Face Oils: What They Do and Who They Suit
Oils seal moisture in. They do not add water, which is why an oil alone is not a moisturiser.
The mechanism
A moisturiser typically combines humectants that draw water into the skin with occlusives that slow its escape. Facial oils do the second job well and the first not at all. Applied to dry skin in dry air, an oil can lock in the absence of water.
Comedogenic ratings, honestly
Coconut oil is highly comedogenic for most faces despite its popularity. Squalane, jojoba, and rosehip sit lower on the scale and suit most skin. Ratings are a guide, not a guarantee, since response is individual.
Practical use
Apply to slightly damp skin, after a water-based product, as the final step of an evening routine. A few drops is the entire dose; more does not do more.
Who should be cautious
Anyone with active acne or fungal conditions, where heavier oils can make things worse rather than better.