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Ketone Esters

Morning or before exercise

Ketone esters are synthetic compounds that deliver beta-hydroxybutyrate (BHB) directly into the bloodstream, rapidly elevating blood ketone levels within 15-30 minutes of ingestion. Unlike ketone salts that are bonded to minerals like sodium or calcium, ketone esters provide a concentrated dose of pure ketone bodies without added electrolytes. They are most actively studied for their potential in brain injury recovery, cognitive enhancement under metabolic stress, and endurance athletic performance.

Andrew Huberman
Andrew HubermanReported use
Research Evidence
Supports cognitive function under metabolic stress such as fasting or hypoxia
Moderate
May provide neuroprotective benefits following traumatic brain injury
Moderate
Promotes BDNF production and anti-inflammatory signaling in the brain
Moderate
Elevates blood BHB levels rapidly after oral ingestion
Strong
May improve endurance exercise performance as a supplemental fuel source
Limited
Source: Examine.com

Expert Evidence

9 references from 4 experts

“Nowadays I sometimes will throw some ketones in there, not because I'm on a ketogenic diet but for I do feel like it makes my level of focus and cognition better.”

Control Stress for Healthy Eating, Metabolism & Aging | Dr. Elissa Epel

55:23

6 references in 5 episodes from 2021–2023

Safety & Cautions

Side Effects

  • GI distress including nausea
  • Bitter or unpleasant taste
  • Stomach cramping at higher doses
  • Transient diarrhea
Ketone esters are generally well-tolerated at studied doses, though gastrointestinal side effects are common especially at higher amounts. Individuals with type 1 diabetes or metabolic conditions affecting ketone metabolism should consult a physician before use, as exogenous ketones can compound endogenous ketone production.
Pairs Well With
Omega-3 Fatty Acids (EPA)Creatine