Reading a Creatine Label: Purity, Fillers, Servings and Third-Party Testing

What US rules say a label shows

• The nutrition label on a US dietary supplement is called a Supplement Facts panel. [4]
• One serving equals the maximum amount recommended on the label for consumption per eating occasion. [4]
• Dietary ingredients are listed with the amount per serving; for a calcium example FDA guidance says to list the weight of calcium rather than the calcium carbonate it comes from. [4] Whether a creatine label lists grams of creatine or of the creatine compound is not described in the sources we read, so check the wording.
• Binders, excipients and fillers that are not dietary ingredients must be in the ingredient statement. [4]
• Expiration dating is not required on dietary supplement labels, though a firm may include it if supported by valid data. [5] (FDA page dated 2005; check current rules.)
• FDA does not have the authority to approve dietary supplements before they are marketed. [6]

Rules differ in other countries; the EU, UK and Canada are outside this page. See Supplement regulation by country.

A checklist

1. Which form? Monohydrate, HCl, ethyl ester, nitrate and others differ in creatine per gram: 87.9% for monohydrate, 78.2% for HCl and 67.5% for nitrate by molecular weight. [2] See HCl, buffered, ethyl ester, nitrate and other forms.
2. How much creatine per serving, and how big is a serving? Hypothetical example: if a label gives 3 g per serving and a study amount was 5 g, the arithmetic is about 1.7 servings. This is arithmetic, not advice. Study amounts are on creatine amounts in studies.
3. Is it a single ingredient or a blend? In a survey of 175 products on one US marketplace, 29.7% contained functional ingredients and 21.7% were blends of creatine forms. [1] Multi-ingredient products and pre-workout supplements carry the highest contamination risk for athletes, according to a 2026 review. [7] Blend pages: How to evaluate a supplement formula.
4. What else is in it? Look at the ingredient list for fillers, sweeteners and flavors, and for allergens relevant to you.
5. Is there independent testing? Products with third-party testing certifications can help minimize the risk of ingesting contaminated or banned substances, per a 2022 US physician-education article. [8] Such programs are concentrated in Europe, North America and Australia/New Zealand, according to a 2026 review. [9] Programs are described in general on Quality testing and certifications; this page does not name any.
6. Does a purity claim say how it was checked? A claim like "99.9% pure" is a marketing claim unless testing is shown. One review states that monohydrate from one water-based process has been reported as 99.9% pure, while some other sources were reported to contain impurities. [2]

Why labels are not enough

• In one study of 149 samples, 32 were adulterated by chemical analysis. [10]
• A 2025 lab study found creatine up to 99.66% above the label in sports supplements that contained creatine and taurine. [11]
• A 2023 case report involved a creatine supplement that contained an estimated 425,000 IU of vitamin D per serving because of a manufacturing error. [12]