MCT oil is a supplement often added to smoothies, bulletproof coffee and salad dressings.
As the name suggests, medium-chain triglyceride (MCT) oil contains medium-length chains of fats called triglycerides. Due to their shorter length, MCTs are easily digested and many health benefits are linked to the way your body processes these fats.
MCT oil is most commonly extracted from coconut oil, as more than 50% of the fat in coconut oil comes from MCTs. These fats are also found in many other foods, such as palm oil and dairy products (1).
Four different types of MCTs exist, of which caprylic and capric acid are most commonly used for MCT oil. In some cases, these specific types have unique benefits.
Here are 7 science-backed benefits you can get from adding MCT oil to your diet.
There are several reasons why MCT oil may be beneficial when you’re trying to lose weight.
MCT oil has been shown to increase the release of two hormones that promote the feeling of fullness in the body: peptide YY and leptin (2).
It may even be better than coconut oil in keeping you full. One study found that people taking two tablespoons of MCT oil as part of their breakfast ended up eating less food for lunch compared to those taking coconut oil (3).
The same study also discovered a lower rise in triglycerides and glucose with MCT oil, which may also influence the feeling of fullness.
Your body can use MCT oil as an instant source of energy, making it unnecessary to store fat for this purpose. Nevertheless, it’s important to note that your body may adapt to this dietary change, leading to only temporary results (6, 10).
MCTs can be converted into ketones, which are produced from the breakdown of fat when carb intake is low. If you’re following a ketogenic diet, which is very low in carbs yet high in fat, then taking MCT oil can help you stay in the fat-burning state known as ketosis.
Lastly, your gut environment is very important when it comes to your weight. MCT oil can help optimize the growth of good bacteria and support the gut lining, which could also help you lose weight (11).
Summary MCT oil may support weight loss by increasing fullness, fat loss, energy burning, ketone production and by improving your gut environment.
MCT oil has been dubbed a super fuel since your body absorbs MCTs more rapidly than long-chain triglycerides (LCTs), which contain more carbons in their fatty acid chains (7).
Due to their shorter chain length, MCTs travel straight from the gut to the liver and do not require bile to break down like longer-chain fats do (12).
In the liver, the fats are broken down to be either used as fuel or stored as body fat.
Since MCTs easily enter your cells without being broken down, they can be used as an immediate source of energy (13).
When you’re on a ketogenic diet, MCTs can also be converted into ketones in the liver.
These ketones can pass through your blood-brain barrier, making them a convenient source of energy for your brain cells.
Summary MCT oil is easily absorbed and transported throughout the body. It can be used as an instant source of energy or can be converted into ketones to fuel your brain.
MCT oil has gained popularity amongst athletes.
During exercise, rising lactate levels can negatively impact exercise performance.
Interestingly, MCTs may help reduce lactate buildup. One study found that athletes who took 6 grams or about 1.5 teaspoons of MCTs with food before cycling had lower lactate levels and found it easier to exercise, compared to those taking LCTs (14).
Furthermore, the study found that taking the MCT oil before exercise may help you use more fat instead of carbs for energy.
At the very least, the results of one animal study suggest that MCT oil does not negatively affect exercise performance, which is encouraging (18).
Summary MCT oil can increase fat burning and reduce the need for carbs during exercise. However, it is unclear whether this translates to improved exercise performance.
While the ketogenic diet has gained popularity amongst people wishing to lose weight, it was first introduced as a way of managing epilepsy.
Scientists found that fasting increases ketone production and that this may reduce the frequency of epileptic seizures (20).
Since MTCs can be converted into ketones, they may be beneficial in managing epilepsy.
However, the type of MCT may be important. One test-tube study showed that the MCT capric acid improved seizure control better than a widespread anti-epileptic drug (21).
Another study in rats found that the same MCT blocked receptors in the brain that cause seizures, though more human studies are needed (22).
In addition, it’s important to note that a ketogenic diet is not for everyone and can be challenging to follow long term (23).
If you are considering a ketogenic diet to help manage your epilepsy, talk to your doctor or nutrition professional first.
Alzheimer’s disease impairs your brain's ability to use sugar (24).
An MCT ketogenic diet offers an alternative energy source: ketones. This allows brain cells to survive better. It also blocks a receptor in the brain that causes memory loss (19).
One study found that a single dose of MCTs improved short-term cognition in 20 people with Alzheimer’s disease with a certain gene type, namely APOE ɛ4-negative (25).
While genetic factors play a role, evidence suggests that 20–70 grams of supplemental MCTs that include caprylic or capric acid can modestly improve the symptoms of mild-to-moderate Alzheimer’s (24).
