Creatine Products, Contamination and Banned Substances in Sport Supplements

How the evidence is labeled

Evidence in adequately nourished people is not used here, because these are product-testing studies. Mixed means findings differ by product type. Insufficient evidence means too few creatine-specific data. Proper evidence not found means we looked and found nothing usable.

What the surveys found

A 2022 critical review (authors with industry ties) says that creatine monohydrate from some sources has been reported to contain manufacturing contaminants such as dicyandiamide and thiourea, and higher levels of heavy metals. [4] We did not read the original reports behind that statement.

Which sport products carry more risk

A 2026 review of the unintentional-doping literature found contamination risk varies, and is highest for multi-ingredient products, preworkout supplements, weight-loss products and muscle-building products. [5] A 2026 global review also lists herbal blends, preworkouts and weight-management supplements as high-risk in all regions. [6] Creatine blended into those products takes on their risks, so a single-ingredient product and a multi-ingredient blend are different questions.

Doping rules

A 2017 position stand said creatine is found in the food supply and its use is not banned by any sport organization. [7] That is a 2017 statement, and rules change, so check the current rules of your sport. The reviewers still describe inadvertent anti-doping violations from contamination and mislabeling as a real concern for athletes. [5]

Third-party testing

The 2026 global review says third-party testing programs, which independently verify products for prohibited substances, are concentrated in Europe, North America, and Australia and New Zealand, and that most countries lack harmonized or enforceable safety frameworks. [6] The unintentional-doping review lists third-party certification and product verification among risk-reduction steps. [5] Certification is not a guarantee. See quality testing and certifications and sports certification.

What we could not find

Proper evidence not found for a survey that tested creatine products alone for banned steroids. We searched PubMed for creatine with contamination, adulteration and anti-doping terms. The "DHT" hair-loss claim is a hormone question, not a contamination question; see creatine and hair loss.

Practical safety points

Label reading, purity and testing are covered on the creatine label page. If you take medicines or have kidney or liver conditions, ask a pharmacist before using any sport product. For symptoms after a product, see warning signs.