MSM · Methylsulfonylmethane
Sulfur compound for joints. Small trials show modest pain relief; effects are real but limited in size.
Short answer
Modest but consistent for joint discomfort. Doses under 3 g/day are below what the trials used.
Product and dose overview
MSM (Methylsulfonylmethane) is a skin / joint with evidence grade C, meaning it is backed by mixed or small human trials. We track 0 products containing MSM. The top-ranked product scores 0 out of 10 on our composite scale (dose, evidence, price, testing, transparency). Prices range up to $0.00 per month.
What it is
An organic sulfur compound found in small amounts in food. Sold mostly for joint pain and exercise recovery.
Why people take it
Several small randomized trials show MSM reduces knee osteoarthritis pain a bit more than placebo, at 3 to 6 grams per day. The trials are small and short, so confidence is limited, but the direction is consistent.
Our verdict
Modest but consistent for joint discomfort. Doses under 3 g/day are below what the trials used.
Structure & class
Dimethyl sulfone, oxidation product of DMSO. Proposed mechanism: sulfur donation and NF-κB/IL-6 modulation.
Mechanism & clinical data
Kim et al. 2006 (Osteoarthritis Cartilage) RCT (n=50) found 3 g twice daily reduced WOMAC pain vs placebo over 12 weeks. NotaKoshi et al. 2023 RCT confirmed improvement in knee-related quality of life in healthy participants with mild symptoms. Trials are small, industry funding is common, and long-term data is absent.
Pharmacokinetics
Absorbed within hours; steady-state reached in days.
Dose & forms
What to watch out for
Many combination products underdose MSM at 500-1000 mg — well below trial doses. Purity testing matters; cheap MSM is a commodity chemical.
Where this dose comes from
The trial dose above is our editorial pick from the published human trials for this ingredient. We choose the dose that the best-available studies used on the endpoint most relevant to longevity. The range shows the lowest and highest doses tested in published trials. The landmark studies below are the papers we read to set it. You can click through and check our work.
When new trials publish, our automated sweeps flag them. If a new study materially changes the dose, we update it through editorial review and record the old dose, new dose, and the triggering study in every affected product's recommendation history. The dose is never changed automatically.
Regulatory status
Timeline
Regulatory events, evidence grade changes, and key research milestones for MSM, most recent first. Studies link to the paper; regulatory entries name and link the responsible authority.
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EU Court sharpens the bar for botanical health claimsA Court of Justice of the European Union ruling in April 2025 further tightened the requirements for how botanical ingredients (herbs, plant extracts) can be marketed with health claims in the EU, effectively removing much of the flexibility of the on-hold list.
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EU report identifies 117 supplement substances as potential health risksThe HoA Working Group on Food Supplements (26 European countries) published its first report evaluating 117 substances used in food supplements. Of these, 65 were assessed as likely novel foods, 6 were already regulated, 34 had insufficient data, and 12 were prioritized for Article 8 restriction under Regulation (EC) No 1925/2006. The 12 priority substances include ashwagandha, curcumin, melatonin, piperine, St. John's wort, coumarin, p-synephrine, maca, holy basil, Melaleuca, black cohosh, and L-tryptophan. The report drew on 1,500 RASFF alerts reviewed between 2017 and mid-2022.
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RCT 2023 (knee QoL)Randomized trial in adults with mild knee discomfort: MSM improved knee-related quality of life scores vs placebo.
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EU Health Claims Regulation adoptedRegulation (EC) No 1924/2006 laid down harmonised rules for nutrition and health claims made on foods, including supplements. Only claims listed in the EU Register of authorised claims can be used. Rejected botanical claims are held in a separate on-hold list.
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Kim et al. 2006 (Osteoarthritis Cartilage)Pilot RCT (n=50): MSM 6 g/day improved knee OA pain and function vs placebo over 12 weeks.
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EU introduces the Novel Food RegulationRegulation (EC) No 258/97 required any food or food ingredient without a history of consumption in the EU before 15 May 1997 to be authorised before being placed on the market. This is the framework that captures NMN, spermidine as a supplement ingredient, urolithin A, and many other longevity actives.
Landmark studies
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Kim et al. 2006 (Osteoarthritis Cartilage)
Pilot RCT (n=50): MSM 6 g/day improved knee OA pain and function vs placebo over 12 weeks.
Read study → -
RCT 2023 (knee QoL)
Randomized trial in adults with mild knee discomfort: MSM improved knee-related quality of life scores vs placebo.
Read study →
Found in these products
All products in our catalog that contain MSM, ranked by our overall score. Ranking is editorial, never paid.
No products in our catalog contain this yet.
Buying guides and comparisons
Related ingredients
See all in Skin / Joint →Molecules in the same class, plus the actives most often formulated alongside MSM in our catalogue.
See MSM in context: the mechanism it acts through, the biomarker it moves, the products that dose it, and the trials that tested it.
View MSM on the Longevity Map →Frequently asked questions
What is MSM?
An organic sulfur compound found in small amounts in food. Sold mostly for joint pain and exercise recovery.
What dose of MSM should I take?
The trial dose in published human studies is 3000 mg per day, with a range of 1500 to 6000 mg per day. Always consult a qualified clinician before starting any supplement.
Is MSM safe?
Many combination products underdose MSM at 500-1000 mg — well below trial doses. Purity testing matters; cheap MSM is a commodity chemical.
What is the best MSM supplement?
We track 0 products containing MSM. The top-ranked product scores 0 out of 10 on our composite scale, which evaluates dose, evidence, price, third-party testing, and transparency. See the comparison table above. Scores are editorial judgments, not a scientific standard.
What is the evidence grade for MSM?
MSM has evidence grade C, meaning it is backed by mixed or small human trials. Grade A means replicated human RCTs with hard endpoints. Grade B means human RCTs with biomarker outcomes. Grade C means mixed or small human trials. See our evidence grading methodology.
Data verification
Evidence grades are reviewed when new human RCTs are published. Product counts update automatically as new products are added. Dose ranges reflect published trial data, not brand recommendations. Read how we verify.