Ingredient guide
MSM is a sulphur compound used for joint and muscle comfort. Early human trials suggest modest help with joint pain and recovery, but the evidence is limited and not yet definitive. It has a good safety record.
Limited evidenceMSM, short for methylsulfonylmethane, is a sulphur-containing compound found naturally in small amounts in plants, animals, and people. Supplements use a synthetic form that is chemically identical. It is most often sold for joints, sometimes alongside glucosamine and chondroitin.
MSM supplies sulphur, which the body uses to build and maintain connective tissues. It also shows antioxidant activity and may influence the body's normal recovery processes. These mechanisms are plausible, but as always the question is whether they add up to a benefit you would notice.
The early human evidence is cautiously encouraging. Several small trials report that MSM improves joint pain and physical function in people with joint degeneration, and some studies suggest it eases muscle soreness after exercise. A controlled trial in people with mild knee pain reported better knee quality of life.
The honest limit is that reviews conclude there is not yet definitive evidence, and the best dose and duration are still being worked out. We grade the evidence as limited. MSM has a strong safety record and a reasonable rationale, so a trial is low risk, but it is not a proven fix.
Studies most often use 1.5 g to 3 g per day, well within the amount considered likely safe. If you try it for joints or recovery, give it several weeks and choose a tested product. Because human evidence is still limited, keep it as one part of a wider plan and check with your healthcare provider if you take medication.
Trials have used 500 mg up to 6 g per day, commonly around 1.5 g to 3 g, for several weeks. MSM is rated as likely safe up to about 4 g per day for up to 12 weeks. There is no official dose. Ask your healthcare provider before regular use if you take medication.
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Studies use 500 mg up to 6 g per day, commonly 1.5 to 3 g. Amounts up to about 4 g per day for up to 12 weeks are considered likely safe.
It has a good safety record. Side effects are mild and appear about as often with placebo in trials. Check with a provider if you take medication or are pregnant.
MSM is often combined with glucosamine and chondroitin, but it is not clear whether it adds much on top of them. The evidence is limited.