What is MSM?

MSM — methylsulfonylmethane — is an organosulphur compound with the chemical formula (CH₃)₂SO₂. It is one of the simplest bioavailable sources of sulphur, the third most abundant mineral in the human body by mass.

Small amounts of MSM occur naturally in certain foods. Cruciferous vegetables (broccoli, Brussels sprouts, cabbage), alliums (garlic, onions), and some animal products contain trace quantities, though dietary intakes are typically low — far below the doses used in clinical trials.

Supplemental MSM is synthetic, produced via the oxidation of dimethyl sulfoxide (DMSO). This is standard pharmaceutical chemistry, not a cause for concern. The resulting compound is well-characterised, highly pure, and has been granted Generally Recognised As Safe (GRAS) status. A comprehensive review by Butawan, Benjamin, and Bloomer (2017) confirmed that MSM is well-tolerated at doses of up to 4g per day, with few and mild reported side effects.

MSM does not hold any EU-authorised health claims under EU Regulation 432/2012 (retained in UK law). Every efficacy statement in this article is therefore framed as clinical trial evidence, not as a permitted health claim.

Why does sulphur matter?

Sulphur is a structural component of two amino acids: methionine and cysteine. These sulphur-containing amino acids are not peripheral players — they are fundamental to the architecture of several proteins that define the structural integrity of the body.

Disulphide bonds — covalent bonds between cysteine residues — are the cross-links that stabilise the three-dimensional structure of proteins including:

Without adequate sulphur, the body cannot form these cross-links properly. The result is compromised structural integrity across connective tissue, skin, and hair.

Cysteine is also a precursor to glutathione — the body's primary endogenous antioxidant. Glutathione is a tripeptide (glutamate-cysteine-glycine), and the cysteine residue provides the thiol group that gives glutathione its antioxidant capacity. Sulphur availability therefore has downstream relevance to oxidative stress management.

This is the mechanistic rationale for MSM. It provides bioavailable sulphur that can be incorporated into methionine and cysteine pools, supporting the structural and antioxidant systems that depend on these amino acids. The question is whether supplemental MSM, at realistic doses, translates this mechanism into measurable clinical outcomes.

What does the clinical evidence show for joint function?

Two randomised controlled trials form the core evidence base for MSM and joint function. Both focused on knee discomfort associated with osteoarthritis.

Kim et al. (2006) conducted a randomised, double-blind, placebo-controlled pilot trial with 50 men and women aged 40–76 with knee osteoarthritis. Participants received either 3g of MSM twice daily (6g total) or placebo for 12 weeks. The MSM group showed statistically significant changes in WOMAC pain and physical function scores compared to placebo, and improvements in activities of daily living on the SF-36 assessment.

Debbi et al. (2011) conducted a randomised, double-blind, placebo-controlled trial with 49 men and women aged 45–90 with knee osteoarthritis. Participants received 1.125g of MSM three times daily (3.375g total) for 12 weeks. The MSM group reported statistically significant improvements in pain and physical function compared to placebo, though the authors noted these improvements were small and their clinical significance required further investigation.

These are encouraging results, but context matters. Both trials were small (49–50 participants), short (12 weeks), and focused specifically on knee osteoarthritis. The doses differed substantially (3.375g vs. 6g per day). Larger, longer-duration trials with standardised dosing would strengthen the evidence considerably. MSM is not a treatment for osteoarthritis or any joint condition — but the clinical data provides a rational basis for its inclusion in joint-focused formulations.

For a broader review of joint-relevant nutrients, including those with authorised health claims, see our guide on supplements for joint pain.

What does the clinical evidence show for skin?

Muizzuddin and Benjamin (2022) conducted a two-part study examining oral MSM supplementation and signs of skin ageing. In the pilot phase, 20 participants ingested either 3g per day of MSM or placebo for 16 weeks. In the dose-response phase, 63 participants ingested either 1g or 3g of MSM per day for 16 weeks.

Results showed improvements in the number and severity of facial wrinkles, skin firmness, elasticity, and hydration compared to baseline, assessed by both expert clinical grading and instrumental measurements. Some parameters exhibited a dose-response relationship, with 3g per day showing greater effects than 1g per day, though the lower dose also appeared effective.

This is a well-designed study with a meaningful sample size in the dose-response phase, and the 16-week duration is reasonable for skin outcomes. The mechanistic logic is coherent — sulphur is required for collagen and elastin cross-linking, and MSM provides bioavailable sulphur. However, this remains a single study. Replication by independent research groups would meaningfully strengthen the evidence.

It is worth noting that vitamin C holds an authorised claim that it "contributes to normal collagen formation for the normal function of skin" — a complementary mechanism, since vitamin C is required for collagen hydroxylation while sulphur is required for collagen cross-linking. For more on this relationship, see our article on collagen and vitamin C. A broader review of skin-relevant nutrients can be found in our guide to vitamins for skin.

What does the clinical evidence show for exercise recovery?

Two studies have examined MSM in the context of exercise-induced muscle damage and recovery.

