NutriDex

The Supplement Research Compendium
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MSM (Methylsulfonylmethane)

Sulfur compound taken for joint pain, with small, inconsistent effects.

Mixed evidence ✨Joint & Skin

✚ Updated · How we grade evidence

Evidence tier
Mixed
Research weight
Citations
9 verified / 9
Classification
Joint & Skin
❝
What the evidence says. Graded mixed: individual short RCTs report small reductions in osteoarthritis pain and function, but a pooled meta-analysis of high-quality trials found a non-significant pain effect, so any real benefit is at best modest and unproven. (Mixed evidence: Conflicting results across studies; benefit uncertain.)

What is MSM (Methylsulfonylmethane)?

MSM (Methylsulfonylmethane) is a joint and skin supplement used for ease knee osteoarthritis pain. NutriDex grades the human evidence as Mixed. MSM is an organic sulfur compound (dimethyl sulfone) sold mainly for joint pain. In knee osteoarthritis, two 12-week placebo-controlled RCTs found statistically significant but small improvements in WOMAC pain and physical function at 3–6 g/day, and a 2023 trial at 2 g/day improved a Japanese knee-OA score (8.1 vs 10.9 points). However, a 2009 meta-analysis of three good-quality trials (326 patients) found only a non-significant 6.3 mm reduction in pain on a visual analogue scale, concluding MSM and DMSO are not clinically effective. In exercise studies, MSM blunted post-run muscle and joint soreness but did not lower oxidative-stress or muscle-damage markers. One open-label trial suggested relief of seasonal allergic-rhinitis symptoms, but it had no placebo group. Overall the effects are inconsistent and likely minor; MSM is well tolerated but not a proven treatment.

Purported Benefits

✓Ease knee osteoarthritis pain
✓Improve physical function
✓Reduce post-exercise muscle soreness
✓Possible allergy symptom relief

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Ease knee osteoarthritis painIndividual RCTs show small WOMAC/JKOM gains, but a meta-analysis of 3 trials found a non-significant 6.3mm VAS drop. Mixed ↔ mixed · small 3
Improve physical functionTwo 12-week knee-OA RCTs improved function vs placebo, but effects were small and trials short. Preliminary ↑ benefit · small 2
Reduce post-exercise sorenessOne small half-marathon RCT blunted muscle/joint pain but did not change muscle-damage or oxidative markers. Preliminary ↑ benefit · small 1
Relieve allergic rhinitisSingle open-label trial reported symptom relief, but had no placebo control, limiting interpretation. Preliminary ↑ benefit 1

Dosing & Compounds

Typical Dose
Most trials use 1.5–6 g/day (commonly 3 g once or twice daily) of oral MSM for 12 weeks.
Active Compounds
Methylsulfonylmethane (dimethyl sulfone)Bioavailable organic sulfur

Safety & Cautions

MSM is generally well tolerated; the most common side effects are mild gastrointestinal upset, nausea, bloating, headache and insomnia, mostly at higher doses. It is FDA GRAS-listed and human trials up to ~4–6 g/day show few adverse events, but long-term safety data are limited and it should be avoided in pregnancy and breastfeeding due to lack of study. No well-documented drug interactions exist, though it is theoretically prudent to use caution alongside anticoagulants; tell your clinician before combining it with other medications. Educational only — always check with your doctor or pharmacist before combining MSM (Methylsulfonylmethane) with any medicine.

