MSM (methylsulfonylmethane) is a sulfur-containing compound that improves skin hydration, elasticity, and texture when taken as a supplement or applied topically. Sulfur is a building block of keratin and collagen, two proteins that give skin its structure and firmness. MSM provides a bioavailable form of sulfur and also acts as an anti-inflammatory and antioxidant, which is why it shows up in both oral supplements and topical skincare products.
How MSM Affects Skin Elasticity and Hydration
The most direct evidence for MSM’s skin benefits comes from clinical trials measuring hydration and elasticity. In a randomized, placebo-controlled study published in The Journal of Clinical and Aesthetic Dermatology, participants who took an MSM-containing supplement for 60 days saw skin elasticity improve by 15.9 to 22.6 percent depending on the facial area measured. Hydration increased by 12.6 to 17.6 percent across the forehead, around the eyes, and near the mouth. Wrinkle depth also improved slightly in the supplemented group, particularly around the eyes.
These changes happen because sulfur is essential for producing collagen and maintaining the bonds that keep skin firm. As you age, collagen production slows and existing collagen breaks down faster. MSM appears to influence gene expression related to skin barrier function, moisturization, and structural integrity, essentially nudging the skin’s repair processes in a favorable direction.
Reducing Redness and Irritation
MSM’s anti-inflammatory properties make it useful for reactive or easily irritated skin. A double-blind, placebo-controlled study of 46 patients with rosacea found that a topical treatment containing MSM (combined with silymarin, a plant extract) produced statistically significant improvements in skin redness, papules, itching, and hydration. The improvements were measured both visually and with instruments that track skin color and moisture levels.
This anti-inflammatory effect isn’t limited to rosacea. MSM has been shown to lower levels of inflammatory signaling molecules in the body, which is relevant for any skin condition driven by chronic inflammation, including acne. While large-scale acne-specific trials are still limited, MSM’s ability to reduce oxidative stress and calm inflammatory pathways suggests a plausible benefit for breakout-prone skin.
Oral Supplements vs. Topical Products
You can get MSM through both oral supplements and creams or serums, and the two routes work differently. Oral MSM is absorbed through the gut and distributed systemically, meaning it reaches the skin from the inside. This is the form used in most clinical trials showing improvements in elasticity and hydration. Topical MSM works on the surface and has an interesting additional property: it enhances the penetration of other ingredients through the skin barrier. Research has shown that MSM facilitates transmembrane transport, helping other active compounds cross into deeper skin layers where they can be more effective.
This penetration-enhancing quality is why MSM shows up in formulations alongside other actives. If you’re using a topical product with MSM, it’s likely doing double duty: delivering sulfur directly to the skin while helping the rest of the formula absorb better.
MSM Works Better With Certain Ingredients
One of the more practical findings about MSM is that it appears to amplify the effects of collagen supplements. A clinical trial published in the journal Nutrients compared collagen supplements with and without MSM. The researchers found that adding MSM to collagen (at either 5 or 10 grams of collagen) was crucial for achieving significant improvement in dermal thickness. Collagen with vitamin C alone, even at 500 mg of vitamin C, did not produce the same results without MSM in the mix.
This suggests that if you’re already taking a collagen supplement for skin health, pairing it with MSM could meaningfully boost the outcome. The sulfur MSM provides may support the cross-linking of collagen fibers, making the new collagen your body produces more structurally sound. Vitamin C remains important for collagen synthesis, but MSM appears to add something vitamin C alone doesn’t cover.
Safety and Dosing
MSM has a strong safety profile. The FDA has reviewed it and raised no questions about its Generally Recognized as Safe (GRAS) status for use in foods and supplements. Across twelve published human clinical trials, none reported adverse effects at doses ranging from about 3,400 mg to 6,000 mg per day for a 60 kg (132 lb) adult. Most skin-focused supplements contain 1,000 to 3,000 mg of MSM per day, well within studied ranges.
Side effects are uncommon but can include mild digestive discomfort, particularly at higher doses. Starting with a lower dose and increasing gradually is a reasonable approach. Topical MSM is generally well tolerated and rarely causes irritation, which makes sense given that the compound occurs naturally in many fruits, vegetables, and grains.
What to Realistically Expect
MSM isn’t going to produce overnight changes. The clinical improvements in elasticity and hydration were measured at the 60-day mark, so you should plan on at least two months of consistent use before evaluating results. The changes are also moderate, not dramatic. A 15 to 22 percent improvement in elasticity is noticeable, particularly in areas like the forehead and around the eyes where skin tends to lose firmness first, but it won’t replicate the effects of a cosmetic procedure.
Where MSM is most useful is as a steady, low-risk addition to a broader skin care routine. It addresses multiple underlying factors at once: sulfur supply for collagen, inflammation reduction, antioxidant support, and improved absorption of other topical ingredients. For people dealing with dull, dry, or reactive skin, or those looking to slow visible aging, it covers a lot of ground for a single supplement.