Kalman et al. (2012) conducted a pilot study with 8 healthy, moderately trained men randomly assigned to 1.5g or 3g of MSM per day for 30 days (28 days before and 2 days following an exercise challenge). The 3g dose was associated with a trend toward reduced muscle soreness (p = 0.080) and a significant increase in total antioxidant capacity (TEAC) following exercise (p = 0.035). Homocysteine decreased following exercise for both dosages combined (p = 0.007).

Withee et al. (2017) conducted a double-blind, randomised, placebo-controlled trial with 22 healthy runners who took either 3g of MSM or placebo daily for 21 days before a half-marathon and 2 days after. MSM supplementation attenuated post-exercise muscle and joint pain at clinically meaningful levels, though the differences did not reach statistical significance — a limitation the authors attributed to the small sample size.

The exercise recovery evidence is preliminary. Both studies were small, and the Kalman study lacked a placebo arm (comparing two MSM doses rather than MSM versus placebo). The Withee study was better designed but underpowered. The proposed mechanism — that MSM supports antioxidant capacity via sulphur's role in glutathione metabolism — is plausible, but the clinical data is not yet sufficient to draw firm conclusions.

Is there evidence for MSM and hair?

The evidence base for MSM and hair specifically is thin. No large-scale human trial has measured hair growth or hair quality as a primary outcome of MSM supplementation.

The mechanistic rationale, however, is coherent. Hair is composed primarily of keratin, and keratin's structural integrity depends on disulphide bonds between cysteine residues. Sulphur is, quite literally, what holds keratin together. MSM provides bioavailable sulphur that can contribute to the cysteine pool used in keratin synthesis.

An animal study by Hummadi, Gany, and Hadi (2022) evaluated topical MSM in mice and found effects on hair growth markers, but animal studies using topical application have limited relevance to oral supplementation in humans.

The honest position: the biological rationale for MSM and hair is sound, but the clinical evidence lags behind the mechanism. MSM is included in hair-relevant formulations on the basis of its role as a sulphur donor for keratin, not on the basis of definitive clinical proof. For a complete review of nutrients with authorised and evidence-based roles in hair health, see our guide to vitamins for hair growth.

What can MSM not claim?

Transparency about limitations matters as much as presenting the evidence.

MSM holds no EU-authorised health claims under EU Regulation 432/2012. This means no manufacturer can legally state that MSM "contributes to" any specific health function in the way that, for example, vitamin C can claim to contribute to normal collagen formation, or zinc can claim to contribute to the maintenance of normal hair.

The clinical evidence reviewed above is promising but early-stage. The joint trials were small. The skin study, while well-designed, has not yet been independently replicated. The exercise recovery data is preliminary. The hair evidence is largely mechanistic rather than clinical.

MSM is not a medicine. It does not treat, cure, or prevent any disease. It should not be used as a substitute for medical advice or treatment. If you have a diagnosed joint condition, skin condition, or any other medical concern, consult a healthcare professional.

What MSM does have is a clear biochemical role (sulphur donation for structural proteins and antioxidant systems), a reasonable safety profile (well-tolerated at up to 4g per day), and a growing — though not yet definitive — body of clinical trial evidence across several outcome domains.

How does PARTICULAR use MSM?

PARTICULAR includes MSM (methylsulfonylmethane) at a dose of 500–750mg per day in its personalised formulations. This is lower than the doses used in the clinical trials reviewed above (typically 3–6g per day), reflecting a formulation designed for daily long-term use as part of a multi-nutrient blend rather than a standalone therapeutic intervention.

MSM is included when the questionnaire indicates joint health, skin, or connective tissue goals. It sits alongside other nutrients relevant to these outcomes — vitamin C for collagen formation, zinc for maintenance of normal skin and hair, and manganese for connective tissue formation — each of which carries its own authorised health claims.

Each nutrient is delivered in its own individually coated microgranule, avoiding competitive absorption and allowing targeted release at specific points in the digestive tract. Your daily formula is mixed to order based on your individual profile — not pulled from pre-made stock.

You can view the full detail on MSM as an ingredient or take the questionnaire to find out whether MSM is included in your personalised formula.

Key takeaways

  1. MSM (methylsulfonylmethane) is an organosulphur compound that provides bioavailable sulphur — the third most abundant mineral in the human body and a structural component of collagen, keratin, and elastin

  2. MSM holds no EU-authorised health claims — every efficacy statement is based on clinical trial evidence, not regulatory approval

  3. Two RCTs suggest MSM may contribute to improvements in joint function — Kim et al. (2006) and Debbi et al. (2011) both found statistically significant changes in pain and function scores, though sample sizes were small

  4. Clinical evidence suggests MSM may contribute to improvements in skin appearance — Muizzuddin and Benjamin (2022) found dose-dependent improvements in wrinkle severity and skin firmness over 16 weeks

  5. Exercise recovery evidence is preliminary — small studies suggest MSM may support antioxidant capacity and reduce post-exercise soreness, but larger trials are needed

  6. The hair evidence is mechanistic rather than clinical — sulphur is essential for keratin structure, but large-scale human trials measuring hair outcomes are lacking

  7. MSM is well-tolerated at doses up to 4g per day with few and mild side effects

  8. PARTICULAR includes MSM at 500–750mg when joint, skin, or connective tissue goals are indicated — personalised via questionnaire and delivered as individually coated microgranules

Sources cited in this article: