MCT oil is the standard carrier for CBD tinctures for one simple reason: CBD isolate dissolves in it cleanly and stays dissolved, even at high concentrations. It's thin enough to measure by the drop, stable enough to sit on a shelf for months, and neutral enough not to fight the flavor of the CBD itself.
What MCT oil actually is
MCT stands for medium-chain triglycerides — fats with carbon chains of 6 to 12 atoms, typically fractionated from coconut or palm kernel oil. Those short chains are why the oil behaves differently from most cooking oils: it stays liquid at room temperature, has a very light mouthfeel, and is far more resistant to oxidation than polyunsaturated oils like olive or hemp seed. Those properties are exactly what a tincture carrier needs.
MCT vs olive oil vs hemp seed oil
| Carrier | CBD solubility | Stability | Viscosity | Flavor |
|---|---|---|---|---|
| MCT oil | Excellent — holds high concentrations | High — resists rancidity | Thin — easy to measure and pour | Neutral |
| Olive oil | Good | Medium — goes rancid sooner | Thicker | Olive taste |
| Hemp seed oil | Good | Lower — most perishable | Medium | Nutty/grassy taste |
Why this matters when you make your own
If you're mixing CBD isolate into oil yourself, the carrier decides how easy the job is. MCT's thin viscosity means a measure-and-pour bottle works reliably — you get consistent drops and accurate doses without a scale. Olive oil's thickness makes drops bigger and less consistent, and its shorter shelf life means you should make smaller batches. There's no evidence that any carrier makes CBD absorb "better" — researchers note carrier choice is about formulation, not potency — but MCT is the most forgiving to work with.
What it costs to add the oil yourself
- Store-bought MCT oil: roughly $0.05–0.15 per ml — a few dollars for a month of tincture.
- Store-bought CBD tincture: $0.10–0.20/mg — the CBD is worth about $0.50 in a $100 bottle; you're paying for the label.
- Simple Tinctures concentrate: $0.006/mg — isolate already dissolved in MCT, ready to pour. Add your own MCT to finish it and you're at roughly 1/20th the store price. Full math on our cost-per-mg page.