Table of Contents
- Introduction
- What is MCT Oil and How Does It Work?
- Common Negative Effects of MCT Oil
- Impact on Heart Health and Cholesterol
- Who Should Exercise Caution?
- How to Mitigate Negative Effects
- Comparing MCT Oil Forms
- The Benefits: Why People Use It Despite Potential Side Effects
- Why Quality Matters
- Finding the Right Balance for Your Routine
- Purpose and Legacy
- FAQ
Introduction
If you have spent any time in the wellness or keto space, you have likely heard about the benefits of medium-chain triglycerides, better known as MCT oil. Many people swear by adding a splash to their morning coffee for a mental boost or using it to fuel long-distance training sessions. It has a reputation for providing quick, clean energy without the crash associated with sugar.
However, like any supplement that actually works, your body needs to adjust to it. You might be wondering about the potential downsides or if there are any negative effects of MCT oil that you should watch out for before making it a staple in your routine. At BUBS Naturals, we believe in being direct about what you are putting into your body, which means looking at the science behind both the benefits and the potential side effects.
This guide will break down what MCT oil is, why it sometimes causes digestive discomfort, and how you can use it to support your goals without the unwanted trips to the bathroom. We will also cover specific health considerations so you can decide if it is the right fit for your lifestyle.
What is MCT Oil and How Does It Work?
To understand the side effects, we first need to understand the chemistry. Most fats in our diet are long-chain triglycerides (LCTs). These are found in foods like olive oil, nuts, and avocados. Because they have a long "tail" of carbon atoms (usually 13 to 21), your body has to work hard to break them down. They require bile and pancreatic enzymes to digest, and they eventually travel through your lymphatic system before your body can use them for fuel.
MCTs are different. They typically have 6 to 12 carbon atoms. Because they are shorter, they are absorbed almost immediately. Instead of going through the long digestive process, they head straight to your liver. Once there, your liver can convert them into ketones — a highly efficient fuel source that your brain and muscles can use for energy.
Most high-quality MCT oils, like the ones we use, focus on two specific types of fatty acids: Caprylic Acid (C8) and Capric Acid (C10). These are the "goldilocks" of MCTs because they are short enough to be metabolized quickly but stable enough to be used in various recipes. While they are often derived from coconut oil, MCT oil is a concentrated version that removes the long-chain fats, leaving only the fast-burning fuel. For a deeper look at how powdered MCT is made, read what MCT oil powder is made of.
Creamers
Common Negative Effects of MCT Oil
For most people, MCT oil is safe and well-tolerated. However, because it is processed so differently than other fats, your body can experience some "protest" if you jump in too fast. Here are the most common negative effects reported by users.
Digestive Discomfort and "Disaster Pants"
The most frequently discussed side effect is digestive distress. In the keto community, this is sometimes jokingly referred to as "disaster pants." Because MCT oil is absorbed so rapidly, it can have an osmotic effect in the gut. This means it pulls water into the intestines.
If you take too much at once, especially on an empty stomach, your body might try to flush it out quickly. This can lead to:
- Loose stools or diarrhea
- Stomach cramping
- Bloating and gas
- Nausea or a "heavy" feeling in the gut
This is generally not a sign that something is wrong with the oil itself, but rather a sign that your digestive system isn't yet equipped to handle that specific concentration of medium-chain fats.
Potential for Weight Gain if Not Balanced
MCT oil is a fat, and fat is calorie-dense. Every gram of fat contains nine calories. While MCTs may support metabolism and satiety, they are not "free" calories. If you add two tablespoons of MCT oil to your daily routine without adjusting your other food intake, you are adding roughly 260 calories to your day.
For someone trying to maintain or lose weight, this can lead to unintentional weight gain. The goal should be to replace other less-functional fats in your diet with MCTs, rather than simply stacking them on top of everything else you eat.
Increased Hunger in Some Individuals
While many people report that MCT oil helps them feel full longer (due to the release of peptide YY and leptin, two hormones that promote fullness), a small subset of users reports the opposite. Some studies suggest that in certain individuals, MCTs might stimulate the release of ghrelin, the "hunger hormone." If you find yourself reaching for snacks an hour after your MCT-boosted coffee, you may be one of the people who reacts this way.
Quick Answer: The most common negative effects of MCT oil are digestive issues like diarrhea, gas, and stomach cramps, which usually happen when starting with too high a dose. Other potential concerns include weight gain if total calorie intake isn't managed and varied responses in cholesterol levels for certain individuals.
