Thorne vs Optimum Nutrition Creatine in the UK (2026): Same Molecule
Prices and cost per day here are from our US catalogue in USD. UK prices differ — use them to compare products with each other, not to budget in pounds. Buy buttons open the product on Amazon.co.uk; where a brand is not sold in the UK, the button opens an Amazon.co.uk search instead of a dead page.
Same molecule, different certification tier. Both are creatine monohydrate at the researched 5g dose — Thorne ($0.49/day) is NSF Certified for Sport; Optimum Nutrition ($0.30/day) is micronised and Banned Substance Tested, at a lower cost per day. You're not paying Thorne's premium for more effect — you're paying for certification.
Informational comparison of label data and cost — not medical advice. Consult your doctor before starting creatine if you have kidney disease or another condition affecting kidney function. Prices are per-serving figures at the price when checked; certifications are each brand's published claim.
The numbers, side by side
| Per serving | Thorne Creatine | Optimum Nutrition Micronized |
|---|---|---|
| Form | Micronized creatine monohydrate | Micronized creatine monohydrate |
| Dose | 5g (1 scoop) | 5g (1 scoop) |
| Servings/container | 90 | 60 |
| Certification | NSF Certified for Sport | Banned Substance Tested |
| Purity note | German-manufactured, 99.99% pure | Micronized (finer powder, easier mixing) |
| Price | $44.00 | $17.97 |
| Cost / day (5g) | $0.49 | $0.30 |
| Buy | Check price → | Check price → |
Prices are Amazon buy-box figures from our last price check (as of September 29, 2026) divided by pack serving count; they move. Purity/certification claims are each brand's published label.
The real difference: certification tier, not efficacy
Both products are plain creatine monohydrate at the same 5g daily dose — the form behind essentially all of the 500+ studies on creatine, and the one the International Society of Sports Nutrition position stand names as the most effective and best-studied form available (Kreider 2017, PMID 28615996). No alternative form, and no particular brand of monohydrate, has been shown to build more muscle or strength than another — they're the same active molecule. That means the gap between these two products isn't performance, it's sourcing and certification.
Thorne's premium buys one specific thing: NSF Certified for Sport, an every-batch third-party programme that screens for banned substances — the kind of certification tested athletes and competitive organisations often require. Optimum Nutrition's label states Banned Substance Tested, its own claim, and the product is micronised (ground finer for easier mixing), but it doesn't carry NSF's specific every-batch programme. That difference doesn't change what the creatine does once you take it; it adds real cost to certify.
Who each one is for
Choose Thorne if you compete in a tested sport, belong to an organisation that requires NSF Certified for Sport, or simply want the added assurance of a strict every-batch third-party programme.
Choose Optimum Nutrition if you're a recreational lifter with no testing requirement — you get the identical monohydrate molecule and identical results at a lower cost per day.
Skip both if you're chasing a "better form" instead — HCl, buffered, or ethyl ester creatine haven't outperformed monohydrate in head-to-head research. See monohydrate vs HCl for why plain monohydrate keeps winning.
Our picks
Micronized creatine monohydrate, NSF Certified for Sport. $0.49/day.
Micronized monohydrate, Banned Substance Tested. $0.30/day.
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The evidence · Creatine
What the published reviews of Creatine concluded
- Effect of creatine supplementation on kidney function: a systematic review and meta-analysis. · BMC nephrology, 2025
“Creatine supplementation is associated with a modest, transient increase in serum creatinine levels, likely due to metabolic turnover rather than renal impairment. No significant changes were observed in GFR, suggesting preserved kidney function.”
- Creatine supplementation protocols with or without training interventions on body composition: a GRADE-assessed systematic review and dose-response meta-analysis. · Journal of the International Society of Sports Nutrition, 2024
“Creatine supplementation has a small effect on body mass and estimates of fat-free mass and body fat percentage. These findings were more robust when combined with resistance training.”
- The Paradoxical Effect of Creatine Monohydrate on Muscle Damage Markers: A Systematic Review and Meta-Analysis. · Sports medicine (Auckland, N.Z.), 2022
“Overall, our meta-analysis demonstrated a paradoxical effect of CrM supplementation post-exercise, where CrM appears to minimise exercise-induced muscle damage as an acute training response, although this trend is reversed as a chronic training response.”
- Effects of creatine supplementation on muscle strength gains-a meta-analysis and systematic review. · PeerJ, 2025
“Cr supplementation significantly improves muscle strength in the general population.”
Method: PubMed searched in humans for systematic reviews and meta-analyses with Creatine in the title; these 4 of the 29 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Creatine will work for you — each of these reports an average across trials published 2022–2025, and null findings are shown here as readily as positive ones.
Frequently asked questions
Is Thorne creatine better than Optimum Nutrition?
Not in effectiveness — both are monohydrate at the same 5g dose, the form the ISSN names most effective and best-studied regardless of brand. Thorne adds NSF Certified for Sport; ON is micronised and Banned Substance Tested. You're paying for certification, not extra results.
Why is Thorne creatine so much more expensive?
About $0.49/day vs $0.30 (US catalogue prices in USD) — the gap tracks NSF Certified for Sport, an every-batch third-party programme. It doesn't change how the creatine performs; it adds real cost to certify.
Do I need NSF Certified for Sport creatine?
Only if you compete in a tested sport or want that added assurance. Recreational lifters get the identical molecule and results from a non-certified monohydrate like Optimum Nutrition's, at a lower cost per day.
Is Optimum Nutrition creatine pure enough?
Its label says Banned Substance Tested, which we could not verify in a registry. It is micronised creatine monohydrate, the same active ingredient behind the research base. It lacks Thorne's NSF programme, but the core molecule's purity isn't in question.
Related
- Monohydrate vs HCl vs Gummies — why monohydrate beats every alternative form
- Best creatine for muscle growth — the hypertrophy evidence and realistic gains
- Creatine dosage & loading guide — how much, timing, and why you shouldn't cycle
Sources
- Kreider RB, et al. "International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine." J Int Soc Sports Nutr. 2017;14:18. PMID: 28615996
- Product labels: Thorne Creatine, Optimum Nutrition Micronized Creatine Monohydrate, manufacturer label data, July 2026.