Learn About DMSO Before Using It

What DMSO Is and How It Works

Dimethyl sulfoxide, commonly known as DMSO, is a chemical compound derived from wood pulp during the paper manufacturing process. The substance has a distinctive garlicky odor and appears as a clear, colorless liquid at room temperature. DMSO became known in the medical and scientific communities during the 1960s when researchers began studying its properties and potential uses in medical settings.

The chemical structure of DMSO allows it to penetrate skin tissue relatively easily compared to many other substances. This penetration ability is one reason researchers have investigated DMSO for various medical applications. When DMSO enters the body, it travels through the bloodstream and distributes to different tissues. The body metabolizes DMSO into dimethyl sulfide, which is then excreted through urine and breath—which explains the characteristic garlic-like smell people experience after using DMSO.

DMSO has several properties that make it interesting to researchers. It acts as a solvent, meaning other substances dissolve in it. It also has anti-inflammatory and antioxidant properties in laboratory settings. These characteristics have led scientists to study DMSO for different health conditions, though research results vary considerably depending on the condition being studied and how DMSO is being used.

The FDA has approved DMSO for one specific medical use: treating interstitial cystitis, a chronic bladder condition. In this approved form, DMSO is administered directly into the bladder by a healthcare provider. This approval does not extend to other uses or forms of DMSO, and it does not mean DMSO is safe or effective for conditions beyond this specific application.

Practical Takeaway: Understanding what DMSO actually is—a wood pulp byproduct with certain chemical properties—provides context for why people have investigated it for medical purposes. However, approval for one specific bladder treatment does not translate to safety or effectiveness for other uses.

FDA Approval Status and Regulatory Oversight

The Food and Drug Administration (FDA) regulates DMSO as a drug in the United States. This regulatory classification means DMSO cannot be marketed or sold for medical purposes unless it meets specific FDA requirements. Currently, the only FDA-approved medical use of DMSO is for interstitial cystitis treatment, administered as an instillation directly into the bladder. This approval came after the FDA reviewed scientific evidence about DMSO's safety and effectiveness for this particular condition.

For interstitial cystitis, DMSO is sold under the brand name Rimso-50. This preparation is a sterile solution containing 50% DMSO in water, and it must be administered by a healthcare provider in a clinical setting. The FDA's approval for this specific use does not extend to other medical conditions or to over-the-counter use. People cannot legally purchase DMSO as an unapproved drug for other health conditions in the United States.

Despite the limited FDA approval, DMSO is available through other channels. Some people obtain DMSO marketed as a "solvent" or "research chemical" from suppliers who do not market it for human consumption. This practice exists in a legal gray area. The FDA has stated that selling unapproved drugs is illegal, but enforcement varies. People who purchase DMSO outside the approved medical context do so without FDA oversight of purity, strength, or sterility.

Many other countries have different regulatory approaches to DMSO. Some nations permit DMSO to be sold for certain medical uses, while others maintain strict restrictions similar to the United States. The lack of consistent international regulation means that DMSO obtained from international sources may not meet any particular safety or purity standards.

Practical Takeaway: DMSO has very limited FDA approval—only for bladder instillation in interstitial cystitis. Any other use of DMSO is unapproved by the FDA. Understanding this regulatory status is important before considering DMSO use, as unapproved products lack the safety oversight that comes with FDA approval.

What Research Shows About DMSO Effectiveness

Scientific research on DMSO has examined its potential for various conditions, with results that range from promising to inconclusive to negative. The most established research supports DMSO's use for interstitial cystitis—the condition for which it has FDA approval. Studies examining DMSO bladder instillation for this condition have shown symptom improvement in some patients, though not all individuals respond equally to treatment.

Research has also explored DMSO for other conditions, including arthritis, sports injuries, joint pain, and certain skin conditions. Some older studies from the 1970s and 1980s suggested potential benefits, but many of these studies had methodological limitations. More recent, well-designed studies have produced mixed or disappointing results. For example, research on DMSO for osteoarthritis has not consistently shown it to be more effective than placebo treatments. Studies examining DMSO for acute injuries have similarly produced inconclusive findings.

DMSO's anti-inflammatory properties in laboratory settings have generated interest from researchers, but laboratory results do not always translate to effectiveness in living humans. The human body is far more complex than a test tube or petri dish, and a substance that shows anti-inflammatory effects in a laboratory may not produce the same effects when taken internally or applied to skin. This disconnect between laboratory and clinical results is common in medical research.

One challenge in DMSO research is the "placebo effect." When people receive DMSO, they often notice the distinctive garlic smell, which signals to them that something is happening. This sensory experience can influence how they perceive their symptoms. In studies where researchers give some people DMSO and others a placebo while masking which is which, the differences between DMSO and placebo become less clear. This suggests that some reported benefits may relate to expectations rather than DMSO's direct effects.

Many claims about DMSO circulate online and in alternative health communities, but these claims often lack scientific support. For conditions like cancer, arthritis, or Alzheimer's disease, claims about DMSO effectiveness are not backed by high-quality research evidence. People considering DMSO should be aware that popular claims about its benefits often exceed what research actually demonstrates.

Practical Takeaway: While research supports DMSO for interstitial cystitis, evidence for other uses is weak or mixed. Many popular claims about DMSO lack scientific backing. Understanding what research actually shows, versus what people claim, is essential for making informed decisions.

Safety Concerns and Potential Side Effects

DMSO can cause several side effects, with the most common being local reactions at the application site or systemic effects from absorption. The characteristic garlic odor that appears on the breath and in sweat after DMSO use is almost universal but is not dangerous—it is simply a sign that DMSO has been absorbed and metabolized. However, this side effect bothers some people enough to avoid using DMSO.

When applied to skin, DMSO can cause local irritation, burning, redness, or itching. These reactions may be mild or pronounced depending on the individual and the concentration of DMSO used. Some people develop contact dermatitis or other skin reactions. When DMSO is applied topically, it increases skin permeability, which means it carries other substances through the skin more easily. This property creates both potential benefits and risks, as DMSO may carry contaminants or unwanted substances through the skin barrier.

DMSO can cause headaches, dizziness, or nausea in some people. These systemic side effects may occur even with topical application because DMSO is absorbed through the skin. Some people report disturbances in vision or eye irritation. If DMSO comes into contact with the eyes, it can cause discomfort or temporary vision changes. These effects are generally reversible when exposure stops, but they indicate that DMSO has significant biological activity.

Certain populations should be particularly cautious about DMSO use. Pregnant women should avoid DMSO because safety in pregnancy has not been established, and animal studies have raised concerns about potential developmental effects. People with bleeding disorders or those taking blood thinners should be cautious, as DMSO may increase bleeding risk. People with kidney or liver disease may have difficulty metabolizing DMSO safely. Those with diabetes should note that DMSO may affect blood sugar levels.

When DMSO is obtained from non-pharmaceutical sources—such as industrial suppliers or online retailers not marketing it as a medical product—it may contain impurities or contaminants.