Creatine Ethyl Ester
Also known as: CEE, creatine ethylester
Randomised trials in athletes and in middle‑aged women report mixed effects: some small trials found cognitive benefits or greater gains in sprint/peak power with CEE-containing regimens, while at least one trial in patients with creatine transporter deficiency found no increase in brain creatine after 12 months. A recent trial that compared several creatine formulations during a 4‑week training phase reported greater improvements in physical performance and peak power with CEE versus creatine monohydrate, and a small cognitive trial reported benefits on some tasks. Overall the human evidence is limited in size and heterogeneous in design and dosing.
Last reviewed: 2026-10-14 · 4 indexed studies
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Overview
Creatine ethyl ester (CEE) is a lipophilic esterified form of creatine marketed as an orally available alternative to creatine monohydrate. Human trials show mixed effects on cognition and some short-term improvements in sprint/power outcomes when combined with training; evidence for raising brain creatine is inconsistent.
Mechanism & Function
Mechanism of Action
CEE is an ethyl ester prodrug of creatine intended to increase lipophilicity and passive uptake across membranes, potentially improving cellular or brain creatine delivery compared with creatine monohydrate. In vitro data suggest some passive transport, but clinical data do not consistently show increased brain creatine.
Physiological Role
Provides a creatine moiety that can contribute to creatine–phosphocreatine energy buffering in tissues if bioavailable and taken up by cells.
Primary Pathways
Performance / Health Relevance
If converted to creatine and taken up by muscle, CEE could support short, high‑intensity efforts via increased phosphocreatine availability; clinical data show some improvements in peak power and sprint performance in short training periods.
Evidence Review
No meta-analyses or systematic reviews indexed for this ingredient yet.
Dimensions marked N/A have no indexed evidence of that class. They are shown as unavailable rather than scored.
Practical Use & Dosage
- Minimum Effective Dose
- Not established from available abstracts
- Optimal Range
- Not established
- Upper / Caution Level
- Not established
- Timing
- Not established
- Best Format
- Oral
- Bioavailability
- CEE is more lipophilic than creatine monohydrate and was developed to enhance membrane permeability; clinical evidence for improved brain or muscle creatine uptake is inconsistent.
- Absorption Considerations
- Claims of superior absorption relative to creatine monohydrate are not consistently supported by human trials.
Safety & Interactions
Side Effects
- •Generally well tolerated in small trials; no severe adverse events reported in included abstracts
Contraindications
- None specified in provided abstracts
Drug Interactions
- •None specified in provided abstracts
Who Should Avoid
- •People with known kidney disease should consult a clinician before creatine forms; not assessed in these abstracts
Monitoring
Clinical monitoring recommendations are not provided in the cited trials; typical creatine precautions (renal function monitoring in at‑risk individuals) may apply.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Creatine Ethyl Ester typically used or indicated?
Creatine Ethyl Ester is most commonly used for: Sport performance (short-term sprint/peak power), Cognitive support, Attempts to raise brain creatine. Provides a creatine moiety that can contribute to creatine–phosphocreatine energy buffering in tissues if bioavailable and taken up by cells.
How does Creatine Ethyl Ester work?
CEE is an ethyl ester prodrug of creatine intended to increase lipophilicity and passive uptake across membranes, potentially improving cellular or brain creatine delivery compared with creatine monohydrate. In vitro data suggest some passive transport, but clinical data do not consistently show increased brain creatine.
What is the recommended dose of Creatine Ethyl Ester?
The optimal range is Not established. with a minimum effective dose of Not established from available abstracts. Best taken: Not established. Upper / caution level: Not established.
What are the side effects of Creatine Ethyl Ester?
Reported side effects include: Generally well tolerated in small trials; no severe adverse events reported in included abstracts. Monitoring: Clinical monitoring recommendations are not provided in the cited trials; typical creatine precautions (renal function monitoring in at‑risk individuals) may apply.
Does Creatine Ethyl Ester interact with medications?
Known or theoretical interactions: None specified in provided abstracts. Always check with a clinician before combining with prescription medication.
Who should avoid Creatine Ethyl Ester?
Creatine Ethyl Ester is generally not recommended for: People with known kidney disease should consult a clinician before creatine forms; not assessed in these abstracts; and None specified in provided abstracts.
How strong is the evidence for Creatine Ethyl Ester?
Evidence level: Limited (overall score 52/100), based on 4 indexed studies on SuppIndex.
Research & References (4)
The Effects of 8-Week Creatine Hydrochloride and Creatine Ethyl Ester Supplementation on Cognition, Clinical Outcomes, and Brain Creatine Levels in Perimenopausal and Menopausal Women (CONCRET-MENOPA): A Randomized Controlled Trial.
Randomised double‑blind 8‑week trial in 36 perimenopausal and menopausal women comparing low and medium doses of creatine hydrochloride, a creatine hydrochloride plus creatine ethyl ester group, and placebo. Medium‑dose creatine hydrochloride improved reaction time, increased frontal brain creatine, and improved lipid profile versus placebo. The creatine hydrochloride plus creatine ethyl ester group (800 mg/day listed) was included but specific effects attributable to CEE alone were not reported.
Cognitive effects of creatine ethyl ester supplementation.
Double‑blind, placebo‑controlled study of creatine ethyl ester supplementation assessing performance on five cognitive tasks. The creatine condition showed improvements over placebo on several measures, though the authors note replication and objective compliance measures are needed.
Response to creatine analogs in fibroblasts and patients with creatine transporter deficiency.
Study of creatine analogues in fibroblasts and an open clinical trial in four patients with creatine transporter deficiency. In vitro CEE increased creatine uptake into fibroblasts, but in four treated patients, 12 months of CEE did not improve neuropsychological outcomes or brain creatine measured by MRS.
Creatine formulations and repeated sprint training: effects on physical and physiological adaptations in soccer players during the short-term preparation phase.
Randomised trial in 40 collegiate male soccer players during a 4‑week preparatory phase comparing creatine monohydrate, creatine ethyl ester, creatine hydrochloride and placebo alongside repeated sprint training. All training groups improved, but creatine supplement groups had greater changes than placebo; the CEE and HCl groups showed larger gains in physical performance and peak power than creatine monohydrate.
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Research Overview
Limited EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/creatine-ethyl-ester
SuppIndex. (2026). Creatine Ethyl Ester: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/creatine-ethyl-ester
Based on 4 indexed studies · Evidence level: Limited.
Goal Ratings
Stack Compatibility
Studied alongside exercise training and other creatine formulations; effects compared to creatine monohydrate and creatine hydrochloride in trials.