Is DMSO in pain products safe? What the FDA labels say

DMSO (dimethyl sulfoxide) is a real pharmaceutical ingredient, but "is it safe?" has no one-word answer. The FDA-approved DMSO product is a 50% solution placed in the bladder by a clinician for interstitial cystitis, and its label states it has not been approved as safe and effective for any other use. Pain drops and roll-ons that contain DMSO are different products, usually without a stated concentration.

This guide explains what the official labels say about DMSO, where the best topical evidence comes from, and how to read a DMSO pain product on a sales page. It is general information, not medical advice. A doctor or pharmacist can tell you whether a product fits your situation and your medicines.

What is DMSO and what is it approved for?

DMSO is a clear, nearly odorless solvent that mixes with water and with most oils. In medicine it has two documented roles that we could confirm on official drug labels.

The first is the bladder drug RIMSO-50, a 50% w/w solution of DMSO in water. Its FDA-reviewed label says it is given by instillation into the bladder for the symptomatic relief of interstitial cystitis, and adds that it "has not been approved as being safe and effective for any other indication."

The second is as an inactive ingredient in a prescription drug. PENNSAID, a diclofenac sodium topical solution for osteoarthritis of the knee, contains 1.5% diclofenac and 45.5% w/w DMSO as the solvent in the formula. The label's dosing is 40 drops per painful knee, four times a day. The active pain medicine in that product is diclofenac, an NSAID, and DMSO is part of the delivery vehicle.

That second point is the one most sales pages blur. The research history behind "DMSO" on a pain-drop sales page usually refers to DMSO helping another drug pass through skin, not to DMSO acting as a standalone pain reliever.

What do the official labels say about DMSO safety?

The RIMSO-50 label is the clearest official description of DMSO's behavior in the body. Its points include:

• Absorption through skin: after topical application, DMSO is absorbed and distributed through tissues and body fluids.
• Allergic-type reactions: DMSO can trigger histamine release, and the label mentions occasional hypersensitivity reactions with topical use.
• Garlic-like taste and odor: metabolites leave through the breath and skin, and an odor can last up to 72 hours.
• Eye findings in animals: lens changes were seen in monkeys, dogs and rabbits given high doses over long periods, so the label recommends eye exams during treatment.
• Medicine interactions: the patient information says some data indicate DMSO could change the effectiveness of medicines a person is already taking, and tells patients to name all their medicines to the physician.
• Monitoring: patients on the bladder drug are advised to have liver and kidney tests and a blood count about every six months.

Those instructions were written for a supervised bladder treatment at a stated 50% strength, not for a bottle of drops. They do show what the manufacturer and regulators consider worth watching. The same label tells readers that DMSO crosses into the body, which matters for anyone applying it to skin daily.

The PENNSAID label adds skin data from its trials: dry skin in 32% of users, contact dermatitis with redness and hardening in 9%, and contact dermatitis with blisters in 2%. Those rates describe a drug that contains DMSO plus diclofenac, so they cannot be pinned on DMSO alone, but they show that DMSO-based liquids can irritate skin. The label also carries a boxed warning about cardiovascular and gastrointestinal risk. That warning is about diclofenac, the NSAID, and is relevant mainly because it shows that effects people attribute to "DMSO" often come from a drug dissolved in it.

Is there evidence that DMSO itself relieves pain?

The evidence we opened is thin and mostly about DMSO in a mixture. A 2011 review abstract in The Physician and Sportsmedicine describes DMSO as a well-established penetration enhancer in topical drug products, including diclofenac solution. That supports the delivery role.

The most direct trial we found tested a mixture. In a 2024 Scientific Reports trial of 62 people with plantar fasciitis (heel pain), a solution of plant terpenes (camphor, menthol, eugenol, eucalyptol and vanillin) in 15% DMSO, with limonene and rosemary oil, was applied twice a day. By day 10, 78.1% of treated patients reported an 85% or greater drop in their foot pain score, and the placebo had no effect. The study cannot show what DMSO contributed, because the active mix also contained menthol and camphor. One author has been a paid consultant to natural product companies, which the paper discloses.

Two details matter for shoppers. First, the DMSO in that trial was 15% of a defined formula, and the formula was published. Second, the result is for plantar fasciitis in one trial of 62 people, not for pain in general.

How do DMSO pain products on sales pages compare?

We have reviewed two offers that contain DMSO, and the reviews show the range. We repeat what each review found.

The Arctic Blast review covers a DMSO-based drop blended with camphor, menthol, aloe vera, arnica, emu oil and wintergreen oil. The review notes that none of the six active ingredients lists a concentration, that no trial of the finished product is cited, and that the page leans on 1960s anecdotes. It also checks the claim "DMSO is FDA approved" and calls it true but incomplete, because the approval is for the bladder solution. The review adds that the garlic-like taste and odor DMSO can cause is not mentioned on the sales page. On the plus side, the offer has a 365-day refund.

The Roll On Relief review shows the opposite problem. Its label is unusually specific: camphor 80 mg, menthol 50 mg and peppermint oil 30 mg per serving. DMSO is listed at 1 mg per serving in an 88 mL bottle, and the review points out that studies of DMSO as a penetration enhancer use gel concentrations of roughly 10% to 90%. At 1 mg, DMSO is a trace ingredient, so the label is mostly an ordinary camphor and menthol rub. The refund requires mailing back every bottle, and shipping costs are deducted.

For comparison, products that rely on ordinary counterirritants do not carry the DMSO questions at all. The Insta Soothe review describes a menthol, arnica and aloe cream, and the Balmorex Pro review a topical with a fully disclosed ingredient list and a named manufacturer. Neither lists DMSO. For more topical and joint offers, see the joints and mobility category.

What should you ask before using a DMSO product?

1. What is the DMSO concentration? The only stated numbers we found are 50% (the bladder drug), 45.5% (PENNSAID) and 15% (the heel pain trial). A blank on the label is a reason to hesitate.
2. Does the product contain a second active ingredient that DMSO carries along? If so, its risks matter too.
3. Do you take prescription medicines? The RIMSO-50 label raises the possibility of changed medicine effects, so show the label to a pharmacist before you start.
4. Do you have skin allergies or damaged skin where you plan to apply it? The label mentions hypersensitivity and histamine release.
5. Are you pregnant, nursing, or buying for a child? NCCIH notes that many dietary supplements have not been tested in these groups, and the RIMSO-50 label says safety in children has not been established.
6. Does the sales page mention the garlic-like odor and side effects, or only benefits? A page that lists only benefits tells you something about its transparency, which is one of the things our review method scores.
7. What are the refund terms? See our ClickBank refund guide before ordering.

FAQ

Is DMSO approved by the FDA for pain?

Not as a standalone pain treatment. The FDA-reviewed RIMSO-50 label covers bladder instillation for interstitial cystitis and says it is not approved for any other indication. DMSO also appears as an inactive solvent in PENNSAID, whose active drug is diclofenac.

Why does DMSO cause a garlic smell?

The body converts DMSO into dimethyl sulfide, which leaves through the breath and skin. The RIMSO-50 label describes a garlic-like taste and an odor that can last up to 72 hours.

Can DMSO interact with other medicines?

The RIMSO-50 patient information says some data indicate DMSO could change the effectiveness of medicines a person already takes. Tell your doctor or pharmacist about every product you use, including topical ones.

Does a tiny amount of DMSO do anything in a roll-on?

We found no trial of DMSO at trace levels. The studies we opened used DMSO at 15% to 50% of a formula, while the Roll On Relief label lists 1 mg in an 88 mL bottle, so the label alone gives no reason to expect the effects of those studies.