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Tested by an independent lab. Numbers published.
Our creatine monohydrate is one single ingredient. Nothing else. We source and order it in bulk, and every batch we order is independently tested before it goes anywhere near production. Here are the latest results — the actual numbers, not a badge. We update this page as each new third-party certificate comes in.
100.5%
creatine monohydrate, dried basis
Cawthron Institute
Not detected
arsenic · cadmium · mercury · lead
all below
detection limits · Cawthron Institute
What we test, and why it matters
- Tested
Identity & purity assay
Confirms the powder is creatine monohydrate, and how much of it is. It’s the test that answers “is this actually what it says it is.” The latest assay came back at 100.5% against a specification of 98.0–102.0%.
- Tested
Loss on drying
Creatine monohydrate holds water inside its crystal structure by design — that’s what the “monohydrate” means. This test checks that water sits where it should (10.5–12.5%). Ours is 11.5%, which is how you know it’s true monohydrate rather than something blended.
- Tested
Heavy metals
Creatine is a manufactured ingredient, and manufacturing is where contamination enters. Cawthron screened the current batch for the four heavy metals that matter — arsenic, cadmium, mercury and lead. All four came back below the laboratory’s detection limits.
How can purity be over 100%?
Every lab measurement carries a tiny margin of error, so a completely pure sample can read a touch over or under 100% on any given run. That’s why the official specification is a band around 100% — 98.0% to 102.0% — rather than a single number.
So 100.5% means “as pure as the method can measure” — not more creatine than creatine.
Latest results
| Test | Result | Specification | Outcome | Certificate |
|---|---|---|---|---|
| Creatine monohydrate assay (dried basis) | 100.5% | Specification: 98.0–102.0% | Passed | View certificate E21139-1 |
| Loss on drying | 11.5% | Specification: 10.5–12.5% | Passed | View certificate E21139-1 |
| Arsenic | <0.1 mg/kg = <0.1 ppm | EU limit: 1 mg/kg (1 ppm) | Not detected | View certificate E21177-1 |
| Cadmium | <0.04 mg/kg = <0.04 ppm | EU limit: 1 mg/kg (1 ppm) | Not detected | View certificate E21177-1 |
| Mercury | <0.05 mg/kg = <0.05 ppm | EU limit: 1 mg/kg (1 ppm) | Not detected | View certificate E21177-1 |
| Lead | <0.05 mg/kg = <0.05 ppm | EU limit: 1 mg/kg (1 ppm) | Not detected | View certificate E21177-1 |
Why the assay is measured “dried basis”. Creatine monohydrate is about 12% water by weight, held in the crystal itself. Testing the dried powder is how the purity of the creatine is measured without that water skewing the number — and the loss-on-drying test above confirms the water content is exactly where it should be.
About these results. All results are from certificates of analysis issued by Cawthron Institute, an independent New Zealand laboratory, on samples of the bulk creatine batches we order; results apply to the samples as tested. Values shown as “<” mean the substance was not detected at the laboratory’s stated detection limit — they are detection limits, not measured amounts, and detection limits can vary between samples. The European reference figure (maximum 1 mg/kg per metal) is the specification for creatine monohydrate recorded in the European Food Safety Authority’s 2004 opinion on creatine monohydrate. Loss on drying follows the United States Pharmacopeia method; heavy metals are screened by ICP-MS (APHA 3125B).
This page reports the quality testing of our own ingredient only. It is not a comparison with, or a claim about, any other brand or product. Microbiological safety testing is carried out by our manufacturer as part of New Zealand’s manufacturing requirements before any product is released. We update this page as new certificates arrive — processing and publishing new results can take up to twenty working days.
