MSM (Methylsulfonylmethane)

EVIDENCE: WEAK

Also sold as: methylsulfonylmethane, dimethyl sulfone, MSM, DMSO2

MSM is a sulfur-containing compound studied for knee-arthritis pain at 3–6 g daily. The small trial record is not compelling. No human dental benefit is established; the proposed link to gum connective tissue remains theoretical.

Compiled by iSupplementReviews editorial team ·Updated 2026-10-06 · 4 sources

Type: Organosulfur compound
Studied dose: Osteoarthritis trials 3–6 g/day for 12+ weeks; no dental dose exists
Best form: Pure MSM powder is the studied form; label here gives no dose and no form specification — it's inside a group of ingredients with undisclosed amounts
Upper limit: No formal upper intake limit — trials show good tolerance to ~6 g/day; digestive upset/headache are the common complaints
Our rating: WEAK — Mostly small, animal, or traditional evidence

What is MSM?

MSM is a sulfur-containing compound related to DMSO and sold for joint health. The proposed explanation concerns sulfur in connective tissues such as collagen and cartilage. Small trials have studied it separately from common combinations with glucosamine or chondroitin.

What does the research show?

Claim	Evidence	Dose studied	Verdict
Knee arthritis pain/function	Several trials — statistically positive, clinically modest	3–6 g/day ×12 wk	Weak-positive
Exercise muscle soreness	Small trials, mixed	3 g/day	Mixed
Allergic rhinitis	One small trial	2.6 g/day	Weak
Dental/gum outcomes	No human data	—	Unproven

What dose was studied?

3–6 g/day for months: the gram tier. In an undosed dropper tail the MSM share can’t reach even 1% of studied range; it’s a name on a list.

Side effects

Digestive upset, bloating, headache, insomnia: mild and uncommon at studied doses; tolerance to 6 g/day is documented as good.

Drug interactions

None clinically established. Theoretical cautions: sulfur-sensitivity claims are folklore-level; possible mild additive effect with other gut-active supplements.

Who should not take it

No established contraindications; pregnancy/lactation unstudied (standard caution); at the doses present here, no group is meaningfully exposed.

What the authorities say

MSKCC: evidence for joint pain is limited and results inconsistent; safety good. No dental or periodontal body has ever evaluated or recommended MSM for oral use; the category simply doesn’t exist in the literature.

What to know about MSM

MSM has limited joint-pain research and no established human dental benefit. The fact that gums contain connective tissue does not prove supplementation helps them. Study amounts of 3–6 g differ from small, undisclosed blend quantities.

Frequently asked questions about MSM (Methylsulfonylmethane)

Does MSM help teeth or gums?

Human trials have not established MSM benefits for gingivitis, periodontitis, cavities or enamel. MSM supplies sulfur, and gums contain connective tissue, but those biological facts do not demonstrate a dental benefit. Neem, sage and licorice have some mouthrinse research; MSM does not have comparable dental trials.

What does MSM do in studies?

Knee osteoarthritis is the main ingredient: several trials show modest pain/function improvement vs placebo at 3–6 g/day over 12+ weeks. Statistically real but clinically small and inconsistent between trials. Muscle-soreness and allergy-rhinitis trials are smaller and mixed. It's the 'probably does something small for joints' ingredient.

How much MSM was studied?

3–6 g/day: grams, sustained for months. An undosed share of a ~0.2 mL dropper serving can't get within two orders of magnitude of that range even if it were the only ingredient in the tail.

Is MSM safe?

Trials report good tolerability to ~6 g/day; the complaints are digestive upset, headache, bloating, insomnia in some. It's a degradation product related to DMSO but without DMSO's odor or potency; general-population safety at supplement doses is well-established.

Why is MSM in a dental product?

Because 'sulfur for connective tissue' reads well on a label and MSM is a cheap, shelf-stable powder already in the shared supplement-ingredient library: the same reason chromium (a blood-sugar mineral) ended up in this product family's mineral dental stack. It's a template inclusion, not a dental act.