MSM — The Organic Sulfur Donor

Methylsulfonylmethane (MSM) is an organosulfur compound that acts as a sulfur donor for the synthesis of methionine and cysteine, crucial for glutathione production and collagen cross-linking. It exerts anti-inflammatory effects by inhibiting the NF-κB signaling pathway, thereby reducing the expression of pro-inflammatory cytokines such as IL-1β, IL-6, and TNF-α. MSM also decreases oxidative stress by modulating the Nrf2 pathway, enhancing the body's endogenous antioxidant capacity. Its role in longevity is primarily linked to mitigating inflammaging and supporting connective tissue integrity.

Multiple human clinical trials have investigated MSM, primarily for osteoarthritis and joint pain. A 12-week randomized controlled trial (2011) found that 3.375 g/day of MSM improved pain and physical function in patients with knee osteoarthritis. Another trial (2023) showed that 2 g/day improved knee quality of life in healthy participants with mild knee pain. There are no published human longevity trials.

1,000–3,000 mg/day is the most commonly studied and used range for general anti-inflammatory and joint support. Doses up to 4,000–6,000 mg/day have been used in clinical trials, typically divided into two or three doses. Best taken with water.

MSM is generally recognized as safe (GRAS) and well-tolerated at doses up to 4 grams daily. Mild side effects may include gastrointestinal upset, bloating, or diarrhea, particularly at higher doses. There are no major known drug interactions, but individuals with a history of sulfur sensitivity or those taking blood-thinning medications should consult a physician before use.

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