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MSM (Methylsulfonylmethane)
Bottom line
In our scoring, MSM (Methylsulfonylmethane) rates mixed evidence: the evidence is mixed for osteoarthritis pain and physical function. Our top-scored product is Doctor's Best MSM with OptiMSM 1,500 mg (93/100), about $0.15 a day at a clinical dose of 1,500-6,000 mg daily, split into 2-3 doses. Bottom line: promising but not settled, so manage expectations. This is our opinion, not medical advice; talk to your clinician before starting.
MSM is a reasonable add-on for osteoarthritis, not a first-line treatment, but better-supported than most joint supplements.
- Evidence
- Mixed Evidence
- Category
- Joint & Bone Health
- Best form
- OptiMSM (distillation-purified, most studied)
- Effective dose
- 1,500-6,000 mg daily, split into 2-3 doses
- Lab tested
- 8 of 10 products
- Category
- Joint & Bone Health
- Best form
- OptiMSM (distillation-purified, most studied)
- Effective dose
- 1,500-6,000 mg daily, split into 2-3 doses
- Lab tested
- 8 of 10 products
Key takeaways
- →Modest but real evidence for osteoarthritis: 3,000-6,000mg/day over 12 weeks consistently improves pain and function vs. placebo.
- →Standard dose is 3,000mg/day split into 2-3 doses with meals; OptiMSM (the form used in most RCTs) is worth seeking out over generic crystallized MSM.
- →Doctor's Best with OptiMSM ($0.15/day, 6-month bottle) is the top pick and now also the cheapest OptiMSM per day; BulkSupplements MSM powder ($0.08/day) is the best value if you will trade the branded form for price.
- →Excellent safety; mild GI distress at higher doses. Sulfa drug allergies do NOT cross-react with MSM despite the similar name.
What Is MSM (Methylsulfonylmethane)?
MSM is a reasonable add-on for osteoarthritis, not a first-line treatment, but better-supported than most joint supplements. Trials using 3,000-6,000mg/day for 12 weeks consistently show small-to-moderate improvements in OA pain and physical function versus placebo, though sample sizes are small and trial quality is variable. It will not replace physical therapy or weight management, and the evidence for exercise recovery and inflammation is thinner. OptiMSM is the distillation-purified form used in most of the studies.
The strongest data comes from osteoarthritis. Trials using 3,000-6,000mg/day MSM for 12 weeks consistently show significant improvements in pain and physical function compared to placebo. A pooled analysis of these and smaller trials concludes there is a small-to-moderate benefit for OA pain, though trial quality is variable and sample sizes are small.
For exercise-induced muscle damage, a handful of RCTs suggest MSM may reduce post-exercise soreness and inflammatory markers. Withee et al. (2017) found that 3,000 mg/day MSM for 28 days reduced muscle soreness after a half-marathon. Barmaki et al. (2012) reported similar findings in trained athletes. These are interesting but the trials are small and the effect sizes are not dramatic.
The anti-inflammatory mechanism is plausible. MSM appears to inhibit NF-kB signaling and reduce pro-inflammatory cytokines in cell and animal studies. Butawan et al. (2017) published a useful review of these pathways. However, the clinical translation of "reduces CRP" into meaningful patient outcomes is still thin.
One area worth noting: Barrager et al. (2002) ran a small RCT on allergic rhinitis and found 2,600 mg/day MSM improved upper respiratory symptoms compared to placebo. Interesting, but never replicated.
The honest assessment: MSM is one of the better-tolerated joint supplements on the market with a clean side effect profile and some genuine RCT support. But the evidence base is limited by small sample sizes, and the effect sizes are modest. It is not a replacement for physical therapy or weight management in osteoarthritis, but it is a reasonable add-on. The branded OptiMSM form is distillation-purified and is what most clinical studies have used.
Does It Work? The Evidence
How A-F grades workMSM (Methylsulfonylmethane) earns a Mixed Evidence rating: the research is suggestive but not settled. Its best-supported use so far is osteoarthritis pain and physical function (grade B), but the evidence across claims is mixed - each is graded on its own below.
