Optimum Nutrition Micronized Creatine Review

Optimum Nutrition Micronized Creatine: The Industry Standard

Optimum Nutrition (ON) has been selling creatine since the 1990s, and their Micronized Creatine Monohydrate remains one of the best-selling creatine products worldwide. It's the product most gym-goers reach for by default — and for good reason. It's simple, effective, affordable, and backed by Informed Sport certification.

We used ON Micronized Creatine daily for 8 weeks across two testers to evaluate real-world performance.

What's Inside

The ingredient list is exactly what you want: creatine monohydrate. That's it. No fillers, no flavors, no additives. The micronized processing means the powder particles are smaller than standard creatine, which improves mixability and reduces the gritty texture that plagues some creatine products.

ON sources their creatine monohydrate (not Creapure, but their own quality-controlled supply chain) and processes it to pharmaceutical-grade standards. The product carries Informed Sport certification, meaning every batch is tested for banned substances and label accuracy.

Mixability & Taste

ON Micronized Creatine dissolves well in cold water — not perfectly (no creatine does), but significantly better than non-micronized alternatives. In 8-12oz of cold water, about 90% dissolves with moderate stirring. The rest settles quickly, so we recommend drinking it promptly after mixing.

Taste: essentially nothing. Unflavored creatine monohydrate has a very faint mineral taste that's virtually undetectable in water and completely undetectable in protein shakes, juice, or smoothies.

Performance

Over 8 weeks of consistent use (5g/day) alongside a structured training program, both testers experienced the expected creatine benefits:

• Increased training volume — 2-3 additional reps on compound lifts by week 4
• Faster recovery between sets — especially noticeable on high-volume training days
• Modest weight gain (2-3 lbs) from creatine-associated water retention — expected and normal
• Subjectively improved endurance during HIIT sessions

These results are consistent with the established clinical literature on creatine monohydrate and not specific to ON's product — any quality creatine monohydrate at 5g/day should produce similar results.

Value

At approximately $0.25 per 5g serving (prices vary by retailer), ON Micronized Creatine is well-priced for a certified product. It's not the cheapest creatine available, but the Informed Sport certification adds value for athletes who need to verify what's in their supplements. Bulk options (120 servings) bring the per-serving cost even lower.

How It Compares

• vs. Thorne: ON is cheaper ($0.25 vs $0.36/serving) but uses standard monohydrate vs. Creapure, and Informed Sport vs. NSF Certified for Sport. Both are excellent — Thorne edges it on purity certification.
• vs. Naked Creatine: ON costs more ($0.25 vs $0.15) but offers Informed Sport certification that Naked doesn't have.
• vs. Transparent Labs: ON is simpler (creatine only vs. creatine + HMB + Vitamin D). Choose ON for pure creatine, TL for an enhanced formula.

Who This Is For

• Anyone who wants reliable, certified creatine at a fair price
• Gym-goers who want unflavored creatine to mix into existing drinks
• Athletes who need Informed Sport certification for compliance
• People new to creatine who want a trusted, mainstream brand