Pick the wrong carrier oil and it does not matter how good your active ingredient is — it never gets where it needs to go, and you are left with a greasy scalp and a slick pillow. The carrier is half the formula. We chose coconut MCT, and the reason is chemistry, not marketing.
Ordinary coconut oil — the solid white kind in the jar — is a mix of many fatty acids of different lengths. MCT stands for medium-chain triglycerides: the lighter, medium-length fractions, separated out from the rest. Whole coconut oil is heavy, turns solid below about 24°C, and includes long, waxy molecules that mostly sit on the surface. MCT keeps only the light fractions. The result is a clear, thin oil that stays liquid at any room temperature and feels nothing like the jar.
On the scalp, weight decides everything. A heavy oil forms an occlusive film: it can clog around the follicle opening, trap the very flakes and sebum you are trying to move, and refuse to wash out without stripping. That is the opposite of what a scalp wants. A light oil spreads thin, lets the skin breathe, carries its active down to where the follicle sits, and rinses clean. MCT's small molecular size is exactly what makes it absorb instead of pool.
Because the heavy fractions are gone, MCT does not solidify in a cold Dutch bathroom. Whole coconut oil turns to a hard paste below room temperature, so a bottle of it is unusable half the year here — you would be warming it in your hands before every use. MCT pours the same in January as in July. A small thing, but it is the difference between a ritual you keep and a bottle you abandon on the shelf.
MCT is also nearly odourless and very stable — it resists going rancid far better than many botanical oils, which is part of why it has such a long shelf life. That neutrality is useful: it lets the rosemary come through honestly, and it gives the active a clean, well-behaved base to travel in rather than competing with a heavy oil of its own. The carrier should serve the active, not fight it.
Source: Rele AS, Mohile RB. Effect of mineral oil, sunflower oil and coconut oil on prevention of hair damage. Journal of Cosmetic Science, 2003. PubMed.
The carrier in Nourishing. Nourishing uses lightweight coconut MCT as its base, carrying rosemary at a researched concentration — light enough to absorb, stable enough to last, and liquid in any weather. Curious how the rosemary works? Read rosemary: the quiet hero.
