Lightweight oils with small molecules are best for low porosity hair as they can penetrate the tightly bound cuticle. Grapeseed oil, argan oil, and apricot kernel oil are excellent choices that provide moisture without causing buildup.

Avoid heavy, thick oils like coconut oil, shea butter oil, and olive oil, as they tend to sit on top of low porosity hair, causing buildup and preventing moisture absorption. These oils have larger molecules that struggle to penetrate the hair shaft.