If creatine monohydrate had a default setting, it would look a lot like this tub. Optimum Nutrition’s Micronized Creatine Monohydrate Powder is unflavored, single-ingredient, and dosed at 5 grams per serving — and it has been one of the best-selling creatines on Amazon for years. It sits in ON’s “Gold Standard” sports nutrition line, is made by Glanbia Performance Nutrition, and the product identifiers note banned-substance testing.
This review breaks down what is actually in the tub, what buyers consistently praise, and the complaints that keep showing up — so you can decide whether the gold standard label still means anything in 2026.
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| Product at a Glance | |
|---|---|
 | Optimum Nutrition Micronized Creatine Monohydrate Powder, Unflavored The long-running default pick for plain creatine monohydrate — one ingredient, 5 grams per serving, no flavors or extras. |
| Key specs |
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| Best for | Lifters who want a simple, well-established, inexpensive creatine monohydrate and don’t care about flavors or extras. |
| Check Price on Amazon | |
What Optimum Nutrition Claims
ON markets this as a straightforward performance staple. The brand says the formula is designed to support explosive movements, delivers 5 grams of creatine per serving, and belongs to the company’s “Gold Standard” line — the same branding as its famous whey protein. These are marketing claims rather than independent findings, but they tell you how ON wants the product understood: no frills, just creatine.
Inside the Tub: A One-Ingredient Formula
The ingredient list is exactly one item long: creatine monohydrate. Each serving delivers 5 grams, the standard daily maintenance dose used across most creatine research and the amount most lifters settle on for the long term. The 600-gram tub holds 120 servings, and 60-serving and 240-serving sizes exist for smaller or larger commitments. The powder is micronized — milled finer than standard creatine — which is supposed to help it mix better, and it is unflavored, so it adds no taste of its own to water, juice, or a shake.
The Dissolve Question
Here is the complaint that never quite goes away: micronized or not, this creatine does not fully dissolve in cold water. Stir it into a glass and fine sediment will settle at the bottom if you let it sit. It is not a dealbreaker — most people just stir and drink quickly, or mix it into a shake where the texture disappears — but if you expect it to vanish like sugar, reset that expectation. Warm liquid helps; vigorous stirring is the real fix.
What Buyers Like
- The single-ingredient formula at 5 grams per serving is the standard maintenance dose — there is nothing to decode on the label.
- Track record: this has been one of the best-selling creatines on Amazon for years. That kind of longevity means the manufacturing kinks were worked out long ago.
- Low price per serving. Creatine monohydrate is already one of the cheapest supplements you can buy per serving, and ON’s scale keeps this tub competitive.
Honest Complaints
- Mixing: as covered above, it does not fully dissolve in cold water without a good stir.
- The scoop is often buried in the powder on first opening. Nearly every tub of powdered supplement has this issue, and this one is no exception — keep a clean utensil handle handy for the first dig.
- Some users report bloating or water retention, especially during a loading phase. Creatine draws water into muscle tissue — part of how it works — but the sensation bothers some people, particularly at higher loading doses.
Red Flags and Safety Notes
- Talk to a healthcare professional before using creatine if you are pregnant, nursing, managing a medical condition, or taking medication.
- Creatine increases water retention — drink plenty of water through the day, especially around workouts.
- This is an adult supplement and is not intended for children.
- You do not need a loading phase: 5 grams per day reaches full muscle saturation on its own within a few weeks.
- Do not combine with unknown stimulants, and do not exceed the dose on the label.
How to Use It
Most people take 5 grams once a day, stirred into water, juice, or a protein shake. Timing is not critical — taking it consistently matters far more than whether it lands pre- or post-workout. And because a 5-gram daily dose saturates muscles without loading, you can skip the 20-gram loading weeks entirely.
The Verdict
Optimum Nutrition’s creatine is popular for a simple reason: it is creatine monohydrate, dosed correctly, from a manufacturer with a long track record, at a low price per serving. It will not dissolve perfectly, and the scoop will play hide-and-seek in a fresh tub, but neither issue changes what is in the powder. If you want flavored or “advanced” creatine blends, look elsewhere. If you want the standard, this is the standard.
Frequently Asked Questions
How much creatine is in each serving?
5 grams of creatine monohydrate per serving — the standard daily maintenance dose.
Does ON creatine need a loading phase?
No. A 5-gram daily dose reaches full muscle saturation within a few weeks on its own, so you can skip loading entirely.
Does it dissolve well in water?
Not completely. Micronized creatine mixes better than standard creatine, but it still leaves fine sediment in cold water unless you stir well.
ON vs. Nutricost creatine — which is better?
Both are popular micronized creatine monohydrates. ON is the longer-established name with a longer sales history, while Nutricost is another well-known budget option. Compare serving size, servings per tub, and price per serving when you shop.
Conclusion
Creatine is one of the simplest supplements to buy well: pick monohydrate, pick 5 grams, pick a maker you trust. Optimum Nutrition checks all three boxes, which is why this tub has stayed near the top of the category for so long.
