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MCT oil

Medium-chain triglycerides

Supplements. Modern nutrition.

Also called Medium-chain triglyceride oil, Caprylic/capric triglyceride, Coconut MCT oil

Pinyin: zhōng liàn gān yóu sān zhǐ

Spanish: Triglicéridos de cadena media (aceite MCT)

Can cause stomach upset

An oil made of medium-length fats that the body digests quickly, sold for energy, ketogenic diets and people who have trouble absorbing fat.

Did you know? MCTs go straight to the liver through the blood, and the liver can turn them into ketones, a fuel the body also makes during fasting.

What it may help, and how strong the proof is

Digestion & gut health. Doctors use MCT-based formulas for people who cannot absorb normal fats well. This is a medical use under a doctor's care, not proof of benefit for healthy people.See the research: 5 studies in people
Promising proof
Weight. Some trials show MCTs may raise calorie burn a little or lower body fat compared with long-chain fats. Results are small and mixed.See the research: 22 studies in people
Promising proof
Memory & focus. Small human trials in people with Alzheimer's disease tested medium-chain fats as a ketone fuel for the brain. A few showed modest gains, mostly in a subgroup, and the largest later trial did not succeed. Larger trials are needed.See the research: 6 studies in people
Promising proof
Energy & tiredness. MCTs are digested fast and burned for fuel, which is why they are sold as quick energy. In trained athletes, most studies found no better endurance or performance.See the research: 14 studies in people
Unproven
Cholesterol. A popular idea is that MCT oil helps cholesterol. That is not supported. In a small study of 17 healthy young men, 70 grams a day raised LDL (bad) cholesterol compared with a plant oil. Other small studies at lower doses found no change.See the research: 46 studies in people
Unproven

Parts of the body

Gut & intestines, Stomach, Energy & metabolism, Brain & mind, Heart & vessels, Liver

Traditional use

MCT oil is a modern product, developed in medicine to help people who cannot digest or absorb normal fats well. Coconut and palm kernel oil, which contain MCTs, have long been part of diets in tropical regions.

How it is classified

Herbal actions: Nutritive, Tonic. Energy: neutral.

How people take it

Common amounts are 1 to 2 tablespoons a day in coffee, a smoothie or a meal, starting with 1 teaspoon to limit stomach upset. In one small study of healthy young men, about 70 grams a day (roughly 5 tablespoons) raised LDL cholesterol compared with a plant oil, so more is not better.

Oil and food.

Where to get it

Most MCT oil is made from coconut oil or palm kernel oil, then processed to keep mostly caprylic (C8) and capric (C10) fats. It is sold as liquid oil, powder and softgel capsules, in stores and online. Whole coconut oil also contains MCTs, but mixed with other fats.

Be careful

Common side effects are diarrhea, nausea, cramps and bloating, especially at large doses, and serious allergic reactions are uncommon but possible: stop and get help for trouble breathing or facial swelling. Avoid it if you are allergic to coconut or palm, and ask a doctor first if you are pregnant or have liver or gallbladder disease, since data are limited. Check your LDL cholesterol after starting it, and count its roughly 120 calories a tablespoon.

Avoid if: coconut allergy; liver disease; gallbladder disease; pregnancy.

Mixing with other things

Use caution
Statins (Lipitor, Zocor, Crestor)
High doses may raise LDL (bad) cholesterol, which could work against a statin. Have cholesterol checked if you take one.
Worth knowing
Diabetes medicine (metformin, insulin, glipizide, Ozempic)
Few studies have tested MCT oil with diabetes medicines. Check blood sugar if you start it.

The honest take

MCT oil is a real medical tool for people who cannot absorb normal fats well. For healthy people, claims about energy, weight and memory are early or not supported. A small amount taken with food, plus a check of your cholesterol, is a sensible way to use it.

Sources

Each “See the research” link opens PubMed, the U.S. National Library of Medicine's index of medical studies, showing only trials and reviews done in people. The number tells you how much a use has been tested, not whether it worked. The proof rating tells you that.

Study counts checked October 2026.