Osteoarthritis pain and physical function
Kim et al. 2006 RCT (n=50, 6g/day); Debbi et al. 2011 RCT (n=49, 3.375g/day); 2017 meta-analysis of OA trials
Exercise-induced muscle soreness and recovery
Withee et al. 2017 (3g/day, half-marathon runners); Barmaki et al. 2012 (trained athletes)
Systemic inflammation reduction (CRP, cytokines)
Butawan et al. 2017 review of anti-inflammatory mechanisms; mostly cell/animal data with limited clinical confirmation
Allergic rhinitis symptom relief
Barrager et al. 2002 RCT (n=55, 2.6g/day) - single unreplicated trial
Skin and hair health
Limited human data; sulfur is a structural component of keratin but clinical trials on MSM for skin/hair are sparse
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| B | Osteoarthritis pain and physical function | Kim et al. 2006 RCT (n=50, 6g/day); Debbi et al. 2011 RCT (n=49, 3.375g/day); 2017 meta-analysis of OA trials | Supported |
| C | Exercise-induced muscle soreness and recovery | Withee et al. 2017 (3g/day, half-marathon runners); Barmaki et al. 2012 (trained athletes) | Early Signal |
| C | Systemic inflammation reduction (CRP, cytokines) | Butawan et al. 2017 review of anti-inflammatory mechanisms; mostly cell/animal data with limited clinical confirmation | Early Signal |
| D | Allergic rhinitis symptom relief | Barrager et al. 2002 RCT (n=55, 2.6g/day) - single unreplicated trial | Not There Yet |
| D | Skin and hair health | Limited human data; sulfur is a structural component of keratin but clinical trials on MSM for skin/hair are sparse | Not There Yet |
How to Choose: Forms, Doses & What Matters
Clinical dose: 1,500-6,000 mg daily, split into 2-3 doses; most RCTs use 3,000 mg/day
Best forms: OptiMSM (distillation-purified, most studied), crystalline MSM powder, MSM capsules/tablets
Take 1,500-3,000 mg twice daily with meals (total 3,000-6,000 mg/day). Starting at the lower end and increasing gradually may reduce the chance of GI discomfort. Most clinical studies dosed MSM for at least 12 weeks before assessing outcomes, so allow 8-12 weeks for effects on joint symptoms. MSM can be taken as capsules, tablets, or powder mixed into water or a beverage - the powder has a mildly bitter taste. It pairs well with glucosamine sulfate (1,500 mg/day) and chondroitin sulfate (1,200 mg/day) for comprehensive joint support. No specific timing requirements - morning or evening is fine.
Who Should Take MSM (Methylsulfonylmethane)?
Adults with mild-to-moderate osteoarthritis looking for a supplement to complement their treatment plan. People experiencing exercise-induced muscle soreness or joint stiffness from regular training. Those already taking glucosamine who want an additional joint support compound - MSM is often combined with glucosamine and chondroitin, and some evidence suggests the combination may be more effective than either alone. MSM is also reasonable for people who have tried glucosamine and did not tolerate it, since MSM has a very mild side effect profile.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
10 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 10 Products Compared
Doctor's Best MSM with OptiMSM 1,500 mg
Doctor's Best$26.99 ÷ 180 days at 3000mg/day (2 servings × 1500mg)
OptiMSM at the best price point. 360-count bottle is a 6-month supply at the clinically studied dose. The benchmark MSM product.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
NOW Foods MSM 1,500 mg
NOW Foods$17.99 ÷ 100 days at 3000mg/day (2 servings × 1500mg)
Was the cheapest OptiMSM per dose until the 2026 price rise; Doctor's Best now beats it per day. NOW Foods has a solid reputation for consistent quality at low prices.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
Pure Encapsulations MSM capsules
Pure Encapsulations$79.50 ÷ 102 days at ~3002mg/day (3.5 servings × 850mg)
The premium choice for people with multiple food sensitivities. Excellent quality, but you are paying roughly 5x more per dose than the cheapest comparable OptiMSM product.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
BulkSupplements.com MSM Powder
BulkSupplements
$27.97 ÷ 350 days at ~2860mg/day (2.9 servings × 1000mg)
Unbeatable price if cost is your top priority. But the lack of branded MSM source and named third-party testing means you are trusting BulkSupplements' internal QC.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
Jarrow Formulas MSM 1,000 mg
Jarrow Formulas$22.96 ÷ 68 days at 3000mg/day (3 servings × 1000mg)
Solid OptiMSM product but the 1,000 mg dose means you burn through the bottle faster, and the 2026 price jump makes that math sting. Good for people who want flexible dosing.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
Nature's Way MSM 1,000 mg
Nature's Way
$17.99 ÷ 67 days at 3000mg/day (3 servings × 1000mg)
Reliable brand, but after the 2026 price rise it does not offer a competitive price-to-value ratio in this category.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
Doctor's Best Glucosamine Chondroitin MSM with OptiMSM
Doctor's Best$32.99 ÷ 60 days at 1000mg/day (1 serving × 1000mg)
Convenient triple combo for joint support, but the MSM is underdosed at 1,000 mg/day - only 1/3 of the dose used in standalone MSM trials - and the 2026 price jump erodes the convenience case.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
NOW Foods MSM 1,000 mg
NOW Foods$20.30 ÷ 81 days at 3000mg/day (3 servings × 1000mg)
Once the budget option, but at $0.25/day for generic MSM it is now more expensive per day than Doctor's Best branded OptiMSM - in our view there is no longer a price case for it. For a branded ingredient with documented purification, look at the Doctor's Best option.
