What the Research Really Says About MSM for Skin

Carla Voss 2026-08-23

By the Bulk MSM Editorial Team | Updated August 24, 2026

Dimethyl sulfone—better known as MSM—appears in dietary supplements, creams, serums, and products marketed for concerns ranging from wrinkles to rosacea. That broad commercial presence can make the evidence seem more settled than it is.

The reality is narrower. MSM is a genuine cosmetic ingredient and supplement with a small body of human skin research. Oral MSM has produced a promising signal for certain visible signs of photoaging, but the principal evidence includes a very small placebo-controlled pilot and a larger dose comparison without a placebo group. Evidence for topical MSM and specific skin conditions is generally weaker, often involves other active ingredients, and does not establish MSM as an alternative to sunscreen, retinoids, medical treatment, or appropriate wound care.

Dimethyl sulfone, MSM, and DMSO2: the names explained

Dimethyl sulfone, methylsulfonylmethane, MSM, and DMSO2 refer to the same organosulfur compound. MSM occurs at low concentrations in foods such as fruits, vegetables, grains, beverages, and milk. Commercial MSM can also be manufactured by oxidizing dimethyl sulfoxide and then purifying the resulting compound. It is sold as an oral dietary supplement and included in topical personal-care products. A review of MSM’s chemistry and applications describes its names, food occurrence, manufacturing methods, and relationship to dimethyl sulfoxide.

MSM is not the same substance as dimethyl sulfoxide, or DMSO. MSM can be described as an oxidized metabolite or derivative of DMSO, but the compounds are not interchangeable. Claims about DMSO’s penetration, odor, medical uses, adverse effects, or performance cannot automatically be transferred to MSM.

That distinction matters because chemical relatedness does not demonstrate equivalent absorption, efficacy, or safety. Each compound—and each route of use—must be evaluated on its own evidence.

In cosmetics, dimethyl sulfone has recognized formulation roles. Its listed functions are solvent and viscosity controlling, and ingredient databases identify it in creams, serums, cleansers, gels, lotions, toners, and moisturizers. Those listings document how an ingredient may function in a formula and where it is used; they do not demonstrate that it improves wrinkles or treats a skin disorder. The CosIng-derived ingredient entry for dimethyl sulfone illustrates that distinction.

Four questions are easily confused:

Is MSM present in the product?
Does it serve a practical formulation function?
Is it present in a suitable concentration and vehicle to reach the intended target?
Has the finished product produced a meaningful benefit in a controlled human trial?

An ingredient list can answer the first question. A cosmetic database may help with the second. Neither establishes skin penetration or clinical efficacy. Product availability, front-label claims, patents, or long lists of MSM-containing cosmetics are not clinical validation.

The short answer: how strong is the evidence for MSM and skin?

Oral MSM has limited but promising evidence for certain visible photoaging outcomes. Topical and disease-specific evidence is preliminary and often cannot isolate MSM’s effect from that of other ingredients.

A 2026 systematic review identified only seven eligible studies involving 416 participants: six randomized controlled trials and one case report. Four studies evaluated oral formulations and three evaluated topical formulations. Treatment lasted from 28 to 168 days, with most randomized trials running for eight to 12 weeks. Exact oral doses in three photoaging studies ranged from approximately 400 to 3,000 milligrams daily. Reported adverse events were generally mild and transient, with no serious treatment-related events or withdrawals identified during follow-up lasting no more than 24 weeks. These findings apply only to the studied products, populations, and periods, as detailed in the systematic review of MSM-containing dermatology products.

The studies were too heterogeneous to justify a broad conclusion that “MSM improves skin.” They examined different conditions, routes, doses, formulations, comparators, and outcomes. Measures ranged from wrinkle grading, hydration, elasticity, and firmness to acne lesion counts, erythema, nail severity, and dermal thickness. Sample sizes ranged from a single-patient case report to trials with more than 100 participants.

Several interventions did not test MSM alone. Co-ingredients included silymarin, collagen, vitamin C, hyaluronic acid, L-carnosine, Equisetum arvense, olivamine, and other compounds. When a combination performs better than a comparator, the result supports the combination as tested—not necessarily MSM as an independent active ingredient.

