases were severe enough to stop treatment.

A clinical trial studying DMSO applied directly to skin for managing chemotherapy drug leaks found a similar profile: burning on application, followed by itching, redness, and mild flaking. Blisters occurred in four of the patients treated.⁶ These are worth knowing about because blistering, while uncommon, signals that you should stop applying DMSO to that area.

The garlic-like body odor and taste are nearly universal at higher doses and technically count as a systemic effect, not a skin reaction. DMSO is metabolized into dimethyl sulfide, which your body excretes through your breath and sweat. There is no practical way to prevent this other than using less DMSO. The odor can persist for a day or two after application and is often the side effect that bothers people the most socially, even though it is harmless.

Dry skin at the application site is another frequently noted effect. In a trial of topical diclofenac dissolved in DMSO for knee arthritis, dry skin was the most common adverse event, affecting about 18% of participants.⁷ Applying a plain moisturizer a reasonable time after the DMSO has absorbed (at least 20–30 minutes) can help manage this.

What DMSO Carries Through Your Skin

The penetration-enhancing property of DMSO is not selective. It does not distinguish between a beneficial medication and a toxic contaminant. This is both its greatest pharmaceutical asset and the primary reason casual use demands caution.

In pharmaceutical settings, DMSO has been shown to significantly boost the skin absorption of corticosteroids, to the point where researchers suggested it could replace the more cumbersome occlusive dressing technique used to push steroids into deeper skin layers.⁸ It is also well-established as a carrier for topical NSAIDs like diclofenac.²

The practical implication is straightforward: if you intentionally mix another substance into DMSO to apply topically, you are substantially increasing that substance’s absorption. Some people do this deliberately, combining DMSO with anti-inflammatory herbs or supplements. The risk is that you can easily push too much of a substance into your system or absorb something that was never meant to enter the bloodstream at those levels. If you would not be comfortable injecting a substance, think twice about dissolving it in DMSO and putting it on your skin.

Do a Patch Test First

Before committing to applying DMSO over a large area, test a small amount on a less sensitive patch of skin, like the inner forearm. Apply a thin layer at the concentration you intend to use and wait at least 24 hours. You are watching for excessive redness, blistering, swelling, or a burning sensation that does not fade within a few minutes. A mild, brief warmth or tingle is typical and not cause for concern. Persistent pain, raised welts, or skin that stays red for hours suggests you should use a lower concentration or avoid DMSO on that area altogether.

People with sensitive skin, eczema, psoriasis, or broken skin should be especially cautious. Applying DMSO to compromised skin increases absorption dramatically and raises the chance of irritation. Open wounds, fresh cuts, and sunburned skin are all poor candidates for DMSO application.

The Eye Safety Question

One concern that circulates frequently in discussions about DMSO is whether it damages the eyes. This worry traces back to early animal studies in the 1960s, where high-dose DMSO caused lens changes in dogs and certain other species. The finding prompted significant alarm at the time. However, subsequent research in humans has not replicated this problem. A review of those early studies concluded that the lens toxicity seen in dogs “has no equivalent or counterpart in human therapy utilizing DMSO in generally accepted regimens.”⁹ More recent research into DMSO for eye diseases has found favorable outcomes with low to no observed ocular toxicity in humans.¹⁰

That said, you should still avoid getting concentrated DMSO in your eyes. The fact that it does not cause the specific lens damage seen in dogs does not mean it is comfortable or harmless as a splash to the eye. If contact occurs, flush thoroughly with water. And if you are using DMSO regularly at high concentrations over long periods, periodic eye exams are a reasonable precaution, not because there is strong evidence of risk in humans, but because the early animal data make it prudent.

Regulatory Status and What “FDA-Approved” Actually Means Here

DMSO has a complicated regulatory history. In the early 1960s, it was hailed as a potential wonder drug for everything from pain relief to inflammation. Researchers raced to study it, and the press built it into something larger than the evidence supported. The FDA eventually halted all human testing temporarily, partly because of the eye toxicity findings in animals and partly because the enthusiasm was outpacing the science.¹¹

Today, the FDA has approved DMSO for exactly one medical condition: interstitial cystitis, a chronic bladder condition, where it is instilled directly into the bladder. For topical use, DMSO is available as a pharmaceutical-grade product but is not FDA-approved for any specific topical indication in the United States. This does not mean it is illegal to buy or use. DMSO is sold as a solvent and is widely available. But it means that topical DMSO products marketed with specific health claims are operating in a gray area. If you buy DMSO for personal topical use, make sure you are getting pharmaceutical-grade or at minimum reagent-grade product, not technical or industrial grade, which may contain impurities you definitely do not want passing through your skin.

Does DMSO Itself Treat Pain or Inflammation?

This is where things get murky. DMSO has documented anti-inflammatory properties on its own, separate from its role as a carrier for other drugs.¹² Many people apply it topically to sore joints, muscle aches, and tendon injuries, reporting relief. The question is whether that relief is clinically meaningful and consistently reproducible.

A meta-analysis looking at DMSO and the related supplement MSM for knee osteoarthritis found a statistically significant reduction in pain scores compared to placebo, but the reduction was not large enough to be considered clinically meaningful. The researchers noted that a pain improvement needed to reach a certain threshold on standard pain scales to be considered a real clinical difference, and DMSO fell short of that bar.¹³ The results were also inconsistent across the included studies, which makes it harder to draw confident conclusions.

Separately, a well-designed trial comparing topical diclofenac dissolved in DMSO against a DMSO-only vehicle and a plain placebo found that the DMSO vehicle alone was no more effective than placebo for knee osteoarthritis pain.⁷ The diclofenac-plus-DMSO combination worked, but the DMSO by itself did not outperform placebo in that trial. This suggests that for osteoarthritis at least, DMSO’s main value may be as a delivery vehicle rather than a standalone treatment.

