Also known as: CEE, Creatine ester, Ethyl ester creatine
Performance & PowerEmerging evidence
A creatine form sold on better absorption, which research shows degrades to a waste product before it reaches your muscles. One of the clearer cases in this index where the evidence points the other way.
Typical dose
3.0–5.0 g per day
Not recommended; use creatine monohydrate instead
What it is
Creatine ethyl ester is creatine with an ethyl group attached, intended to make the molecule more fat-soluble and therefore better able to cross cell membranes.
The reasoning was sound on paper. Creatine monohydrate is water-soluble and relies on a specific transporter to enter muscle, so a form that could pass through membranes directly would in theory need smaller doses and no loading phase.
Testing that idea produced a clear answer, and it went against the product. The ester bond is unstable in stomach acid, and the molecule converts to creatinine, a waste product the body excretes.
How it works
Creatine works by increasing muscle phosphocreatine stores, which regenerate ATP during short maximal efforts. That mechanism is well established and applies to any form that actually reaches muscle as creatine.
The ester was intended to bypass the creatine transporter and enter cells directly.
What happens instead is non-enzymatic conversion to creatinine in acidic conditions, which occurs rapidly in the stomach. Creatinine has no ergogenic effect and is simply filtered out by the kidneys.
What the evidence shows
Laboratory analysis has shown that creatine ethyl ester degrades to creatinine rapidly under acidic conditions, considerably faster than creatine monohydrate does.
A controlled trial comparing it with monohydrate and placebo over seven weeks of resistance training found that the ester raised blood creatinine substantially while producing smaller increases in muscle creatine content than monohydrate.
This entry sits at Emerging on the grading scale, which reflects the weight of support for the product rather than uncertainty about the science. The evidence here is reasonably clear, and it favours monohydrate.
If you want something other than monohydrate powder, creatine hydrochloride is a far superior form to the ethyl ester. It is stable in stomach acid rather than converting to creatinine, dissolves readily, and arrives at muscle as creatine, which is the whole point.
Dosing
Products typically suggest 2 to 3 g daily on the basis of superior absorption, a claim the research does not support.
The practical recommendation is straightforward: use creatine monohydrate at 3 to 5 g daily. It is the most researched supplement in sports nutrition, it works, and it is among the cheapest ingredients you can buy.
If you dislike monohydrate for a specific reason such as digestive discomfort, micronised monohydrate or creatine hydrochloride are more sensible alternatives than the ethyl ester.
Degrades to creatinine within minutes in acidic conditions
Timing
Not recommended; use creatine monohydrate instead
Competition status
Permitted — not on the WADA Prohibited List
Category
Performance & Power
Safety and side effects
Creatine ethyl ester has not been associated with significant harm in the limited research available, and reported effects are mild.
One practical point worth knowing: it raises blood creatinine noticeably. Creatinine is used as a marker of kidney function, so taking this before a blood test can produce a result that looks concerning without anything actually being wrong.
Mention any creatine use to whoever ordered the test. Speak to your doctor before use if you take regular medication.
Who should avoid it
Tell your doctor about any creatine use before a blood test, since it raises creatinine, a marker used to assess kidney function. Speak to your doctor before use if you have been told your kidneys are not working normally, or if you take regular medication. Creatine monohydrate is the better-evidenced choice.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
