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Doctor's Best vs NOW Foods MSM (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
Doctor's Best takes it on our rubric, 93 to 87 on our 0-100 execution score, and holds our Top Pick badge in the MSM scorecard. Dosing and form ties at a full 25 for both, since each hits the clinically studied dose in two units of the same branded ingredient. Doctor's Best wins the other three pillars: purity verification 22 to 20, value 23 to 20, and transparency 23 to 22. In our view the six-point gap is smaller in practice than it looks, because these are chemically the same material at the same dose; what Doctor's Best actually buys you is three cents a day and a bottle that lasts nearly twice as long.
NOW is a perfectly reasonable purchase if you prefer a tablet or want a smaller commitment. If price is the only thing you care about, neither is our cheapest option: our Best Value badge sits with a third product, a plain MSM powder at about $0.08 a day, if you will trade the branded form for cost. On the underlying question, our profile grades MSM at evidence tier 3 and calls it a reasonable add-on for osteoarthritis rather than a first-line treatment, with modest effect sizes from small trials of variable quality.
Doctor's Best MSM with OptiMSM 1,500 mg
Doctor's Best
NOW Foods MSM 1,500 mg
NOW Foods
Head-to-Head Comparison
| Category | Doctor's Best MSM with OptiMSM 1,500 mg Doctor's Best | NOW Foods MSM 1,500 mg NOW Foods |
|---|---|---|
| Brand Score | 93/100Winner | 87/100 |
| Dosing & Form | 25/25Winner | 25/25 |
| Purity | 22/25Winner | 20/25 |
| Value | 23/25Winner | 20/25 |
| Transparency | 23/25Winner | 22/25 |
| Cost/Day | $0.15Winner | $0.18 |
| Dose/Serving | 1500mg | 1500mg |
| Form | OptiMSM (distillation-purified methylsulfonylmethane) capsule | OptiMSM (methylsulfonylmethane) tablet |
| Third-Party Tested | ✓ Yes | ✓ Yes |
| Proprietary Blend | No | No |
Why This Comparison Matters
Both of these use OptiMSM, the distillation-purified form our profile says most of the clinical trials used, at 1,500mg per unit. Two units a day gets either one to the 3,000mg daily dose most RCTs ran. That makes this an unusually clean matchup: same branded ingredient, same dose, same daily unit count.
The differences are format and packaging. Doctor's Best is a capsule in a 360-count bottle at $26.99, which our notes call a six-month supply at the studied dose. NOW is a tablet in a 200-count bottle at $17.99, NPA GMP audited, with the OptiMSM form specified on the label. Neither carries USP or NSF certification.
On cost, Doctor's Best is about $0.15 per day at 3,000mg and NOW is about $0.18, after what our notes record as a substantial price rise on the NOW product. We scored both on dosing and form, purity verification, value, and label transparency.
Detailed Score Breakdown
Doctor's Best MSM with OptiMSM 1,500 mg
Doctor's Best
Uses OptiMSM - the distillation-purified form used in most clinical trials. 1,500 mg per capsule makes it easy to reach the 3,000 mg/day target.
OptiMSM is GRAS-designated and distillation-purified. GMP certified. No USP or NSF certification on this product, but OptiMSM is the most tested MSM source.
$0.15/day at 3,000 mg - now the cheapest OptiMSM per day in this comparison after category-wide price rises. 360-count bottle lasts 6 months at 2 capsules/day.
Full ingredient disclosure. OptiMSM form clearly stated. No proprietary blends. Clean label with minimal excipients.
OptiMSM at the best price point. 360-count bottle is a 6-month supply at the clinically studied dose. The benchmark MSM product.
NOW Foods MSM 1,500 mg
NOW Foods
Uses OptiMSM at a clinically relevant dose per tablet
NOW Foods is NPA GMP audited. Uses OptiMSM. No USP or NSF certification on this specific product.
$0.18/day at 3,000 mg after a +71% price rise - no longer the cheapest OptiMSM (Doctor's Best now undercuts it at $0.15/day), but still reasonable for the form.
Full disclosure. OptiMSM form specified. Tablet form noted. No proprietary blends. Source clearly identified.
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.
How We Compared These Products
Every product in our database is scored on four equally-weighted pillars: dosing accuracy and form quality, purity verification (third-party testing), cost per clinically effective dose (not cost per pill), and label transparency. Each pillar is worth 25 points for a total of 100.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
Frequently Asked Questions
Do both MSM products use OptiMSM?
Yes. Both use OptiMSM from Bergstrom Nutrition, the distillation-purified form our profile says most of the clinical trials used, at 1,500mg per unit. That is why both score a full 25 on our dosing and form pillar. Neither carries USP or NSF certification on the finished product.
Which MSM is cheaper per day?
Doctor's Best, at about $0.15 per 3,000mg day against NOW at about $0.18. The bottles are $26.99 for 360 capsules and $17.99 for 200 tablets. Our notes record that NOW held the cheaper position until a substantial price rise moved it. Our value pillar scores that 23 to 20.
Does capsule or tablet matter here?
Not for the ingredient, which is identical. Doctor's Best is a capsule and NOW is a tablet, and our notes list the tablet form as a con on the NOW entry purely as a preference item. The practical difference is bottle size: 360 units against 200, which is roughly six months against three and a half at 2 units a day.
More MSM (Methylsulfonylmethane) Comparisons
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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.