Prices checked 2026-06-11. Cost shown is per clinically effective daily dose, not per pill.
Spring Valley MSM 1,000 mg
Spring Valley$8.47 ÷ 40 days at 3000mg/day (3 servings × 1000mg)
Store brand with no third-party testing and no branded MSM source. The savings are real but so is the uncertainty about what you are getting.
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Zenwise MSM + Glucosamine Joint Support Complex
Zenwise
$12.97 ÷ 30 days at 0mg/day (3 servings × 0mg)
A proprietary blend that hides every ingredient amount. You have no way to know if the MSM dose is 50 mg or 500 mg. This is the type of product this site exists to call out.
Prices checked 2026-04-01. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Doctor's Best MSM with OptiMSM 1,500 mg Doctor's Best | NOW Foods MSM 1,500 mg NOW Foods | Pure Encapsulations MSM capsules Pure Encapsulations | BulkSupplements.com MSM Powder BulkSupplements | Jarrow Formulas MSM 1,000 mg Jarrow Formulas | Nature's Way MSM 1,000 mg Nature's Way | Doctor's Best Glucosamine Chondroitin MSM with OptiMSM Doctor's Best | NOW Foods MSM 1,000 mg NOW Foods | Spring Valley MSM 1,000 mg Spring Valley | Zenwise MSM + Glucosamine Joint Support Complex Zenwise |
|---|---|---|---|---|---|---|---|---|---|---|
| Brand Score | 93/100Winner | 87/100 | 79/100 | 77/100 | 74/100 | 73/100 | 71/100 | 65/100 | 60/100 | 47/100 |
| Dosing & Form | 25/25Winner | 25/25 | 18/25 | 18/25 | 18/25 | 18/25 | 18/25 | 14/25 | 14/25 | 16/25 |
| Purity | 22/25 | 20/25 | 23/25Winner | 17/25 | 20/25 | 19/25 | 20/25 | 17/25 | 13/25 | 13/25 |
| Value | 23/25 | 20/25 | 13/25 | 25/25Winner | 14/25 | 16/25 | 13/25 | 17/25 | 18/25 | 9/25 |
| Transparency | 23/25 | 22/25 | 25/25Winner | 17/25 | 22/25 | 20/25 | 20/25 | 17/25 | 15/25 | 9/25 |
| Cost/Day | $0.15 | $0.18 | $0.78 | $0.08Winner | $0.34 | $0.27 | $0.55 | $0.25 | $0.21 | $0.43 |
| Dose/Serving | 1500mg | 1500mg | 850mg | 1000mg | 1000mg | 1000mg | 1000mg | 1000mg | 1000mg | 0mg |
| Form | OptiMSM (distillation-purified methylsulfonylmethane) capsule | OptiMSM (methylsulfonylmethane) tablet | OptiMSM (methylsulfonylmethane) hypoallergenic capsule | methylsulfonylmethane powder (purification method unspecified) | OptiMSM (methylsulfonylmethane) veggie capsule | OptiMSM (methylsulfonylmethane) tablet | OptiMSM + glucosamine sulfate + chondroitin sulfate capsule | methylsulfonylmethane veg capsule | methylsulfonylmethane capsule (source and purification unspecified) | proprietary blend capsule (MSM amount undisclosed) |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | ✓ Yes | No | No |
| Proprietary Blend | No | No | No | No | No | No | No | No | No | Yes |
Frequently Asked Questions
Is MSM the same as sulfur? Will it cause a reaction if I have a sulfa drug allergy?
