Sulfur/MSM

Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD — GMJ Editorial Board

What is Sulfur/MSM?

Methylsulfonylmethane (MSM) is an organosulfur compound naturally found in plants, animals, and humans. It serves as a bioavailable source of sulfur, an essential mineral that plays crucial roles in protein synthesis, enzyme function, and cellular structure. MSM is chemically represented as (CH₃)₂SO₂ and is also known as dimethyl sulfone or DMSO₂.

Sulfur itself is the third most abundant mineral in the human body, primarily found in amino acids like cysteine and methionine, which are building blocks for proteins including collagen, keratin, and glutathione. While sulfur deficiency is rare due to its presence in protein-rich foods, MSM supplements have gained popularity as a concentrated source of bioavailable sulfur.

Health benefits & uses

Joint health and osteoarthritis (Moderate evidence): Clinical studies suggest MSM may reduce joint pain and improve function in people with osteoarthritis. A 12-week randomized controlled trial found that 6 grams daily of MSM significantly reduced pain and improved physical function compared to placebo.

Submit Your Paper

Exercise recovery and muscle soreness (Limited evidence): Some research indicates MSM supplementation may reduce exercise-induced muscle damage and accelerate recovery. However, studies are small and results are mixed.

Skin, hair, and nail health (Limited evidence): Due to sulfur’s role in collagen and keratin synthesis, MSM is marketed for cosmetic benefits. While biologically plausible, high-quality human studies are lacking.

Anti-inflammatory effects (Limited evidence): Laboratory studies suggest MSM may have anti-inflammatory properties, but human clinical evidence remains preliminary.

How it works

MSM functions primarily as a sulfur donor for various biological processes. Sulfur is essential for:

• Protein synthesis: Incorporated into cysteine and methionine amino acids
• Collagen formation: Supports joint cartilage and connective tissue integrity
• Antioxidant production: Required for glutathione synthesis, a major cellular antioxidant
• Enzyme function: Many enzymes require sulfur-containing amino acids for proper structure
• Cellular membrane integrity: Sulfur compounds help maintain cell membrane flexibility

MSM may also modulate inflammatory pathways and support the body’s natural detoxification processes, though the exact mechanisms are still being studied.

Dosage

There is no established Recommended Daily Allowance (RDA) or Upper Limit (UL) for MSM, as sulfur requirements are typically met through protein intake. For supplementation:

• General use: 1-3 grams daily, typically divided into 2-3 doses
• Joint health: 3-6 grams daily, based on clinical studies
• Athletic recovery: 1-3 grams daily

Start with lower doses and gradually increase to assess tolerance. Take with meals to minimize potential gastrointestinal upset. Consult a healthcare provider before starting supplementation, especially for therapeutic doses above 3 grams daily.

Food sources

While MSM occurs naturally in small amounts in various foods, dietary sources provide relatively low concentrations:

• Dairy products: Milk, cheese
• Protein sources: Meat, fish, poultry, eggs
• Vegetables: Broccoli, Brussels sprouts, cabbage, onions
• Grains: Whole grains, particularly corn
• Beverages: Coffee, tea, beer

Most dietary sulfur comes from sulfur-containing amino acids in protein foods rather than MSM specifically. Supplementation provides much higher concentrations than achievable through food alone.

Safety & side effects

MSM is generally well-tolerated by most people. Common mild side effects may include:

• Gastrointestinal upset (nausea, diarrhea, bloating)
• Headache
• Fatigue
• Skin reactions (rare)

These effects are typically dose-dependent and may decrease with continued use. Taking MSM with food can help minimize gastrointestinal symptoms. Long-term safety data is limited, though no serious adverse effects have been reported in available studies.

Interactions

MSM has few known drug interactions, but potential considerations include:

• Blood-thinning medications: Theoretical increased bleeding risk, though not well-documented
• Other sulfur supplements: May have additive effects
• Vitamin C: Often combined in supplements and may enhance MSM absorption

No significant interactions with common medications have been established, but inform healthcare providers about MSM use, especially before surgery or when taking multiple supplements.

Who should be cautious

Certain individuals should exercise caution or avoid MSM supplementation:

• Pregnant or breastfeeding women: Safety not established
• People with sulfur sensitivities: May experience allergic reactions
• Those with bleeding disorders: Theoretical increased bleeding risk
• Individuals scheduled for surgery: Discontinue 2 weeks prior
• People with kidney problems: Limited safety data for impaired kidney function

Frequently asked questions

Is MSM the same as sulfur?

MSM is an organic compound that contains sulfur and serves as a bioavailable source of this mineral. While MSM provides sulfur to the body, it’s specifically methylsulfonylmethane, not elemental sulfur.

How long does it take to see benefits from MSM?

Individual responses vary, but joint-related benefits may take 2-6 weeks of consistent use to become apparent. Some people report improvements within days, while others may need longer.

Can I take MSM with other joint supplements?

MSM is commonly combined with glucosamine and chondroitin in joint health formulas. These combinations appear safe, though consulting a healthcare provider is recommended for optimal dosing.

Should MSM be taken with food?

Taking MSM with meals can help reduce potential stomach upset. There’s no evidence that food significantly affects absorption, so timing can be based on personal tolerance.

Is MSM suitable for vegetarians and vegans?

Yes, MSM supplements are typically synthetic and suitable for vegetarians and vegans. However, always check product labels for any animal-derived ingredients in capsules or formulations.