Key Studies

Meta-analysis Brien 2011 ✓ PubMed
Meta-analysis of 3 RCTs (326 patients): non-significant pain reduction of 6.34 mm on VAS; concluded MSM/DMSO not clinically effective for OA.
Systematic review Brien 2008 ✓ Full text
Systematic review: both MSM trials showed significant pain improvement, but positive trends were not definitive for mild-to-moderate knee OA.
RCT Toguchi 2023 ✓ PubMed
RCT (n=80, mild knee pain): MSM 2 g/day for 12 weeks lowered JKOM knee score vs placebo (8.1 vs 10.9 points, p=0.046).
RCT Withee 2017 ✓ PubMed
RCT (n=22, half-marathon): MSM 3 g/day attenuated post-exercise muscle and joint pain but did not reduce oxidative-stress or muscle-damage markers.
RCT Debbi 2011 ✓ PubMed
RCT (n=49, knee OA): MSM 1.125 g three times daily for 12 weeks improved pain and function vs placebo, but improvements were small.
RCT Kim 2006 ✓ PubMed
RCT (n=50, knee OA): MSM 3 g twice daily for 12 weeks significantly cut WOMAC pain and physical-function scores vs placebo; no change in stiffness.
RCT Barrager 2002 ✓ PubMed
Open-label trial (n=50): 2.6 g/day MSM for 30 days reduced seasonal allergic-rhinitis symptoms, but no placebo control limits interpretation.
Review Ganbaatar 2026 ✓ PubMed
Inclusion of Lesbian, Gay, Bisexual, Transgender, Queer, and Intersex Populations in Mongolian Health Policy: A Scoping Review and Critical Discourse Analysis
Review Butawan 2017 ✓ PubMed
Review: MSM is GRAS and generally well tolerated up to ~4 g/day, with mild GI side effects; benefits for pain and inflammation remain modest.
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about MSM (Methylsulfonylmethane)

What is MSM (Methylsulfonylmethane) used for?

MSM (Methylsulfonylmethane) is most often taken for Ease knee osteoarthritis pain, Improve physical function, Reduce post-exercise muscle soreness, Possible allergy symptom relief. Sulfur compound taken for joint pain, with small, inconsistent effects.

Does MSM (Methylsulfonylmethane) work — what does the evidence say?

Mixed evidence. Conflicting results across studies; benefit uncertain. MSM is an organic sulfur compound (dimethyl sulfone) sold mainly for joint pain. In knee osteoarthritis, two 12-week placebo-controlled RCTs found statistically significant but small improvements in WOMAC pain and physical function at 3–6 g/day, and a 2023 trial at 2 g/day improved a Japanese knee-OA score (8.1 vs 10.9 points). However, a 2009 meta-analysis of three good-quality trials (326 patients) found only a non-significant 6.3 mm reduction in pain on a visual analogue scale, concluding MSM and DMSO are not clinically effective. In exercise studies, MSM blunted post-run muscle and joint soreness but did not lower oxidative-stress or muscle-damage markers. One open-label trial suggested relief of seasonal allergic-rhinitis symptoms, but it had no placebo group. Overall the effects are inconsistent and likely minor; MSM is well tolerated but not a proven treatment.

What is the typical dose of MSM (Methylsulfonylmethane)?

Most trials use 1.5–6 g/day (commonly 3 g once or twice daily) of oral MSM for 12 weeks.

Is MSM (Methylsulfonylmethane) safe? Any cautions or side effects?

MSM is generally well tolerated; the most common side effects are mild gastrointestinal upset, nausea, bloating, headache and insomnia, mostly at higher doses. It is FDA GRAS-listed and human trials up to ~4–6 g/day show few adverse events, but long-term safety data are limited and it should be avoided in pregnancy and breastfeeding due to lack of study. No well-documented drug interactions exist, though it is theoretically prudent to use caution alongside anticoagulants; tell your clinician before combining it with other medications.

How many studies support MSM (Methylsulfonylmethane)?

NutriDex cites 9 sources for MSM (Methylsulfonylmethane), graded "Mixed".

Cite this page
APA

Peh, D. (2026). MSM (Methylsulfonylmethane): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 10 Aug 2026, from https://nutridex.info/s/msm

BibTeX
@misc{nutridex_msm,
  author       = {Peh, Daryl},
  title        = {MSM (Methylsulfonylmethane): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/msm},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-08-10}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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