No. MSM contains sulfur as an element, but it is not related to sulfonamide antibiotics (sulfa drugs) or sulfite preservatives. These are chemically distinct compounds. A sulfa drug allergy does not mean you will react to MSM. The confusion comes from the shared word root, but there is no cross-reactivity. That said, if you have concerns, discuss with your doctor before starting.
What is OptiMSM and is it worth paying more for?
OptiMSM is a branded form of MSM manufactured by Bergstrom Nutrition using a proprietary distillation purification process. It is the form used in most published clinical trials. Distillation-purified MSM is considered purer than crystallization-purified MSM, which may contain residual solvents. If you want the form closest to what was actually studied, OptiMSM is the better choice. The price premium is usually modest - a few dollars more per bottle.
Should I take MSM with glucosamine and chondroitin?
The combination is common and has some rationale. A 2004 pilot study by Usha and Naidu found that glucosamine plus MSM improved pain and swelling scores more than either alone in knee osteoarthritis patients. However, the data on the triple combination (glucosamine + chondroitin + MSM) is limited. If you are already taking glucosamine sulfate and getting some benefit, adding MSM at 3,000 mg/day is a reasonable and low-risk addition.
How long does MSM take to work?
Most clinical trials assessed outcomes after 12 weeks of daily use. Some participants reported improvements in joint pain as early as 4-6 weeks, but the full effect appears to build over time. If you have been taking MSM at an adequate dose (3,000 mg/day or more) for 12 weeks with no noticeable benefit, it is reasonable to discontinue.
Is MSM powder or capsule form better?
Bioavailability is the same. Powder is typically cheaper per gram and allows flexible dosing, but it has a mildly bitter taste that some people dislike. Capsules are more convenient and taste-neutral but cost more per dose due to encapsulation. Choose based on your preference and budget.
Can I take MSM long-term?
The safety data is reassuring but limited in duration. Clinical trials have run up to 6 months without serious adverse effects. Many people take MSM continuously for years, and no long-term safety signals have emerged from post-market surveillance. However, there are no multi-year RCTs. Given the excellent tolerability profile, long-term use at standard doses (3,000-6,000 mg/day) appears reasonable.
Related Articles
Sources
- Kim LS, et al. Efficacy of methylsulfonylmethane (MSM) in osteoarthritis pain of the knee: a pilot clinical trial. Osteoarthritis Cartilage. 2006;14(3):286-294.
- Debbi EM, et al. Efficacy of methylsulfonylmethane supplementation on osteoarthritis of the knee: a randomized controlled study. BMC Complement Altern Med. 2011;11:50.
- Butawan M, Benjamin RL, Bloomer RJ. Methylsulfonylmethane: Applications and Safety of a Novel Dietary Supplement. Nutrients. 2017;9(3):290.
- Withee ED, et al. Effects of Methylsulfonylmethane (MSM) on exercise-induced oxidative stress, muscle damage, and pain following a half-marathon: a double-blind, randomized, placebo-controlled trial. J Int Soc Sports Nutr. 2017;14:24.
- Barrager E, Veltmann JR Jr, Schauss AG, Schiller RN. A multicentered, open-label trial on the safety and efficacy of methylsulfonylmethane in the treatment of seasonal allergic rhinitis. J Altern Complement Med. 2002;8(2):167-173.
- Usha PR, Naidu MUR. Randomised, Double-Blind, Parallel, Placebo-Controlled Study of Oral Glucosamine, Methylsulfonylmethane and their Combination in Osteoarthritis. Clin Drug Investig. 2004;24(6):353-363.
- Barmaki S, et al. Effect of methylsulfonylmethane supplementation on exercise-induced muscle damage and total antioxidant capacity. J Sports Med Phys Fitness. 2012;52(2):170-174.
- NIH National Center for Complementary and Integrative Health. Methylsulfonylmethane (MSM): What You Need to Know.
Scores and tiers are our independent opinion, formed by applying a published rubric to label data, third-party certifications, and the research record. They are not statements of objective fact about a product and not a lab test. Where we report a brand-specific fact, it comes from a cited source or a public certification; where verification is missing, we say so rather than assume a result.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.