Route matters just as much as formulation:

Oral human evidence asks whether ingesting a particular MSM preparation changes a measured human outcome.
Topical human evidence asks whether a cream or other vehicle produces an effect where it is applied.
Injected-animal evidence examines a different exposure route in a nonhuman model.
Laboratory mechanisms can generate hypotheses but do not establish that a consumer product works.

An oral trial cannot validate a serum, and an injected-mouse experiment cannot prove that a supplement prevents human sun damage.

Within this small evidence base, oral MSM for photoaging produced the strongest relative signal. Acne, erythematous-telangiectatic rosacea, and nail psoriasis had lower-certainty evidence, while X-linked ichthyosis had the weakest. Here, “strongest” means most promising among a small and uneven group of studies—not conclusive, independently replicated, or sufficient for a treatment claim.

Oral MSM for wrinkles, hydration, firmness, and elasticity

The main oral anti-aging research lasted 16 weeks and should be understood as two separate studies, not as one 83-person placebo-controlled trial.

Part I: a very small placebo-controlled pilot

Part I enrolled 20 women. Eleven took 3 grams of oral MSM daily, while nine took rice-flour placebo capsules. The double-blind pilot assessed participants at baseline, eight weeks, and 16 weeks through expert visual grading and participant self-assessment.

Investigators reported statistically significant improvements versus placebo in facial wrinkles and skin roughness. That is the most direct controlled evidence behind the claim that oral MSM might improve visible photoaging.

The sample was nevertheless tiny. A statistically significant result among 20 completers is a signal worth testing, not proof of a large, reliable, or broadly generalizable cosmetic effect. The supplied results also do not provide enough information to determine how noticeable the average change would be in ordinary use.

Part II: a larger comparison without placebo

Part II included 63 participants assigned to either 1 or 3 grams of MSM daily. Researchers assessed wrinkles, firmness, elasticity, and hydration through expert clinical grading, photographs, a Cutometer, and a Corneometer. Both groups reportedly improved from baseline, although some outcomes favored 3 grams.

The decisive limitation is that this phase compared two active doses and, based on the reported methods, did not include a placebo group. Changes from baseline therefore cannot exclude expectation effects, natural fluctuation, seasonal changes, measurement variation, or contributions from participants’ existing skincare routines.

Participants continued using their usual facial products but were instructed not to change products or undergo procedures such as fillers or Botox. Keeping routines stable reduces one possible source of variation, but it does not supply the counterfactual created by a placebo group.

The published oral MSM study reports the 20-person placebo-controlled pilot, the separate 63-person active-dose phase, the 16-week duration, and the measured wrinkle, roughness, hydration, firmness, and elasticity outcomes.

Who was studied?

The methods describe women aged 35 to 59 with Fitzpatrick skin types I through IV, visible crow’s-feet, and loss of firmness or elasticity. The findings should not automatically be generalized to:

Men
Younger or older adults
People with Fitzpatrick skin types V or VI
People without similar baseline photoaging
People with inflammatory or medically diagnosed skin conditions

The study tested a branded oral MSM ingredient, OptiMSM, and one author was affiliated with its supplier, Bergstrom Nutrition. An industry connection does not invalidate a result, but it increases the importance of independent replication. Findings from one branded ingredient should not be presumed identical for every powder, capsule, cream, or serum.

What the study does not establish

The research did not validate topical MSM. It also did not prove that MSM stimulates collagen in human skin or treats acne, rosacea, wounds, eczema, pigmentation, or another skin disorder. Those questions require separate trials using the relevant route, formulation, population, and outcome.

The doses used in oral photoaging research are experimental regimens, not established universal skincare doses. In particular, the finding that both 1 and 3 grams produced changes from baseline in Part II does not establish that 1 gram is sufficient or optimal, because neither dose was compared directly with placebo during that phase.

Follow-up ended after 16 weeks, so the study did not determine whether any visible changes persisted after supplementation stopped.

Overall, oral MSM for photoaging is best described as promising but unconfirmed. The controlled finding came from a very small pilot, while the larger phase documented changes from baseline without a placebo comparison.

