The best-selling creatine on Amazon, and our default recommendation. Pure monohydrate, honest label, enormous track record. Here is the full assessment.
If you want one creatine to buy without overthinking, this is it. One ingredient, one honest 5 g serving (one rounded teaspoon), micronized for easy mixing, from a manufacturer with decades in sports nutrition. It is the product we recommend first on this site, and the one our quiz matches to most goals.
Optimum Nutrition Micronized Creatine Monohydrate is an unflavored creatine powder. Each serving delivers 5 g of creatine monohydrate, and the 120-serving tub contains 600 g total. The ingredient list is exactly one line: creatine monohydrate. The powder is micronized, meaning the particles are milled finer than standard creatine, which helps it dissolve instead of settling at the bottom of your glass. The manufacturer, Glanbia Performance Nutrition, also makes the long-running Optimum Nutrition Gold Standard whey line.
On Amazon it consistently ranks at or near the top of the creatine category, with tens of thousands of customer ratings on its listings (one size variant showed about 79,000 ratings when checked 2026-10-03; the product page dates to 2003). Popularity is not proof of quality, but two decades of it is worth noting.
The label is the whole pitch: 5 g of creatine monohydrate per serving, no blends, no fillers, no added anything. That is exactly what the research literature studies, which means every dosing protocol on this site maps to this product gram for gram. Micronization is a real, practical upgrade over gritty generic powders. And because it is unflavored, it disappears into water, juice, smoothies, or oatmeal without changing the taste.
Almost everyone starting creatine: first-timers who want the standard protocol without decisions, women following our midlife guide, lifters who want a no-nonsense staple, and anyone using higher brain-focused doses who needs precise measurement. If your goal is "give me the studied dose in the simplest form," this is the answer.
Competitive athletes subject to drug testing should choose an NSF Certified for Sport option like Momentous Creatine instead. If you know you will not stick with a powder routine, be honest with yourself and read our gummies comparison first.
Mix one rounded teaspoon (5 g, the label's serving size; no scoop is included) into 8 to 12 ounces of water, juice, or your shake, once daily. For the loading protocol, that is four servings spread through the day for 5 to 7 days. Take it at whatever time you will remember. For exact grams, weigh the powder on a kitchen scale: a spoon measures volume, not weight. Full details in the dosing guide.
Our reviews are editorial assessments based on label transparency (exact creatine content, no proprietary blends), third-party certifications where present, the manufacturer's track record, and how well the product maps to published dosing research. We do not claim personal laboratory testing. Research-based assessment; not independently lab tested. See our full methodology in the disclosure.
This review summarizes label facts and published research for information purposes. Talk to your doctor before starting any supplement.