Ketone Esters
Also known as: exogenous ketones, beta-hydroxybutyrate esters, ketone monoesters, 3-hydroxybutyrate-(R)-1,3-butanediol ester
Randomized human trials show that oral ketone esters reliably raise circulating β‑hydroxybutyrate and shift whole-body substrate use away from carbohydrates toward ketone and lipid oxidation. Clinical and athletic outcomes are mixed: some studies reported improved endurance performance or reduced overreaching symptoms, while others found no improvement in peak exercise capacity or glucose/insulin sensitivity in weight‑maintaining settings.
Last reviewed: 2026-10-14 · 5 indexed studies
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Overview
Ketone esters are synthetic compounds that raise blood ketone (β‑hydroxybutyrate) levels when taken orally. Human trials have tested them for effects on substrate use during exercise, mitigation of training stress, and short-term cardiometabolic and hemodynamic effects in clinical populations.
Mechanism & Function
Mechanism of Action
Oral ketone esters increase circulating β‑hydroxybutyrate, which serves as an alternative oxidative substrate for skeletal muscle and heart, reduces glycolysis and plasma lactate, and shifts fuel selection toward ketone and lipid oxidation. Hemodynamic effects (increased cardiac output, reduced filling pressures) have been observed in some heart failure populations.
Physiological Role
Provides an exogenous ketogenic substrate (β‑hydroxybutyrate) that can be oxidised by muscle and cardiac tissue, alter whole-body fuel partitioning, and modulate metabolic and neurohormonal responses to exercise and stress.
Primary Pathways
Performance / Health Relevance
Ketone esters can acutely change substrate use during exercise and, in some athlete studies, reduce markers of training stress and improve endurance performance measures. However, benefits are not consistent across populations and contexts; cardiopulmonary exercise capacity was not improved in an older HFpEF cohort despite robust ketosis.
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
- Human trials have used single doses in the range of ~20–25 g and repeated doses totaling ~24–100 g/day; some acute effects were seen with single doses around 25 g.
- Optimal Range
- Not established; studies used single doses ~25 g or multiple daily doses totaling ~24–100 g.
- Upper / Caution Level
- Not established
- Timing
- Used both pre-exercise (acute dosing) and post-exercise or multiple times daily for sustained elevation; timing depends on target (acute performance vs sustained haemodynamic/metabolic effects).
- Best Format
- Oral ketone ester beverage or drinkable formulation (monoester forms used in trials).
- Bioavailability
- Ketone esters reliably raise plasma β‑hydroxybutyrate to supraphysiological concentrations in a dose-dependent manner in humans.
- Absorption Considerations
- Gastrointestinal tolerability can vary; studies administer ketone esters as concentrated drinks and monitor levels at trough and post-dose.
Safety & Interactions
Side Effects
- •Gastrointestinal discomfort reported in some ketone ester studies (not detailed in provided abstracts)
- •Transient reductions in plasma glucose and free fatty acids
Contraindications
- Unclear in pregnancy and lactation (no evidence in provided abstracts)
- Caution in patients with disorders of ketone metabolism
Drug Interactions
- •Potential interactions not described in provided abstracts; monitor concomitant glucose‑lowering therapies in clinical populations
Who Should Avoid
- •People with type 1 diabetes or those prone to diabetic ketoacidosis without medical supervision
- •Those who experience significant gastrointestinal intolerance to concentrated oral esters
Monitoring
Monitor blood ketone and glucose levels in clinical populations; observe haemodynamics in heart failure patients when used experimentally.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Ketone Esters typically used or indicated?
Ketone Esters is most commonly used for: Acute exercise performance enhancement, Attenuation of training-induced overreaching, Substrate switching during exercise, Experimental cardiometabolic therapy. Provides an exogenous ketogenic substrate (β‑hydroxybutyrate) that can be oxidised by muscle and cardiac tissue, alter whole-body fuel partitioning, and modulate metabolic and neurohormonal responses to exercise and stress.
How does Ketone Esters work?
Oral ketone esters increase circulating β‑hydroxybutyrate, which serves as an alternative oxidative substrate for skeletal muscle and heart, reduces glycolysis and plasma lactate, and shifts fuel selection toward ketone and lipid oxidation. Hemodynamic effects (increased cardiac output, reduced filling pressures) have been observed in some heart failure populations.
