Dr. Rachel StoneMSM (methylsulfonylmethane) is an organic sulphur compound found naturally in small amounts in green vegetables, fruits, and grains. As a supplement, it has been studied primarily for joint pain, inflammation, and skin health. The evidence is modest but genuine — particularly for osteoarthritis — making it one of the more legitimate natural joint supplements available.
What Is MSM?
Methylsulfonylmethane is a sulphur-containing compound that occurs naturally in many foods and is also produced endogenously in small amounts. Sulphur is the third most abundant mineral in the human body — essential for collagen synthesis, glutathione production, and connective tissue integrity. MSM supplements provide a bioavailable organic sulphur source that may support these sulphur-dependent processes. It is well-tolerated, water-soluble, and has been studied in numerous clinical trials, primarily at doses of 1.5–3g daily.
MSM Benefits
1. Joint Pain and Osteoarthritis — Best Evidence
This is MSM’s most consistently supported benefit. Multiple randomised controlled trials show MSM significantly reduces pain, stiffness, and swelling in osteoarthritis — particularly knee osteoarthritis. UCLA Health confirms MSM can ease arthritis pain. A PMC review (PMC5372953) of multiple studies found significant improvements in pain and physical function scores compared to placebo. The Arthritis Foundation UK specifically lists MSM as showing evidence for joint pain reduction. Studies typically use 1.5–3g daily for 12 weeks, with benefits appearing within 4–6 weeks. The mechanism involves sulphur provision for cartilage matrix proteins and reduction of inflammatory signalling through NF-κB inhibition.
2. Anti-Inflammatory Effects
MSM reduces several markers of inflammation. It inhibits NF-κB activation — a master inflammatory transcription factor — and reduces pro-inflammatory cytokines including TNF-α and IL-6. A PMC review (PMC10346176) confirmed anti-inflammatory activity across multiple human and animal studies. It also reduces exercise-induced oxidative stress, making it potentially useful for recovery from intense training. The anti-inflammatory effects are most clinically meaningful in the context of joint disease — whether they translate to meaningful benefits for systemic inflammation in healthy people is less established.
3. Skin Health
One clinical study found oral MSM significantly improved visual signs of skin ageing — reducing wrinkle depth, skin firmness, and skin tone — in a controlled trial. The mechanism is plausible: MSM provides sulphur required for collagen and keratin synthesis, which are the structural proteins of skin. A Hogrefe journal study (2021) confirmed these findings with a standardised MSM preparation. This is limited but genuine evidence — one well-designed trial — rather than the zero evidence that characterises many supplement skin claims. UCLA Health and WebMD both note the skin evidence as early but promising.
4. Exercise Recovery
MSM reduces exercise-induced muscle damage and oxidative stress. Studies show it reduces delayed onset muscle soreness (DOMS) after intense exercise. A clinical trial found MSM supplementation significantly reduced muscle soreness and fatigue recovery time compared to placebo. The mechanism involves both its antioxidant properties (supporting glutathione production) and anti-inflammatory effects that reduce exercise-induced inflammatory cascades.
5. Hair and Nails — Weak Evidence
MSM is commonly marketed for hair growth, but human evidence is not strong. The theoretical basis is sound — sulphur is required for keratin synthesis and cysteine production (keratin is high in cysteine, a sulphur-containing amino acid). Mouse studies show increased hair growth. However, no large RCTs confirm meaningful hair growth in humans. WebMD notes this as an area needing more human research before conclusions can be drawn.
How to Take MSM
- Dose: 1.5–3g daily — most clinical trials use this range
- Timing: With meals to reduce any GI discomfort; can be split into 2 doses (morning and evening)
- Duration: Benefits for joint pain appear within 4–6 weeks; continue for at least 12 weeks to assess full effect
- Forms: Capsules or powder — both equally effective; powder can be mixed into water or smoothies
- Stacking: Often combined with glucosamine and chondroitin for joint support; the combination has more evidence than any component alone
Frequently Asked Questions
MSM has the strongest evidence for osteoarthritis joint pain — multiple RCTs show significant reduction in pain, stiffness, and swelling at 1.5–3g daily. It also has good evidence for reducing exercise-induced muscle soreness, early evidence for skin anti-ageing effects, and anti-inflammatory properties. Hair growth claims have biological plausibility but limited human evidence. It’s particularly well-studied as a joint supplement.
For joint pain, most clinical trials show significant improvement within 4–6 weeks at 1.5–3g daily. Full benefit typically develops over 12 weeks. For exercise recovery, effects are more immediate — reduced muscle soreness is typically seen within the same training week when MSM is taken consistently. For skin benefits, the clinical study used 16 weeks before measuring outcomes.
Yes — MSM has an excellent safety profile in clinical trials at doses up to 3g daily for 12+ weeks. The most common side effects are mild gastrointestinal discomfort (bloating, nausea) which typically resolve with food. No significant drug interactions are established, but caution is advised with blood thinners as MSM may have mild antiplatelet effects. It is generally well tolerated and can be taken long-term.
This article is for informational purposes only. Consult a healthcare provider before starting MSM supplementation if you take blood thinners or have a pre-existing health condition.
James Hargreaves
Daniel Brooks
Rachel Summers
Dr. Rachel Stone