Updated September 2026. This review is for general education and is not personal medical advice.
Optimum Nutrition Micronized Creatine Powder is a straightforward creatine monohydrate product. Its appeal is simple: the brand lists 5 g of creatine monohydrate per serving, and it is designed to mix into a drink or shake. For most shoppers, that makes it an easy benchmark against more expensive or more complicated creatine products.
Where to buy: Check the current price for Optimum Nutrition Micronized Creatine on Amazon (paid link).
What is in it?
The unflavored product is a micronized creatine monohydrate powder. Optimum Nutrition lists 5 g of creatine monohydrate per serving and describes the product as banned-substance tested. Check the current product listing before buying because available sizes, flavors, and pricing can change.
What we like
- Evidence-aligned ingredient: creatine monohydrate is the form with the strongest research base for repeated high-intensity exercise.
- Clear serving: the brand lists 5 g per serving.
- Simple format: the unflavored powder can be used on its own or mixed into a shake.
- Good value to compare: the direct product page currently shows a lower cost per serving than many premium options.
What to consider
- The product is a plain creatine powder; people seeking a sport-specific third-party certification may prefer a product with that certification clearly listed.
- Micronized describes particle size and mixability—it does not make a product automatically more effective than other creatine monohydrate powders.
- Creatine can increase water retention and can cause digestive discomfort for some people.
Key Score™
- Evidence: 9.5/10
- Formula & dose: 9.0/10
- Testing & transparency: 8.0/10
- Value: 8.0/10
Key Score: 8.4/10 — Very Good.
Best for: Shoppers who want a mainstream, simple 5 g creatine monohydrate powder to compare on price and convenience.
Main drawback: The available testing claim is not the same as a clearly displayed sport-certification listing, so competitive athletes should verify current certification needs before buying.
How it compares
Compared with Thorne Creatine, Optimum Nutrition is the more value-oriented option. Thorne carries an NSF Certified for Sport® listing, while Optimum Nutrition’s product page describes its powder as banned-substance tested. Both list 5 g of creatine monohydrate per serving, so the choice often comes down to budget, testing preference, and the specific product listing.
For our complete ranking framework, see Best Creatine Supplements of 2026.
Bottom line
Optimum Nutrition Micronized Creatine is a strong value-focused option to compare if you want an uncomplicated creatine monohydrate product. It is not a replacement for training, nutrition, or medical advice. Speak with a clinician before using creatine if you have a medical condition, take medications, are pregnant, or have kidney-related concerns.
Source checks: Optimum Nutrition product page and NIH Office of Dietary Supplements: Exercise and Athletic Performance.