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The short version: coconut oil and MCT oil are not the same thing. Coconut oil is mostly lauric acid (C12), which acts like a long-chain saturated fat and raises LDL cholesterol. True MCT oil — mainly caprylic acid (C8) and capric acid (C10) — is LDL-neutral in trials, and is rapidly turned into ketones. MCT is the better-studied tool for ketones and modest weight support; coconut oil is a flavour fat to use in moderation. Neither is a "pour-it-on" health oil.
Why the confusion exists
The mix-up starts with a technicality. Fats are chains of carbon atoms, and the length of the chain changes how the body handles them. "Medium-chain triglycerides" (MCTs) are fats with 6 to 12 carbons. Coconut oil happens to be rich in one of them — lauric acid — so it is often marketed as "an MCT oil" or "nature's MCT." On paper that's almost true. In your bloodstream it is not.
The four medium-chain fatty acids are:
| Fatty acid | Chain | Behaves like |
|---|---|---|
| Caproic (C6) | 6 carbons | True MCT — fast to ketones, but harsh-tasting; used sparingly |
| Caprylic (C8) | 8 carbons | True MCT — the most ketogenic; the "premium" MCT |
| Capric (C10) | 10 carbons | True MCT — ketogenic, slightly slower than C8 |
| Lauric (C12) | 12 carbons | Acts like a long-chain fat — absorbed via lymph, raises LDL |
Here's the catch that the marketing skips: lauric acid (C12) is the borderline case, and biologically it sits on the long-chain side of the fence. It is largely packaged and transported like ordinary dietary fat rather than rushed to the liver. So a fat can be "technically MCT" and still behave like the saturated fat in butter.
What's actually in each oil
| Coconut oil | MCT oil | |
|---|---|---|
| Lauric acid (C12) | ~45–50% | ~0% |
| Caprylic (C8) + capric (C10) | ~12–15% combined | ~100% (often pure C8, or a C8/C10 blend) |
| Longer-chain saturated & unsaturated | ~35% | ~0% |
| Effect on LDL | Raises it | Neutral in trials |
| State at room temp | Solid | Liquid |
MCT oil is made from coconut (or palm kernel) oil by fractionation — distilling out the C8 and C10 and discarding the lauric acid and longer fats. So MCT oil is a purified concentrate, not "concentrated coconut oil." The very component that defines coconut oil (lauric acid) is the part removed to make MCT oil.
The cholesterol question
This is where the two part ways most clearly.
Coconut oil raises LDL. A 2020 meta-analysis of 16 trials found coconut oil raised LDL cholesterol by about 10 mg/dL (≈ 0.27 mmol/L) more than non-tropical vegetable oils — with no proven heart benefit.1 It does also nudge HDL up (~4 mg/dL), but LDL rises more than twice as much, so the ratio worsens — and simply raising HDL has not been shown to protect the heart.
MCT oil is lipid-neutral. A meta-analysis of randomized trials found MCT oil did not significantly change LDL, HDL or total cholesterol (with only a small rise in triglycerides in some comparisons).2 Take away the lauric acid and you take away most of the cholesterol effect. This is the single biggest practical difference between the two oils.
What MCT / C8 is genuinely good for
The real, evidence-backed upsides
- Fast ketone production. MCTs skip the normal fat-digestion route and go straight to the liver, where they're rapidly made into ketones. C8 is the most ketogenic of the four — around 6 g roughly doubles blood β-hydroxybutyrate.3 This is why it's popular on keto diets and in research on brain fuel.
- Modest weight & waist effect. A meta-analysis of 13 randomized trials (749 people) found MCTs produced about 0.5 kg more weight loss and 1.5 cm more waist reduction than long-chain fats.4 Real, but small — and only when MCT replaces other fat, not when it's added on top.
- Quick, gentle energy for people who struggle to digest ordinary fat — which is why MCTs have long been used in clinical nutrition.
The honest limits
- It's still pure fat (~8.3 kcal/g) with no vitamins, polyphenols or fibre. The calories add up fast; it is not a free pass.
- Gut tolerance: too much at once causes cramps, nausea and diarrhoea. Start with ~5 mL and build up.
- Don't cook hot with it — MCT oil has a low smoke point. Use it in coffee, smoothies, dressings or drizzled, not for frying.
- The dramatic claims (appetite "switch-off," major fat-burning) are overstated; the measurable effects are modest.
So which should you use?
They're built for different jobs:
- Cooking and flavour → a little coconut oil is fine where you want that taste and a high smoke point — but treat it like butter (an occasional saturated fat), not a health food, and let olive and rapeseed oil do the daily heavy lifting.
- Ketones, a keto diet, or a small appetite/weight nudge → MCT / C8 oil is the better-evidenced choice, and it won't push your LDL up the way coconut oil does.
- Heart-healthy everyday fat → honestly, neither is the hero. That's still extra virgin olive oil, oily fish, nuts, seeds and avocado.
Bottom line: "MCT" on a coconut-oil label is a marketing half-truth. Coconut oil's main fat (lauric acid, C12) behaves like a long-chain saturated fat and raises LDL; purified MCT / C8 oil is lipid-neutral and is a modest, legitimate tool for ketones and weight support — used in small amounts, never as a "more is better" health oil.
See also: our full fatty acids guide (coconut oil and MCT cards) and how to choose a good olive oil.
References
- Neelakantan N, Seah JYH, van Dam RM. The effect of coconut oil consumption on cardiovascular risk factors: a systematic review and meta-analysis of clinical trials. Circulation, 2020;141:803–814. ahajournals.org
- Panth N, et al. Medium-chain triglyceride oil and blood lipids: a systematic review and meta-analysis of randomized trials. Journal of Nutrition, 2022. sciencedirect.com
- Norgren J, et al. Ketosis after intake of coconut oil and caprylic acid (C8) — with and without glucose: a cross-over study in healthy older adults. 2020. ncbi.nlm.nih.gov
- Mumme K, Stonehouse W. Effects of medium-chain triglycerides on weight loss and body composition: a meta-analysis of randomized controlled trials. J Acad Nutr Diet, 2015. pubmed.ncbi.nlm.nih.gov
This article summarizes nutrition and food-science evidence for education. It is not a substitute for individual medical advice.