Dimethyl Sulfone
Sulfur-containing compound studied as anti-inflammatory in cosmetics. Functional formulation ingredient with no standalone activity on the skin.
Evidence by route
Topical application
Inert formulation ingredient. Safe, no standalone activity.
How to read tiers A–F
- CWeak evidence. In vitro data, open-label studies, or expert consensus
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
About this ingredient
Dimethyl Sulfone (MSM) is a sulfur-containing compound, the end-oxidation product of dimethyl sulfoxide (DMSO). Known as methylsulfonylmethane in dietary supplements; entered cosmetics with an 'organic sulfur source' marketing angle. Mechanism. Sulfur is a structural component of keratin, collagen, elastin, and glutathione (a thiol antioxidant). Manufacturers market MSM as 'building material' for skin and hair. In lab models it suppresses pro-inflammatory cytokines and NF-κB activity. On real skin penetration and efficacy are limited – the molecule is water-soluble and small, but active dermal effect isn't characterized. Where applied. Anti-inflammatory creams and serums, 'sulfur boost' hair products, niche anti-acne and rosacea products. In Spain – Sukin, Nature's Plus, niche artisan brands with 'sulfur for skin' marketing. Evidence base. Oral MSM joint benefit data in RCTs are mixed. Topical skin clinical data are scarce. Berardesca 2008 open-label study showed moderate symptom improvement in rosacea patients with 1% MSM in a cream – result not confirmed in large placebo-controlled RCTs. Safety. CIR confirmed Dimethyl Sulfone safe in cosmetic use. Hypoallergenic, non-comedogenic. Allergic reactions rare. In patients with sulfonamide allergy reactions are theoretically possible, extremely rare in practice. Pregnancy and lactation – safe at standard cosmetic concentrations. Best suited to: sensitive inflamed skin within a multi-component formula. Not a first-line active – evidence base is limited.
Frequently asked questions
Is Dimethyl Sulfone safe during pregnancy?
Dimethyl Sulfone is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What is Dimethyl Sulfone and what does it do in cosmetics?
Sulfur-containing compound studied as anti-inflammatory in cosmetics.
What's the INCI name for Dimethyl Sulfone?
The INCI name is Dimethyl Sulfone. It may also appear as: MSM, Methylsulfonylmethane.
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The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
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