Studies On MCT Oil And Cholesterol Levels: What Scientists Found
MCT oil has a mixed but mostly reassuring evidence base for cholesterol: the best-known 2021 meta-analysis of randomized trials found no meaningful change in total cholesterol, LDL cholesterol, or HDL cholesterol overall, but it did show a small rise in triglycerides, and results depended on what fat it was compared against.
What the studies found
The strongest summary comes from a 2021 systematic review and meta-analysis in the Journal of Nutrition, which pooled seven randomized trials and found that MCT oil did not significantly affect total cholesterol, LDL cholesterol, or HDL cholesterol, while triglycerides increased slightly. The reported pooled effects were small, with total cholesterol at 0.04 mmol/L, LDL at 0.02 mmol/L, HDL at -0.01 mmol/L, and triglycerides at 0.14 mmol/L, suggesting that MCT oil is not a major cholesterol raiser in aggregate but may still influence other lipids.
That same review found an important nuance: the effect changed depending on the comparator oil. When MCT oil was compared with oils rich in unsaturated fats, total cholesterol and LDL tended to rise; when compared with some longer-chain saturated fats, there was evidence of lower values. In other words, the question is not just whether MCT oil changes cholesterol, but what it is replacing in the diet.
Evidence from trials
Individual trials have not all pointed in the same direction, which is why researchers keep revisiting the topic. A randomized crossover study in endurance runners published in 2000 reported higher total cholesterol, LDL cholesterol, and triglycerides after two weeks of MCT oil than after long-chain triglycerides, while HDL did not differ significantly. That study raised early concern that MCT oil could negatively affect the blood lipid profile in some people, even if values stayed within normal ranges.
Later work has been more context-dependent. A 2003 crossover trial in overweight women tested a functional oil blend containing MCTs plus phytosterols and n-3 fatty acids, and it lowered total cholesterol by 9.1% and LDL cholesterol by 16.0% compared with beef tallow, showing that the lipid outcome depends heavily on the full dietary package rather than MCTs alone. That finding is often cited, but it does not isolate MCT oil as the active cholesterol-lowering ingredient because the blend contained several other components known to improve lipids.
How to read the data
For most adults, the available randomized evidence suggests MCT oil is neither a dramatic cholesterol booster nor a proven cholesterol-lowering therapy. The more consistent signal is a small triglyceride increase, which matters more for people already dealing with elevated triglycerides, metabolic syndrome, or high cardiovascular risk.
The most important interpretation is comparative: replacing butter or a fatty meat source with MCT oil may produce a different result than replacing olive oil, canola oil, or other unsaturated fats. Because unsaturated fats generally improve lipid profiles, swapping them out for MCT oil can make cholesterol numbers look worse even if MCT oil itself is not uniquely harmful.
Practical implications
If someone uses MCT oil for energy, appetite control, or ketogenic dieting, the cholesterol question should be part of a broader cardiovascular checkup rather than the only concern. People with high LDL cholesterol, familial hypercholesterolemia, diabetes, or known heart disease should be especially cautious about making MCT oil a large daily fat source without monitoring blood tests.
- MCT oil is usually best treated as a specialty fat, not a default cooking oil.
- Its effect on cholesterol depends on the comparison fat and the rest of the diet.
- Triglycerides may rise slightly, even when LDL does not change much.
- Anyone with lipid concerns should track lab values after dietary changes.
Study snapshot
| Study | Year | Design | Main lipid finding |
|---|---|---|---|
| McKenzie et al. | 2021 | Systematic review and meta-analysis | No significant change in total cholesterol, LDL, or HDL; triglycerides increased slightly. |
| St-Onge et al. | 2000 | Randomized crossover trial | Total cholesterol, LDL, and triglycerides were higher after MCT oil than after long-chain triglycerides. |
| Functional oil trial | 2003 | Randomized crossover trial | A blend containing MCTs, phytosterols, and n-3 fats lowered total cholesterol and LDL versus beef tallow. |
What scientists agree on
The broad consensus is that MCT oil does not consistently raise LDL cholesterol across all studies, but it is also not a reliable cholesterol-improving intervention. The strongest modern synthesis supports a neutral effect on LDL and total cholesterol overall, with a small triglyceride increase and meaningful variation by comparator fat.
"MCT oil does not affect total cholesterol, LDL cholesterol, or HDL cholesterol levels, but does cause a small increase in triglycerides."
Who should be careful
People who already have elevated LDL cholesterol, high triglycerides, or a strong family history of cardiovascular disease should be careful about using large daily amounts of MCT oil. The same caution applies if MCT oil is being added on top of an already high-saturated-fat diet, because the total dietary pattern may matter more than the oil itself.
- Check baseline cholesterol and triglycerides before making MCT oil a habit.
- Use small amounts first if you are trying it for ketogenic or energy reasons.
- Recheck lipids after several weeks or months of consistent use.
- Consider replacing less healthy fats with unsaturated fats instead of adding extra calories.
Bottom line from research
The best available studies suggest that cholesterol levels usually do not change much with MCT oil overall, but triglycerides may rise slightly and the result can differ depending on what MCT oil replaces in the diet. For people focused on heart health, the safest interpretation is that MCT oil is not a cholesterol treatment and should be used selectively, with lab monitoring if intake is regular.
Everything you need to know about Studies On Mct Oil And Cholesterol Levels What Scientists Found
Can MCT oil raise LDL cholesterol?
It can in some comparisons, especially when it replaces unsaturated fats, but the overall meta-analysis found no significant LDL change across studies.
Does MCT oil lower cholesterol?
No strong evidence shows that MCT oil lowers cholesterol on its own, although one mixed-oil trial with phytosterols and n-3 fats improved lipid markers.
Does MCT oil affect triglycerides?
Yes. The 2021 meta-analysis found a small increase in triglycerides, which is the most consistent adverse lipid signal reported so far.
Is MCT oil safe for people with high cholesterol?
It may be acceptable in modest amounts for some people, but those with high LDL or high triglycerides should monitor their blood work and avoid assuming it is heart-neutral for everyone.
What is the most important takeaway?
MCT oil is not a magic lipid booster or a guaranteed cholesterol risk, and its effects depend heavily on the rest of the diet and the fat it replaces.