MCT Oil (Medium-Chain Triglycerides)

Commonly used for

Weight ManagementEnergyMetabolic HealthInflammationWeight LossFocus

What is it? / Overview

MCTs are rapidly absorbed and oxidized and can increase circulating ketones, particularly C8. When substituted for some long-chain dietary fats, clinical trials suggest MCTs may produce small improvements in body weight/body composition and may modestly affect satiety or energy expenditure.

How is it used? / Administration

Form: Liquid oil (C8/C10 caprylic/capric triglycerides preferred over coconut-oil-derived blends) or powder

Typical dose studied: 1–2 tablespoons (14–28 g)/day, starting with 1 tsp to assess GI tolerance

Timing: With meals or coffee; start low and increase gradually to avoid GI upset

C8 (caprylic acid) is metabolized to ketones fastest, followed by C10 (capric acid); coconut oil is only ~14% C8/C10 by comparison, making dedicated MCT oil more concentrated and predictable for ketone production than coconut oil itself.

How well does it work? / Evidence

~ Moderate evidence

Who should avoid it?

Already taking it? GI upset (diarrhea, cramping, nausea) is dose-dependent and common when starting too high -- begin with 1 teaspoon and increase gradually over 1-2 weeks.

Research & references

St-Onge MP, Bosarge A. (2008). Weight-loss diet that includes consumption of medium-chain triacylglycerol oil leads to a greater rate of weight and fat mass loss than does olive oil. American Journal of Clinical Nutrition. Mumme K, Stonehouse W. (2015). Effects of medium-chain triglycerides on weight loss and body composition: a meta-analysis of randomized controlled trials. Journal of the Academy of Nutrition and Dietetics. Vandenberghe C et al. (2017). Tricaprylin alone increases plasma ketone response more than coconut oil or other medium-chain triglycerides. Nutrition.