Impact on Heart Health and Cholesterol
There is a common debate regarding whether any saturated fat is "bad" for the heart. MCT oil is a saturated fat, but it does not behave the same way as the saturated fats found in a greasy cheeseburger.
The LDL and HDL Balance
Research on MCT oil and cholesterol has shown mixed results. Some studies indicate that MCT oil can improve heart health markers by increasing "good" HDL cholesterol and reducing the size of "bad" LDL particles, making them less likely to cause arterial issues.
However, everyone’s genetics are different. Some people are "hyper-responders" to saturated fats. For these individuals, adding concentrated MCT oil to their diet may cause a significant spike in LDL cholesterol. If you have a history of heart disease or high cholesterol, it is always a good idea to monitor your blood work when making major changes to your supplement routine.
Heart Palpitations
Though rare, some users report feeling heart palpitations or a racing heart after taking MCT oil. This is often linked to the rapid rise in ketones and the metabolic "rev-up" that occurs. If you are sensitive to stimulants or have an underlying heart condition, this rapid energy shift might feel like a flutter in your chest. If this happens, it is usually a sign to lower your dose or consult with a healthcare provider.
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Join The ClubWho Should Exercise Caution?
While MCT oil is a versatile tool for many, certain groups should be more careful when introducing it.
- Individuals with Liver Issues: Since MCTs are processed primarily in the liver, those with advanced liver disease should talk to their doctor first. In some rare cases, very high doses of MCTs have been linked to fat accumulation in the liver in animal studies, though human evidence is limited.
- Those with Fat Malabsorption Issues: If your body already struggles to process fats due to conditions like pancreatitis or gallbladder issues, the rapid absorption of MCTs might still be taxing on your system.
- Type 1 Diabetics: While MCTs can support blood sugar management in some, the production of ketones is a delicate balance for those with Type 1 diabetes. It is essential to work closely with a medical professional to avoid any risk of ketoacidosis.
Myth: MCT oil is exactly the same as coconut oil.
Fact: While MCT oil is derived from coconut oil, it is much more concentrated. Coconut oil is about 50% lauric acid (C12), which behaves more like a long-chain fat. High-quality MCT oil removes the lauric acid to focus on C8 and C10, providing much faster energy.
For additional safety considerations, see this guide to who should not use MCT oil.
How to Mitigate Negative Effects
The good news is that almost all the common negative effects of MCT oil are preventable. It comes down to how you introduce it and the quality of the product you choose.
The "Low and Slow" Approach
The number one mistake people make is taking a full tablespoon on day one. If your gut isn't used to it, you will likely experience discomfort. Instead, start with one teaspoon per day. Stay at that dose for three to four days. If you feel fine, move up to two teaspoons. Gradually working your way up to a full tablespoon over the course of two weeks allows your digestive enzymes to catch up.
Take It With Food
Taking MCT oil on a completely empty stomach is the fastest way to trigger an upset stomach. If you are adding it to your morning coffee, try to have it alongside a small meal or at least some protein. The presence of other nutrients slows down the gastric emptying process, giving your intestines more time to absorb the oil without the osmotic "flush."
Use a Powdered Version
Many people find that liquid MCT oil is too harsh on their stomachs. This is where a high-quality MCT Oil Creamer can be a total shift in your routine. MCT powders are created through a process called spray drying, where the oil is encapsulated into a carrier.
Our MCT Oil Creamer is a great example of this. Because the oil is bound to a fiber source, it is often much easier on the digestive tract than straight liquid oil. It also mixes better into coffee and shakes, providing a creamy texture without the oily film on top.
Key Takeaway: Digestive side effects from MCT oil are almost always dose-dependent. By starting with a small amount and using a powdered form, most people can bypass the typical "stomach protest" and enjoy the energy benefits.
Comparing MCT Oil Forms
| Feature | Liquid MCT Oil | MCT Oil Powder |
|---|---|---|
| Digestion | Can be harsh on sensitive stomachs | Generally gentler and easier to digest |
| Portability | Hard to travel with; prone to leaks | Easy to scoop; travel-friendly |
| Mixability | Can leave an oily film on drinks | Dissolves easily; adds creaminess |
| Cooking | Best for low-heat dressings | Best for coffee, shakes, and baking |
For more guidance on choosing between formats, read how to choose the best MCT oil for your needs.