Topical MSM: what creams and serums can—and cannot—claim

Results from oral MSM studies do not prove that an MSM cream or serum works. Swallowing a supplement and applying a cosmetic involve different exposure pathways, formulations, concentrations, and potential biological effects.

Cosmetic databases list dimethyl sulfone as a solvent and viscosity-controlling ingredient, not as a clinically established anti-aging or anti-inflammatory treatment. Ingredient presence must therefore be distinguished from effective concentration, skin penetration, and demonstrated benefit from the finished product.

For a topical claim to be persuasive, researchers would need to consider:

The MSM concentration
The vehicle carrying it
Stability in the finished formula
How much reaches the intended target in intact human skin
Frequency and duration of application
The placebo or vehicle comparator
Whether other ingredients could explain the result

Current evidence does not establish a standard effective concentration for topical MSM used alone. It also does not adequately establish how much MSM penetrates intact human skin from common creams or serums. Reports involving combination products do not settle either question because the observed effect could come from MSM, the vehicle, co-ingredients, surface moisturization, or an interaction among them.

What about the rosacea cream?

The most frequently cited topical rosacea evidence involved a cream containing both silymarin and MSM. The combination was associated with possible improvements in redness, hydration, and itching, but it did not test MSM alone. The result cannot show how much of the effect came from MSM, silymarin, the cream base, or their interaction. An evidence review of MSM for skin conditions emphasizes that large clinical trials are lacking and that the rosacea and wound findings involved combination interventions.

An MSM-only cream cannot claim the result of the silymarin-MSM formula. Nor can another multi-ingredient product assume equivalence merely because MSM appears on both labels.

Commercial formats include cleansers, gels, creams, toners, lotions, moisturizers, and serums, but format matters. A rinse-off cleanser is not comparable to a leave-on cream.

As a cautious consumer step, a new topical cosmetic can be patch tested according to its directions before broader use. Stop using the product if it causes a significant rash, hives, marked itching, or swelling.

One randomized trial associated topical MSM with increased lower-extremity swelling in participants with venous insufficiency. That finding does not show that MSM causes swelling in everyone, but people with venous insufficiency or recurrent leg edema should obtain clinician guidance before applying it to affected lower legs. The population-specific finding is summarized in this MSM safety assessment.

Claim-by-claim verdict: rosacea, acne, psoriasis, ichthyosis, wounds, and UV damage

The available research covers several distinct products and conditions. Where the supplied evidence does not establish the exact standalone MSM formulation, that uncertainty is stated rather than filled with assumptions.

Claim	Route or formulation	Study type	Reported outcome	Decisive limitation
Rosacea	Topical cream containing silymarin and MSM; 46 participants in the cited trial	Small placebo-controlled human study	Possible improvements in redness, hydration, and itching	MSM was not tested alone; the result cannot validate an MSM-only cream or replace standard rosacea care
Acne	MSM-containing intervention; exact formulation details not established from the supplied evidence	Limited randomized human research	Improvement in acne-related outcomes was reported	Preliminary, formulation-specific evidence with limited replication
Nail psoriasis	MSM-containing intervention; exact route and co-ingredients not established from the supplied evidence	Limited randomized human research	Improvement in nail severity was reported	Small and heterogeneous evidence base; not proof that MSM treats psoriasis
X-linked ichthyosis	MSM-containing intervention; full formulation details not established from the supplied evidence	Single-patient case report	Improvement was described	A case report cannot establish efficacy and represented the weakest evidence
Wound healing	MSM blended with silk sericin or other ingredients	Combination-product research	Improved healing-related outcomes were reported	MSM’s independent contribution was not established
UV damage and wrinkles	Injected MSM in UVB-exposed mice	Controlled animal experiment	Better wrinkle and tissue measures than saline on several outcomes	MSM was injected into mice; the study cannot validate human creams, supplements, or sunscreen claims
Eczema, pigmentation, ordinary dry skin, or wounds treated with MSM alone	No adequate MSM-only clinical evidence identified	Insufficient evidence	No reliable treatment conclusion	Product claims exceed the available condition-specific evidence

The acne, nail-psoriasis, and ichthyosis assessments come from the same small, heterogeneous literature summarized by the 2026 dermatology systematic review. Its ranking is comparative, not definitive.