Overall, the benefits of MCT oil in Alzheimer’s disease are promising, but longer and larger scale studies are needed (25).
MCT oil may also help children with autism (26).
One study found positive overall improvements when a ketogenic diet was followed for 6 months (27).
Another study found that adding MCTs to a ketogenic and gluten-free diet substantially improved autism behaviors for 6 of the 15 children involved (26).
Because autism is a spectrum condition, it can affect people in different ways.
This means that adding MCT oil to your child’s diet may help to varying degrees or may show no positive effects. More research is needed here, as well (28).
If you are considering a ketogenic diet to help manage your child’s autism, talk to your doctor or nutrition professional first.
Summary MCT oil may improve brain function, which could have benefits for people with epilepsy, Alzheimer’s disease and autism.
A test-tube study also showed that coconut oil reduced the growth of a disease-causing bacteria called Clostridium difficile (30).
Coconut oil’s ability to reduce yeast and bacterial growth may be due to the caprylic, capric and lauric acid in MCTs (30).
MCTs themselves have also been shown to suppress the growth of a widespread infectious fungus in hospitals by up to 50% (33).
However, note that most of the research on MCTs and immune support has been conducted via test-tube or animal studies. High-quality human studies are needed before stronger conclusions can be made.
Summary MCT oil contains fatty acids that have been shown to reduce the growth of yeast and bacteria. Overall, MCTs may have a variety of antimicrobial and antifungal effects.
Heart disease is a growing problem.
Some factors that increase your risk include high cholesterol, blood pressure, inflammation, being overweight and smoking.
MCT oil has been shown to support weight and fat loss. This may, in turn, help reduce your risk of heart disease (1).
A study of 24 overweight men found that combining MCT oil with phytosterols and flaxseed oil for 29 days reduced total cholesterol by 12.5%. However, when olive oil was used instead, the reduction was only 4.7% (34).
The same study also found better reductions in LDL or “bad” cholesterol when the MCT oil mixture was added to their diet (34).
Moreover, MCT oil can also increase the production of heart-protective HDL or “good” cholesterol (35).
It can even significantly reduce C-reactive protein (CRP), an inflammatory marker that increases the risk of heart disease (36).
Summary MCT oil may reduce heart disease risk factors such as weight, cholesterol and inflammation. Adding it to your diet could help lower your risk of heart disease.
Most people with type 2 diabetes are overweight or obese, which makes diabetes harder to manage. However, MCTs have been shown to reduce fat storage and increase fat burning (40).
One small Chinese study of 40 people with diabetes found that those who consumed MCT oil daily had significant reductions in body weight, waist circumference and insulin resistance, compared to those taking corn oil containing LCTs (39).
However, the same study did not find any effect of MCTs on reducing fasting blood sugar levels (41).
Therefore, other factors such as timing and the amount of food eaten may influence the effects of MCT oil.
Summary MCT oil may help manage diabetes by reducing fat storage and increasing fat burning. It may also help you control your blood sugar.
Although MCTs are considered safe, they may have some disadvantages (42).
May Stimulate the Release of Hunger Hormones
People who took more than 6 grams of MCTs per day produced more of these hormones than those who had less than 1 gram per day.
However, it is unclear whether the increase in these hormones actually causes you to eat more.
High Doses Could Lead to Fat Buildup in the Liver
High doses of MCT oil may increase the amount of fat in your liver in the long term.
One 12-week study in mice found that a diet in which 50% of the fats were MCTs increased liver fat. Interestingly, the same study also found that MCTs reduced total body fat and improved insulin resistance (46).
However, keep in mind that high doses of MCT oil, such as those in the study above, are not recommended. Overall, more research is needed on the long-term effects of MCT oil.
MCTs are high in calories and usually only make up about 5–10% of your total calorie intake. If you are trying to maintain or lose weight, you should consume MCT oil as part of your total amount of fat intake and not as an additional amount of fat.
Summary MCT oil increases the release of hunger hormones, which could lead to increased food intake. In the long term, it may also increase the amount of fat in your liver.
Taking MCT oil could have many benefits and very few risks.
For starters, it contains fatty acids that can promote weight loss by reducing body fat, increasing fullness and potentially improving your gut environment.
MCTs are also a great source of energy and may fight bacterial growth, help protect your heart and aid in managing diabetes, Alzheimer’s disease, epilepsy and autism.
Potential drawbacks may include increased hunger and possible fat accumulation in your liver. However, as long as you keep to 1–2 tablespoons per day and use it to replace — not add — to your normal fat intake, any negative side effects are unlikely.
At the end of the day, MCT oil is a convenient way to take advantage of all the health benefits MCTs have to offer.