Why MCT Oil Is in Your CBD Drops (and How It Compares With Other Carrier Oils)

CBD drops need a carrier oil because CBD is a fat-loving molecule that does not dissolve in water. The carrier holds the CBD in solution, makes a measurable dose possible, and gives your body some fat to absorb it with. MCT oil, a refined fraction of coconut or palm kernel oil, is a common choice because it is liquid, nearly tasteless, and very resistant to going rancid.

Proof Comfort Drops, Sleepy Drops, and Pets Drops all use MCT coconut oil as the carrier. That is a formulation choice with real reasons behind it, and I want to be straight about which reasons are well supported and which are not.

The short version: fat clearly helps CBD absorb. Whether MCT helps more than other oils is not settled, and the little human data that exists does not show MCT as the winner. MCT's strongest advantages are stability, taste, and consistency.

Key takeaways

• CBD dissolves in fat, not water, so oil drops need a carrier oil.
• MCT oil is made mostly of caprylic (C8) and capric (C10) fatty acids. It is fully saturated, so it resists oxidation better than hemp seed or olive oil.
• Taking CBD with fat raises how much reaches the blood, but research does not show MCT outperforms long-chain oils such as olive or sesame oil.
• Coconut was removed from the FDA's tree nut list in January 2025, but coconut allergy exists. If you react to coconut, ask your allergist before using MCT-based products.

What a carrier oil does

A dropper of pure CBD is not practical: pure CBD is a crystalline solid, and distillate is a thick paste. Dissolving a known amount in a known volume of oil is what lets a label promise a dose. For our Comfort Drops, 1,000 mg of CBD in a 15 ml bottle works out to about 67 mg per ml, so a 0.5 ml dose is about 33 mg.

The oil also matters once you swallow. CBD is highly lipophilic (it has a logP around 6.3, meaning it strongly prefers fat to water), and a 2020 review in Clinical Pharmacokinetics explains that part of its oral absorption likely runs through the intestinal lymphatic system, carried in chylomicrons, the fat particles your gut builds from long-chain fats (Franco et al. 2020). That route partly bypasses the liver's first-pass metabolism.

MCT vs hemp seed oil vs olive oil

MCT oil. Medium-chain triglycerides are built mainly from caprylic (C8) and capric (C10) acids, with smaller amounts of C6 and C12 (Traul et al. 2000). Because those fatty acids are saturated, they have no double bonds for oxygen to attack, which is the main reason MCT resists rancidity. It is also colorless and close to flavorless.

Hemp seed oil. Pressed from the seed, it is over 90 percent unsaturated fat, with polyunsaturated fat around 76 to 83 percent, mostly linoleic and alpha-linolenic acid (Chen et al. 2010). That makes it nutritious as a food oil but more prone to oxidation in a bottle. Hemp seed oil is not CBD oil: the FDA notes that hemp seeds "do not naturally contain THC or CBD." Our hemp oil vs CBD oil vs hemp seed oil guide covers the labeling confusion.

Olive oil. About 73 percent monounsaturated fat, mostly oleic acid, per USDA FoodData Central. It is more stable than hemp seed oil and is a long-chain fat, but its flavor comes through in drops.

Why fat matters for absorption, and what the research says about MCT

The evidence that fat helps is strong and consistent. In rats, giving CBD with lipids raised blood exposure about threefold compared with a lipid-free formulation (Zgair et al. 2016). In people, taking CBD with a high-fat meal raises blood levels several-fold compared with fasting; our CBD bioavailability guide walks through those studies.

The evidence that MCT specifically is the best fat is weak:

• Chemistry. Medium-chain fatty acids are not built into chylomicrons; they travel from the gut to the liver through the portal vein, while long-chain fats form chylomicrons and enter the lymph (Schönfeld and Wojtczak 2016). Since the lymphatic route depends on long-chain fats, MCT on its own may not do much to steer CBD that way.
• Lab and animal studies. A 2023 study of CBD emulsions measured bioavailability in a simulated digestion model as highest with a long-chain oil (43 percent), then a 50:50 MCT and long-chain blend (39 percent), then MCT (33 percent), and its animal experiments also favored the long-chain and blended oils (Wang et al. 2023). A rat study concluded the effect of MCT versus long-chain oils "is not straightforwardly anticipated" and depends on the formulation (Izgelov et al. 2020).
• Human data. In an 11-person crossover study, a self-emulsifying formulation produced about 1.5 times the CBD exposure of a plain MCT solution (De Prá et al. 2021).

So why use MCT? Because a carrier has several jobs, and absorption is only one. MCT keeps the oil from going rancid over a bottle's life, tastes of almost nothing when held under the tongue, and stays pourable, which makes it easy to measure consistently. And because you are likely to eat food with fat anyway, the meal you take it with probably matters as much as the carrier.

A note on coconut allergy

In January 2025, the FDA published the fifth edition of its food allergen guidance and removed coconut from its list of tree nuts, so coconut no longer has to be declared as a major food allergen (FDA). That is a labeling change, not a statement that coconut cannot cause reactions. Coconut is botanically a fruit, and most people with tree nut allergies can eat it, but the American College of Allergy, Asthma and Immunology notes that allergic reactions to coconut have been documented (ACAAI).

MCT oil is a refined fat, and we are not aware of data on how much coconut protein, if any, survives refining. If you have ever reacted to coconut, or have a tree nut allergy and have not eaten coconut before, talk to your allergist before using any MCT-based product. For pets with known food allergies, talk to your veterinarian.

FAQ

Is MCT oil the same as coconut oil?

No. Whole coconut oil is about 42 percent lauric acid (C12), with only about 7 percent C8 and 5 percent C10, per USDA data. MCT oil is a refined fraction concentrated in C8 and C10.

Does MCT oil make CBD work faster?

There is no good evidence that it does. Speed of onset depends more on how you take the drops (held under the tongue or swallowed) and whether you have eaten.

Is hemp seed oil a better carrier because it comes from hemp?

Not for CBD drops. Hemp seed oil contains essentially no CBD of its own, and its polyunsaturated fats oxidize faster in the bottle. It is a good food oil; it is just not the most stable carrier.

Should I refrigerate MCT-based CBD oil?

No. Cold thickens carrier oils and makes dosing less consistent. A cool, dark cupboard is better; see does CBD oil expire.

Related reading

• CBD bioavailability explained
• Does CBD oil expire?
• How to use CBD tinctures
• Hemp oil vs CBD oil vs hemp seed oil
• How CBD is extracted
• CBD Comfort Drops

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.