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What’s Actually in Your Creatine? Is it safe? What Independent Lab Testing Has Found

ginofallen
Sep 9
4 min read
Hand holding creatine sample bottle in laboratory

Creatine monohydrate is one of the most researched compounds in sports nutrition — but "creatine monohydrate" on a label doesn’t guarantee you’re getting a clean, safe, single compound. Independent laboratory testing over the past 15 years has repeatedly found that a meaningful share of commercial creatine supplements carry manufacturing by-products well above the levels European regulators consider acceptable. This is not a marketing claim — it’s published, peer-reviewed data, and it’s worth understanding before you decide what you’re putting into a daily protocol.


The study: 33 commercial creatine products, independently tested. Are they safe?

A peer-reviewed analysis published in Food Chemistry tested 33 creatine supplements sold across Europe and the United States for purity, organic contaminants and heavy metals, using HPLC and ICP-MS methodology[1]. The findings:

Contaminant

EFSA recommended maximum

What testing found

Creatinine (degradation by-product)

100 mg/kg

Exceeded in 44% of samples tested

Dihydrotriazine (DHT)

Non-detectable (<4.5 mg/kg)

Detected above threshold in ~15% of samples, up to 8.0 mg/kg

Dicyandiamide (DCD)

50 mg/kg

Exceeded in ~15% of samples

Heavy metals (As, Cd, Hg, Pb)

1 mg/kg each

Only mercury detected, and below 1 mg/kg in all samples

The topline finding: half of the commercial creatine products tested exceeded EFSA’s recommended maximum levels for organic contaminants. These aren’t exotic products from unregulated markets — this is a representative slice of what’s sold across mainstream retail channels in Europe and the US.


Why this happens: it’s a manufacturing process problem, not an ingredient problem

Creatinine, DCD and DHT aren’t added deliberately — they’re by-products of how creatine monohydrate is synthesised. Conventional synthesis routes rely on high-temperature drying and less controlled reaction conditions, both of which increase the formation of these by-products[2]:

  • High-temperature drying accelerates thermal degradation of creatine into creatinine.

  • Aggressive solvents and uncontrolled reaction pathways increase formation of DCD and DHT.

  • Sampling-based quality control — testing a subset of batches rather than every batch — means contamination in an untested batch can reach the shelf undetected.


This is the manufacturing reality that a "creatine monohydrate" label doesn’t disclose. Two products can carry an identical ingredient list and dosage and differ substantially in what else made it into the tub.


The proprietary blend problem — a different kind of opacity

Contaminant testing is one blind spot. Proprietary blends are a separate, more deliberate one. As of a 2023 analysis of the US Dietary Supplement Label Database, 20% of supplement labels used proprietary blends — and under current disclosure law, a brand only has to state the total weight of the blend, not how much of each individual ingredient it contains[1].


Practically, that means a "performance blend" listing five ingredients might be 95% of the cheapest one and a fraction of a gram each of the other four — and the label is fully compliant while telling you almost nothing about the actual dose of anything that matters. For someone building a protocol around specific, clinically studied doses — the entire premise of using single-ingredient supplements in the first place — a proprietary blend defeats the purpose before you’ve even opened the tub.


What "third-party tested" should actually mean

"Third-party tested" is printed on a lot of labels, but it’s not a standardised claim — it can mean anything from a single sample tested once at launch to universal, batch-by-batch testing published for every lot. The distinction matters:

  • Batch-based testing (the stronger standard): every production lot is independently tested, and the certificate of analysis is specific to the batch you’re holding, not a representative sample from years ago.

  • Sampling-based testing (the weaker, more common standard): a subset of batches is tested periodically, leaving gaps where an untested batch — including one with elevated contaminants — reaches retail.


For a compound taken daily, often for years, at doses of 3–5 g or more, this is not a minor technicality. It’s the difference between a documented, verifiable product and a label you have to take on faith.


Where BNE Nutrients’ Pürest Creatine™ sits against this data

BNE Nutrients uses Pürest Creatine™, manufactured by NNB Nutrition using a proprietary low-temperature synthesis process specifically engineered to avoid the high-heat and uncontrolled-solvent pathways that generate DCD and DHT in conventional creatine manufacturing. Independent comparison data places it well inside EFSA’s recommended limits, with DHT reported as non-detectable and DCD substantially below the 50 mg/kg threshold — a materially different profile from the generic and even "premium" creatine benchmarks tested in the same comparison[2].


Every production lot is tested using the USP method, with a batch-specific certificate of analysis — not a one-off sample from a single batch years ago. There is no proprietary blend: the label lists one ingredient, at one disclosed dose, because that’s the entire product.


This isn’t a claim that every other creatine on the market is unsafe — the mercury and heavy metal data above shows genuine floors exist across the category. It’s a case for reading past the front-of-pack claims and asking two specific questions before you commit to a daily supplement: is every batch tested, and can you see the certificate for the one you’re holding?


This article is for general educational purposes and does not constitute medical advice. Consult your healthcare provider before starting any new supplement.

Sources




[1]Levels of creatine, organic contaminants and heavy metals in commercial creatine supplements, Food Chemistry — https://www.sciencedirect.com/science/article/abs/pii/S0308814610016377

[2]Levels of creatine, organic contaminants and heavy metals in commercial creatine supplements, Food Chemistry — https://www.sciencedirect.com/science/article/abs/pii/S0308814610016377

[3]Perspectives on the Use of Proprietary Blends in Dietary Supplements, PMC — https://pmc.ncbi.nlm.nih.gov/articles/PMC10196566/

[4]NNB Nutrition Launches Pürest Creatine, PriceLow — https://blog.priceplow.com/supplement-ingredients/purest-creatine

 
 
 

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