Oil
    Moderate Evidence

    MCT Oil

    Medium Chain Triglycerides

    TL;DR

    MCT oil is a concentrated source of medium-chain triglycerides (C8/C10) that are absorbed directly into the portal vein and converted to ketones by the liver. It reliably raises blood ketones and may modestly support weight management and exercise fueling, but it is not a shortcut to ketosis and large doses commonly cause GI distress.

    Ideal For

    • People on ketogenic or low-carb diets wanting a ketone boost
    • Those seeking a quick non-carb energy source
    • Individuals with fat-malabsorption conditions under medical supervision

    Avoid If

    • You have uncontrolled diabetes (risk of ketoacidosis at high doses)
    • You experience diarrhea or cramping with fats
    • You expect significant weight loss without dietary change

    Frequently Asked Questions

    Overview

    Medium-chain triglycerides are fatty acids of 6-12 carbons that bypass normal fat digestion: they travel via the portal vein to the liver and are rapidly oxidised or converted to ketone bodies. Commercial MCT oil is fractionated from coconut or palm kernel oil and typically contains caprylic acid (C8) and capric acid (C10); C8 raises ketones more efficiently. Evidence supports acute ketone elevation and small effects on satiety and energy expenditure (roughly 50-100 kcal/day in metabolic studies). Trials in mild cognitive impairment show ketone uptake in the brain improves cognition modestly in APOE4-negative subjects. Weight-loss meta-analyses show only modest effects (~0.5 kg over placebo). Claims of dramatic fat loss or athletic performance enhancement are not supported; endurance evidence is weak and large doses impair performance via GI symptoms.

    How It Works

    • Portal absorption bypasses chylomicron packaging, delivering fatty acids directly to the liver
    • Rapid hepatic beta-oxidation produces ketone bodies (beta-hydroxybutyrate, acetoacetate)
    • Ketones cross the blood-brain barrier and serve as alternative neuronal fuel
    • Modest increases in thermogenesis and satiety hormones (peptide YY, leptin)

    Benefits & Outcomes

    Ketone Production Support

    Metabolic
    Strong yes
    Strong Evidence

    MCT oil raises blood ketones within an hour and can be taken without full carbohydrate restriction.

    Health Concerns Addressed

    No linked health concerns yet.

    Supporting Research
    10 studies

    Effects of Medium-Chain Triglycerides on Weight Loss and Body Composition: A Meta-Analysis of Randomized Controlled Trials

    Score: 8/10
    2015
    meta_analysis
    n=749

    Mumme K, Stonehouse W

    Replacing long-chain with medium-chain triglycerides produced small reductions in body weight, waist circumference and fat mass.

    View source

    The Effect of Medium Chain Triglycerides on Time to Nutritional Ketosis and Symptoms of Keto-Induction in Healthy Adults: A Randomised Controlled Clinical Trial

    Score: 6/10
    2018
    rct
    n=28

    Harvey CJ, Schofield GM

    MCT supplementation shortened time to nutritional ketosis and reduced keto-induction symptoms

    View source

    Endogenous fat oxidation during medium chain versus long chain triglyceride feeding in healthy women

    Score: 6/10
    2000
    crossover
    n=12

    Papamandjaris AA, White MD, Raeini-Sarjaz M

    greater combined cumulative fractional LCSFA oxidation (16.9 +/- 2.5%/5.5 h vs 9.1 +/- 1.2%/5.5 h, P < 0.007)

    View source

    The Effects of Medium Chain Triglyceride for Alzheimer Disease Related Cognitive Impairment: A Systematic Review and Meta-Analysis

    Score: 7/10
    2023
    meta_analysis

    Sun L, Ye KX, Wong T

    Pooled trials showed small and inconsistent cognitive improvements with MCT in Alzheimer disease.

    View source

    Ketosis After Intake of Coconut Oil and Caprylic Acid-With and Without Glucose: A Cross-Over Study in Healthy Older Adults

    Score: 6/10
    2020
    crossover
    n=15

    Norgren J, Sindi S

    Caprylic acid produced markedly higher ketone levels than coconut oil; co-ingested glucose blunted the ketone rise

    View source

    Effects of medium-chain triglycerides on appetite and food intake: a systematic review

    Score: 7/10
    2021
    systematic_review

    Maher T, Clegg ME

    Acute MCT intake modestly raised satiety hormones, but effects on subsequent energy intake were inconsistent.

    View source

    Effects of Exogenous Ketone Supplementation on Blood Glucose: A Systematic Review and Meta-analysis

    Score: 8/10
    2022
    meta_analysis

    Falkenhain K, Daraei A

    Exogenous ketones reliably raised circulating beta-hydroxybutyrate across trials

    View source

    Medium-chain triglycerides increase energy expenditure and fat oxidation compared with long-chain triglycerides: a randomized controlled trial

    Score: 6/10
    2008
    rct
    n=49

    St-Onge MP, Bosarge A

    MCT oil within a weight-loss diet produced greater fat mass loss than olive oil over 16 weeks.

    View source

    Pilot feasibility and safety study examining the effect of medium chain triglyceride supplementation in subjects with mild cognitive impairment

    Score: 4/10
    2015
    rct
    n=6

    Rebello CJ, Keller JN, Liu AG

    MCT raised circulating ketones but produced no significant cognitive improvement in mild cognitive impairment.

    View source

    Use of medium chain triglyceride (MCT) oil in subjects with Alzheimer disease: a randomized, double-blind, placebo-controlled crossover study

    Score: 5/10
    2022
    crossover
    n=20

    Juby AG, Blackburn TE, Mager DR

    MCT oil raised ketones and improved some memory and language subscores in Alzheimer disease.

    View source

    Safety Information

    Potential Side Effects

    Dose-dependent nausea, cramping, bloating and diarrhoea are the most common effects, especially above 15-20 g in a single dose.

    Contraindications

    Uncontrolled type 1 diabetes; severe liver disease (hepatic metabolism of MCTs is rapid).

    Drug Interactions

    • None well documented

    Pregnancy & Breastfeeding

    Pregnancy: insufficient_data

    Breastfeeding: insufficient_data

    Dosage Guidelines

    Dosage Used in Studies

    5-30 g

    Best Time to Take

    Morning or pre-exercise

    Best Form

    C8-dominant oil for ketones; blended C8/C10 for value

    Dosing by Goal

    GoalDoseNotes
    10-14 g (1 tbsp)Start at 5 g and titrate up over 1-2 weeks
    20-30 g C8Doses used in MCI trials

    Forms Compared

    Most ketogenic per gram; highest GI upset risk

    Standard, cheaper; moderate ketone response

    Acacia-fibre carrier; easier on gut, mixes into coffee

    Food & Timing

    Can be taken without food; taking with food reduces GI side effects.

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.