For wound healing, reports involving MSM combined with silk sericin or other components cannot establish an MSM-only benefit. Wounds also differ in cause, depth, contamination, circulation, and infection risk. A cosmetic MSM product should not replace appropriate assessment and care.

What the UVB mouse study actually showed

The animal experiment used 20 male hairless mice divided into four groups of five: a non-UVB saline group, a UVB-plus-saline group, a UVB-plus-MSM group, and a UVB-plus-retinoic-acid group. MSM was injected rather than applied as a cosmetic or taken orally.

Compared with UVB-exposed mice receiving saline, the MSM group had better reported wrinkle scores, less epidermal thickening, more linear elastic fibers, and less collagen loss. MSM generally performed less favorably than the retinoic-acid control for wrinkle score, epidermal thickness, and elastic-fiber linearity. The published UVB mouse experiment documents the route, group sizes, outcomes, and retinoic-acid benchmark.

This was a small, experimentally induced animal model involving injection and only five mice per group. It cannot establish that oral MSM or an MSM cream prevents sun damage in humans. It also does not justify claims that MSM “repairs UV damage” or works like a retinoid.

Proposed antioxidant or anti-inflammatory mechanisms do not change that conclusion. A plausible mechanism may justify further research, but it does not demonstrate that a retail product produces a clinically meaningful benefit.

MSM should not replace:

Broad-spectrum sunscreen and other sun-protective measures
An appropriately used retinoid for photoaging or acne
Standard acne or rosacea care
Prescription treatment for psoriasis or ichthyosis
Appropriate wound assessment and treatment
Clinical evaluation of persistent, painful, changing, or unexplained skin symptoms

Safety: low reported hazard is not the same as proven benefit

Three questions should remain separate:

Does an ingredient have a low reported hazard under a particular rating system?
Does it perform a useful cosmetic formulation function?
Does it produce a meaningful clinical skin benefit?

A favorable answer to the first or second question does not prove the third.

The Environmental Working Group assigns dimethyl sulfone a hazard score of 1 but rates data availability as “Limited.” EWG lists low concern for cancer, allergies or immunotoxicity, developmental and reproductive toxicity, and use restrictions, and it does not currently place the ingredient on its Restricted or Unacceptable Lists. These are conclusions within EWG’s methodology, not proof that every concentration, route, formulation, duration, or user circumstance is safe. Those qualifications appear in EWG’s dimethyl sulfone assessment.

The short-term dermatology record is reasonably reassuring but narrow. Mild, transient events in studies lasting no more than 24 weeks cannot establish safety during indefinite use, in unstudied populations, or with every commercial formulation.

Reported oral effects include gastrointestinal upset, bloating, constipation, diarrhea, indigestion, headache, fatigue, concentration problems, and insomnia. Pregnancy and lactation safety and efficacy information is also lacking, according to a medically reviewed MSM monograph.

Rash, hives, or marked itching may indicate an allergic reaction and warrant stopping the product and obtaining medical advice. Seek emergency care for trouble breathing or swelling of the face, lips, tongue, or throat. Cleveland Clinic’s oral MSM safety guidance also advises consumers to review anticoagulants, NSAIDs, and other herbal supplements with their care team because the interaction list may not be complete.

Pregnancy and breastfeeding data remain inadequate. People who are pregnant, trying to conceive, or breastfeeding should not infer safety from MSM’s occurrence in foods, presence in cosmetics, or short-term use in other populations.

The venous-insufficiency concern is specific but important. Increased lower-extremity swelling was associated with topical MSM in one trial involving people with venous insufficiency. It should not be generalized into a claim of universal topical harm, but it is relevant to anyone considering applying MSM to legs affected by impaired circulation or recurrent edema.

Likewise, generally recognized as safe status for a particular ingredient does not establish skin efficacy, equivalent purity across retail products, or safety during indefinite use. Hazard, efficacy, quality, dose, route, and duration are separate dimensions.