The Benefits: Why People Use It Despite Potential Side Effects
If there are potential side effects, why is MCT oil so popular? For many, the benefits far outweigh the initial adjustment period. When used correctly, MCT oil is one of the most effective ways to support a high-performance lifestyle.
Mental Clarity and Focus
Your brain is a massive consumer of energy. While it usually runs on glucose, it is actually very efficient at burning ketones. Many people report that MCT oil provides a "lifting of the fog." Because MCTs can cross the blood-brain barrier quickly, they provide a near-instant fuel source for cognitive tasks.
Sustained Physical Energy
For athletes, especially those doing endurance work like hiking, cycling, or long-distance running, MCTs offer a way to fuel without the blood sugar spikes and crashes of gels or sugary sports drinks. It provides a steady stream of energy that can help preserve your glycogen stores for when you really need them.
Metabolic Support
MCTs have a high thermic effect. This means your body uses more energy to process them compared to other fats. While it isn't a "weight loss miracle," it can be a helpful tool in a well-rounded nutrition plan by supporting fat oxidation and potentially helping you feel more satisfied between meals.
Learn more about the potential uses and benefits of MCT Oil Powder.
Why Quality Matters
Not all MCT oils are created equal. Some lower-quality brands use palm oil harvested in ways that are destructive to the environment, or they use chemical solvents like hexane to extract the oil. Others might include "fillers" or cheaper long-chain fats that defeat the purpose of the supplement.
We take a different approach. We focus on clean, coconut-sourced MCTs that are third-party tested. When you use a product that is NSF for Sport certified, you know that what is on the label is exactly what is in the container — no BS, no fillers, just the functional fats your body needs. This focus on purity also reduces the likelihood of negative reactions caused by additives or low-grade processing.
Finding the Right Balance for Your Routine
Incorporating MCT oil is about more than just adding a scoop to your drink; it's about listening to your body. Some days, you might find that you need the extra boost for a morning of back-to-back meetings. Other days, if you’re feeling a bit run down or your digestion is off, you might want to skip it.
Wellness isn't a one-size-fits-all protocol. It’s an adventure in discovering what makes you feel and perform your best. If you find that liquid oil doesn't sit right with you, try our Butter MCT Oil Creamer for a rich, buttery flavor that is designed to be easy on the gut. The goal is to equip you with tools that work with your body, not against it.
Bottom line: While MCT oil can cause temporary digestive upset if taken in large doses too quickly, these effects are easily managed by starting with a small amount and choosing high-quality, powdered options.
Purpose and Legacy
At BUBS Naturals, our commitment to clean, effective supplements is rooted in something deeper than just health trends. We were founded to honor the legacy of Glen "BUB" Doherty, a Navy SEAL and hero who lived a life defined by adventure and helping others. Every product we make, including our MCT oil and electrolytes, is designed to help you live a life that is "Great to Be Alive."
In keeping with that mission, we donate 10% of all profits to veteran-focused charities. When you choose a supplement that is clean, science-backed, and purpose-driven, you aren't just supporting your own wellness — you’re contributing to a larger cause. Learn more about the BUBS story and 10% Rule.
Whether you are looking to sharpen your focus, fuel your next outdoor adventure, or simply find a cleaner way to start your day, understanding how to use MCT oil properly is the first step. Start small, listen to your gut, and focus on the quality of your ingredients.
FAQ
Does MCT oil cause weight gain?
MCT oil is high in calories, so if you add it to your diet without reducing calories elsewhere, it can contribute to weight gain. However, because it may help increase satiety and metabolism, many people use it effectively as a replacement for other fats to support weight management.
Can MCT oil cause heart palpitations?
Some users report a racing heart or palpitations, which may be linked to the rapid metabolic shift and increase in ketone production. This effect is usually temporary and often happens with high doses; if you have a heart condition, it is best to consult your doctor before use.
Is it okay to take MCT oil on an empty stomach?
Taking MCT oil on an empty stomach is the most common cause of digestive issues like nausea or diarrhea. It is generally recommended to take it with a meal or mix it into a drink that contains other nutrients to buffer the absorption and protect your stomach.
How much MCT oil is too much?
Most people find their "sweet spot" between one and three tablespoons per day, but taking more than four to seven tablespoons can lead to significant digestive distress and unwanted calorie intake. Always start with a single teaspoon and increase the amount slowly over several days.
