Sulfur is a naturally occurring mineral that is found mostly near hot springs and volcanic craters. It has a distinct "rotten egg" smell, caused by sulfur dioxide gas escaping into the air. As a supplement, sulfur is available in two forms: dimethyl sulfoxide (DMSO) and methylsulfonylmethane (MSM). About 15% of DMSO breaks down into MSM in the body. Both have been touted as treatments for pain.
MSM occurs naturally in some plants, such as horsetail; fruits and vegetables; some grains; and milk. MSM is important in joint health and helps form connective tissue -- cartilage, tendons, and ligaments. It may also slow the nerve impulses that transmit pain signals, reducing pain.
DMSO is a chemical byproduct of papermaking and is used as an industrial solvent, as well as for medicine. The Food and Drug Administration has approved DMSO for intravesical use. That means it is instilled in the bladder by a doctor to treat interstitial cystitis. DMSO is also used in creams and taken by mouth for pain and other conditions. Unlike MSM, DMSO is absorbed through the skin.
Never use industrial-grade DMSO as a supplement, because it may contain dangerous impurities. You should talk to your doctor before either taking DMSO internally or applying it to your skin.
Mud baths containing sulfur, often called balneotherapy, can help treat skin disorders and arthritis. Balneotherapy is one of the oldest forms of pain relief for people with arthritis. The term "balneo" comes from the Latin word for bath and means soaking in thermal or mineral waters. Some people claim these baths are useful for allergies and respiratory problems, but there is no scientific evidence for these uses.
People also apply sulfur products to the skin to treat acne and other skin conditions.
Many -- but not all -- studies suggest there may be a connection between sulfur gases in the environment and the rise in allergy and respiratory illnesses, particularly asthma.
Sulfur baths, and other forms of sulfur applied to the skin, seem to help treat psoriasis, eczema, dandruff, folliculitis (infected hair follicles), warts, and pityriasis versicolor, a long-lasting skin disorder characterized by patches of skin that are a different color from the usual skin tone.
- Balneotherapy -- Well-designed studies, most conducted in Israel, suggest that balneotherapy can help treat several different kinds of arthritis, including osteoarthritis (OA), rheumatoid arthritis (RA), and psoriatic arthritis. People who took sulfur baths and other spa therapies improved strength, had less morning stiffness, had better walking ability, and less inflammation, swelling, and pain in joints, particularly in the neck and back. Mud packs and Dead Sea salts dissolved in a regular bath tub also improved symptoms of arthritis, but not as effectively as soaking in the Dead Sea itself.
- MSM -- MSM is a popular supplement for treating the pain of arthritis, including both OA and RA. But there is not much scientific evidence that it works. One preliminary study suggested that 6,000 mg of MSM did improve pain and function without side effects in people with OA of the knee. Some preparations combine MSM with glucosamine to treat OA. One study suggests that approach might help, but more research is needed to be sure.
- DMSO -- Several studies suggest that DMSO creams may reduce pain and swelling in people with RA and OA, but not all studies agree. Some find that DMSO is no better than placebo. More research is needed.
Allergic Rhinitis (Hay Fever)
One preliminary study showed found that taking 2,600 mg of MSM per day for 30 days reduced symptoms of seasonal allergies. But more and larger studies are needed to see whether there is any real effect.
Topical DMSO has been proposed as a treatment to relieve pain and inflammation of shingles (herpes zoster). Some evidence suggests it may reduce the number of lesions and lower inflammation, but more studies are needed.
Although research is limited, the FDA has approved DMSO to treat interstitial cystitis, a chronic bladder inflammation that causes frequent and nighttime urination, as well as pain. When DMSO is used to treat interstitial cystitis, a doctor inserts a liquid solution of DMSO directly into the bladder. General anesthesia may be needed because the procedure can be painful and may cause bladder spasms.
Several case reports suggest that DMSO, applied in creams or taken by mouth, may help treat amyloidosis, a condition where protein builds up in the body's organs and damages them. However, because the condition is rare, there are no scientific studies about DMSO and amyloidosis. Take DMSO, or apply it in creams, only with your doctor's supervision.
MSM is found in protein-rich foods such as eggs, meat, poultry, fish, and legumes. Other good sources include garlic, onions, Brussels sprouts, asparagus, kale, and wheat germ.
Sulfur supplements are available in two main forms: dimethyl sulfoxide (DMSO) and methylsulfonylmethane (MSM).
Healthy people who eat a well-balanced diet don’t usually need extra sulfur. People who follow a vegan diet, however, may be at risk for sulfur deficiency.
Ointments, creams, lotions, and dusting powders containing sulfur are available to treat skin rashes. Natural sulfur baths -- the kind usually found at hot springs -- may help ease pain associated with arthritis.
How to Take It
Don’t give sulfur to a child.
There is no recommended dietary allowance for sulfur. Most people get all they need from their diet.
- Arthritis: Studies have used a dose by mouth of 500 - 3,000 mg MSM per day; or topical doses of a cream or gel with 25% DMSO applied 1 - 3 times per day
- Hayfever: One study used 2,600 mg per day.
- Amyloidosis: Case reports have used a dose by mouth of 7 - 15 g DMSO per day; or, topical doses of 50 - 100% DMSO applied 2 times per week.
Because of the potential for side effects and interactions with medications, you should take dietary supplements only under the supervision of a knowledgeable health care provider.
Researchers believe MSM is safe. However, you should talk to your doctor before taking large doses of this or any other supplement.
Do not take DMSO internally except under your doctor's supervision. Side effects of taking DMSO internally include headache, dizziness, drowsiness, nausea and vomiting, diarrhea, or constipation. Used topically, DMSO can cause skin irritation.
If you have diabetes, asthma or liver, kidney or heart conditions, do not use DMSO. Never take industrial-grade DMSO.
DMSO should not be used by pregnant or breastfeeding women.
There are no reports to suggest that MSM interacts with any conventional medications.
However, DMSO may interact with a number of other medications. Talk to your doctor before using DMSO.
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