How to evaluate an MSM supplement or skincare product

Begin with the route. Ask whether the marketing claim comes from oral human research, a topical combination trial, injected-animal research, or a proposed laboratory mechanism. If the product route does not match the evidence, the claim has already been stretched.

For an oral supplement

Compare the label with the exact formulation and regimen used in the relevant research. The principal anti-aging program studied branded oral MSM for 16 weeks, using 3 grams daily in the placebo-controlled pilot and 1 or 3 grams daily in the active-dose comparison. These were study conditions, not personal recommendations.

Check:

The amount of MSM per serving, rather than total capsule weight
How many capsules make up one serving
The full ingredient and excipient list
Manufacturer and lot information
Whether the company reports identity, purity, and contaminant testing
Whether the marketed ingredient is the same branded form used in the cited research

Dietary supplement purity and strength can vary, and products may contain ingredients not listed on the label. Findings from OptiMSM should not automatically be applied to every powder or capsule.

For a topical product

Look for a disclosed MSM concentration and evidence on the exact finished formula. Current research does not establish a universal effective topical concentration, so a percentage on a label cannot be judged against a validated standard.

Record the co-ingredients. If marketing cites rosacea research, determine whether the tested formula also contained silymarin. Ingredients such as humectants, occlusives, niacinamide, exfoliants, retinoids, botanical extracts, and fragrance may contribute to improvement, irritation, or both.

Also distinguish between:

Leave-on and rinse-off products
Face and body formulations
Cosmetic testing and disease-treatment trials
Consumer satisfaction surveys and blinded clinical assessments
Improvement from baseline and improvement versus placebo or vehicle

Claims that MSM “detoxifies,” “rebuilds collagen,” “repairs sun damage,” “cures rosacea,” or “reverses wrinkles” exceed the evidence. A statistically significant result also does not necessarily mean that the benefit will be large or visible for an individual user.

For a new topical cosmetic, patch test according to the product directions as a general precaution. Discontinue use for rash, hives, marked itching, or swelling.

Review personal risk factors

Discuss oral MSM—or medically relevant topical use—with an appropriate clinician or pharmacist if any of the following applies:

Pregnancy, plans for pregnancy, or breastfeeding
Venous insufficiency or recurrent leg swelling
A history of allergies to supplements or cosmetic ingredients
Use of anticoagulants
Use of NSAIDs
Use of multiple herbal or dietary supplements
Persistent or diagnosed skin disease
An open, infected, slow-healing, or otherwise concerning wound

A persistent or diagnosed skin condition deserves evidence-based assessment rather than self-treatment with MSM. Redness, for example, can have several causes that an ingredient label cannot distinguish.

Bulk MSM states that it is an educational publisher, sells no supplements, operates no affiliate storefront, and accepts no paid brand placement. These are the site’s own disclosures rather than independently verified claims, as explained on the About Bulk MSM page.

This article provides general educational information, not individualized medical advice. Decisions involving supplements, persistent skin conditions, medication interactions, pregnancy, wounds, or significant reactions should be discussed with a qualified healthcare professional.

What researchers still need to establish

The existing findings justify better studies, not broad treatment claims.

For oral MSM and photoaging, the next priority is an adequately powered, independently funded, placebo-controlled trial. It should prespecify clinically meaningful outcomes, report complete effect sizes and confidence intervals, and distinguish instrumental changes from differences visible to participants and independent evaluators.

Researchers also need to determine whether any benefits persist after supplementation stops. A 16-week endpoint cannot show whether a change is durable or dependent on continued use.

The 1-gram and 3-gram regimens need direct comparison against placebo in the same trial. Until then, neither can be called sufficient, optimal, or universally appropriate.

For topical MSM, credible evidence would require:

MSM-only testing
A matching vehicle control
A disclosed MSM concentration
A standardized application schedule
Validated clinical outcomes
Adequate blinding
Sufficient sample size
Complete adverse-event reporting

Researchers also need to measure how much MSM penetrates intact human skin from common cosmetic vehicles. Penetration should not be inferred from MSM’s chemical relationship to DMSO or from results obtained with a multi-ingredient cream.