The picture is different for acute soft tissue injuries. An equine study comparing topical DMSO to MSM for tendon problems found that DMSO produced significantly better and longer-lasting improvements in lameness and pain than MSM.¹⁴ Veterinary use of topical DMSO for musculoskeletal injuries is actually more common and better established than human use, particularly in horses. Whether those results translate neatly to human joint and tendon problems is an open question, but it helps explain why DMSO has maintained a loyal following among athletes and manual laborers despite limited formal human evidence for pain relief on its own.

Practical Steps for Applying DMSO Topically

Bringing the safety considerations together into a workable routine:

Clean thoroughly: Wash the target area with plain soap and water, rinse completely, and dry. Remove any residues from other products.
Use clean hands or gloves: If using bare fingers, wash them the same way. Nitrile gloves are a good option for people who handle DMSO frequently.
Start diluted: Begin with a 50–70% solution in distilled water. You can increase concentration gradually if your skin tolerates it.
Apply a thin layer: More is not better. A thin film over the area is sufficient. DMSO does not need to pool or soak to work.
Let it absorb: Give it 15–20 minutes to dry before covering with clothing. Some people find that clothing over a freshly applied DMSO layer causes more irritation.
Avoid mixing casually: Do not add essential oils, herbal tinctures, or other substances to DMSO without understanding that you are significantly boosting their absorption and potentially changing their safety profile.
Watch for reactions: A brief tingle or warmth is normal. Persistent burning, redness that lasts more than an hour, blistering, or swelling means stop and wash the area.

Who Should Avoid Topical DMSO

Pregnant or breastfeeding women should avoid DMSO. The substance crosses biological membranes so readily that systemic exposure is essentially guaranteed, and there is not enough safety data for these populations. People taking blood thinners should also be cautious, since DMSO may increase the absorption of other topical medications and has some antiplatelet activity of its own.

If you have liver or kidney disease, the additional metabolic burden of processing DMSO and its metabolites may be a concern, particularly with frequent or high-dose use. A systematic review confirmed that adverse reactions overall tend to be mild and transient, and that cardiovascular and respiratory reactions are more associated with intravenous rather than topical administration.¹⁵ Topical use at reasonable concentrations is the lowest-risk route. But “low risk” is not “no risk,” and individual tolerance varies.

Children’s skin is thinner and more permeable than adult skin, making DMSO absorption faster and less predictable. There is very little pediatric safety data for topical DMSO, and it is best avoided in children unless directed by a physician.

Sourcing and Purity

Not all DMSO sold commercially is appropriate for skin contact. Industrial-grade DMSO may contain residual impurities from the manufacturing process, and given that DMSO will pull those impurities through your skin, purity matters more here than with almost any other topical substance. Look for pharmaceutical-grade or USP-grade DMSO, which indicates the product meets standards for use in medical or pharmaceutical applications. Reagent-grade (ACS grade) is also acceptable, as it is manufactured to high purity for laboratory use.

Pure DMSO at room temperature should be a clear, colorless liquid with a faintly sweet, garlic-like smell. It freezes at around 19°C (66°F), so if your bottle solidifies in a cool room, that is actually a good sign of purity, not a defect. Simply warm it gently to re-liquefy. If DMSO has a strong chemical odor, is yellowish, or comes in a non-standard container, treat it with suspicion. The cost difference between industrial and pharmaceutical grade is modest, and the safety implications of using a purer product are real. When a substance’s entire purpose is to push things through your skin barrier, the last thing you want in it is an unknown contaminant.

1
PubMed Central. The permeability enhancing mechanism of DMSO in ceramide bilayers simulated by molecular dynamics
2
PubMed. Dimethyl sulfoxide: an effective penetration enhancer for topical administration of NSAIDs
3
PubMed. The role of dimethyl sulfoxide (DMSO) in ex-vivo examination of human skin burn injury treatment
4
PubMed Central. Adverse reactions of dimethyl sulfoxide in humans: a systematic review – Section: Results
5
PubMed Central. Adverse reactions of dimethyl sulfoxide in humans: a systematic review – Section: Dermatological reactions
6
PubMed. A prospective study of topical dimethyl sulfoxide for treating anthracycline extravasation
7
PubMed. Efficacy and safety of topical diclofenac containing dimethyl sulfoxide (DMSO) compared with those of topical placebo, DMSO vehicle and oral diclofenac for knee osteoarthritis
8
JAMA Dermatology. Dimethyl Sulfoxide as a Vehicle for Corticosteroids: A Comparison With the Occlusive Dressing Technique
9
JAMA Ophthalmology. The Effect of Dimethyl Sulfoxide (DMSO) on Animal and Human Eyes
10
PubMed. Application of Dimethyl Sulfoxide as a Therapeutic Agent and Drug Vehicle for Eye Diseases
11
Oxford Academic. An Incipient “Wonder Drug” Movement: DMSO and the Food and Drug Administration
12
PubMed Central. Dimethyl sulfoxide: history, chemistry, and clinical utility in dermatology
13
PubMed Central. Meta-Analysis of the Related Nutritional Supplements Dimethyl Sulfoxide and Methylsulfonylmethane in the Treatment of Osteoarthritis of the Knee
14
Iraqi Journal of Veterinary Sciences. The role of DMSO and MSM in treatment of tendinopathies affection in equine: A comparative study
15
PubMed Central. Adverse reactions of dimethyl sulfoxide in humans: a systematic review – Section: Discussion