What is the recommended dose of Ketone Esters?
The optimal range is Not established; studies used single doses ~25 g or multiple daily doses totaling ~24–100 g.. with a minimum effective dose of Human trials have used single doses in the range of ~20–25 g and repeated doses totaling ~24–100 g/day; some acute effects were seen with single doses around 25 g.. Best taken: Used both pre-exercise (acute dosing) and post-exercise or multiple times daily for sustained elevation; timing depends on target (acute performance vs sustained haemodynamic/metabolic effects).. Upper / caution level: Not established.
What are the side effects of Ketone Esters?
Reported side effects include: Gastrointestinal discomfort reported in some ketone ester studies (not detailed in provided abstracts); and Transient reductions in plasma glucose and free fatty acids. Monitoring: Monitor blood ketone and glucose levels in clinical populations; observe haemodynamics in heart failure patients when used experimentally.
Does Ketone Esters interact with medications?
Known or theoretical interactions: Potential interactions not described in provided abstracts; monitor concomitant glucose‑lowering therapies in clinical populations. Always check with a clinician before combining with prescription medication.
Who should avoid Ketone Esters?
Ketone Esters is generally not recommended for: People with type 1 diabetes or those prone to diabetic ketoacidosis without medical supervision; Those who experience significant gastrointestinal intolerance to concentrated oral esters; Unclear in pregnancy and lactation (no evidence in provided abstracts); and Caution in patients with disorders of ketone metabolism.
How strong is the evidence for Ketone Esters?
Evidence level: Moderate (overall score 67/100), based on 5 indexed studies on SuppIndex.
Research & References (5)
Nutritional Ketosis Alters Fuel Preference and Thereby Endurance Performance in Athletes.
Five studies in 39 high-performance athletes used a ketone ester to induce ketosis and examined fuel selection and endurance. Ketosis decreased muscle glycolysis and plasma lactate, provided an alternative oxidative substrate, and increased intramuscular triacylglycerol oxidation even with normal muscle glycogen and carbohydrate co-ingestion.
Ketone ester supplementation blunts overreaching symptoms during endurance training overload.
A 3-week overload endurance training trial in fit men compared post-session ketone ester vs control (KE n=9, CON n=9). KE blunted physiological markers of overreaching, reduced nocturnal catecholamine excretion, attenuated decreases in resting and exercise heart rates, and increased sustainable training load and power output in a final endurance test.
Effect of weight-maintaining ketogenic diet on glycemic control and insulin sensitivity in obese T2D subjects.
Twenty-nine overweight/obese subjects were randomised for 10 days to weight-maintaining standard diet, weight-maintaining ketogenic diet, or ketogenic diet plus ketone ester (8 g every 8 hours). Despite a twofold rise in plasma β‑hydroxybutyrate, glucose tolerance and whole-body insulin sensitivity were unchanged across groups when weight was maintained.
Randomized Crossover Trial of 2-Week Ketone Ester Treatment in Patients With Type 2 Diabetes and Heart Failure With Preserved Ejection Fraction.
In a 6-week randomized double-blind crossover trial in 24 patients with type 2 diabetes and HFpEF, 2 weeks of ketone ester treatment (25 g D‑β‑hydroxybutyrate-(R)-1,3-butanediol ×4 daily) increased circulating 3‑hydroxybutyrate ~10‑fold and increased cardiac output, reduced pulmonary capillary wedge pressure at rest and peak exercise, improved stroke volume at peak exercise, and reduced ventricular stiffness indices.
Crossover Trial of Exogenous Ketones on Cardiometabolic Endpoints in Heart Failure With Preserved Ejection Fraction.
A randomized, crossover, placebo-controlled acute ketone ester trial in 20 symptomatic HFpEF participants tested peak VO2 and time to exhaustion. Ketone ester produced robust ketosis, lowered respiratory exchange ratio, glucose and non-esterified fatty acids, and altered haemodynamics at rest, but did not improve peak VO2 or constant-intensity exercise endurance.
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Maltodextrin
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Research Overview
Moderate EvidenceCite this ingredient
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Stable URL
https://thesuppindex.com/ingredients/ketone-esters
SuppIndex. (2026). Ketone Esters: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/ketone-esters
Based on 5 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
Co-ingestion with carbohydrate was permitted in some athlete studies; interactions with common ergogenic aids are not described in the provided trials.