Future studies should enroll a broader range of participants across sex, age, Fitzpatrick skin type, baseline photoaging, and sensitive-skin status. Results from middle-aged women with skin types I through IV should not be treated as universal.

Longer follow-up is needed, together with more complete monitoring for adverse effects and possible interactions. Pregnancy and breastfeeding require particular caution because the current evidence does not support confident safety conclusions.

Trials should also isolate MSM from silymarin, collagen, vitamin C, hyaluronic acid, L-carnosine, silk sericin, and other co-ingredients. Combination studies can evaluate a finished product, but they cannot determine whether MSM itself is necessary.

Direct comparative human research would be required before making claims against established options such as retinoids, broad-spectrum sunscreen, azelaic acid, niacinamide, ordinary moisturizers, or prescription therapies. A better result than saline in an injected-mouse model is not comparative evidence against standard human skincare.

Until those questions are answered, uncertainty should be stated plainly rather than replaced with theories about sulfur, collagen synthesis, detoxification, antioxidant activity, or inflammation.

Frequently asked questions

Is dimethyl sulfone the same as MSM?

Yes. Dimethyl sulfone, methylsulfonylmethane, MSM, and DMSO2 refer to the same organosulfur compound.

MSM is not the same as dimethyl sulfoxide, or DMSO. The compounds are chemically related, but their absorption, uses, safety considerations, and evidence must be evaluated separately.

Does oral MSM reduce wrinkles or improve skin hydration?

Possibly, but the evidence is preliminary. A 20-woman placebo-controlled pilot reported improvements in wrinkles and roughness with 3 grams daily over 16 weeks. A separate 63-person comparison reported improvements from baseline in wrinkles, firmness, elasticity, and hydration with 1 and 3 grams daily, but that phase apparently lacked a placebo group. These details come from the principal oral MSM photoaging study.

The findings support further research, not a universal anti-aging claim or established optimal dose. It is also unknown whether the reported improvements persist after supplementation stops.

Does an MSM cream help rosacea or acne?

There is preliminary evidence involving MSM-containing products, but no solid basis for treating an MSM-only cream as proven therapy.

The rosacea study used a cream combining MSM with silymarin, so MSM’s independent effect is unknown. Acne findings remain limited and formulation-specific. Neither body of evidence establishes MSM as a replacement for standard rosacea or acne care.

What side effects and precautions apply to MSM?

Reported oral effects include gastrointestinal upset, bloating, constipation, diarrhea, indigestion, headache, fatigue, concentration problems, and insomnia. Long-term safety has not been established, pregnancy and breastfeeding information is inadequate, and interaction research remains limited.

Stop the product and obtain medical advice for a significant rash, hives, or marked itching. Seek emergency care for trouble breathing or swelling of the face, lips, tongue, or throat. Review anticoagulants, NSAIDs, other supplements, pregnancy, breastfeeding, and relevant allergies with a clinician. People with venous insufficiency or recurrent leg swelling should obtain advice before applying topical MSM to affected lower legs.

Can MSM replace sunscreen or a retinoid for photoaging?

No. Human research has not shown that MSM prevents UV injury or performs as well as sunscreen or a retinoid.

The frequently cited UVB experiment used injected MSM in groups of five mice, and several outcomes were less favorable than with the retinoic-acid control. That model cannot establish protection during ordinary human sun exposure or validate an oral supplement or cosmetic serum. The experimental design and results are reported in the mouse photoaging study.

Continue broad-spectrum sunscreen and any appropriately prescribed or tolerated photoaging treatment rather than replacing them with MSM.

The bottom line

MSM is a real cosmetic ingredient and supplement, but it is not a proven all-purpose skin treatment. The most credible signal is a possible short-term oral benefit for visible photoaging. That signal rests on limited research: a tiny placebo-controlled pilot, a larger non-placebo dose comparison, branded-product testing, short follow-up, and restricted participant demographics.

Evidence for topical MSM and specific skin conditions is weaker and often confounded by other ingredients. Keep sunscreen and established care in place, scrutinize the exact route and formulation behind every claim, and discuss oral use or medically relevant topical use with a qualified clinician.