The mechanism behind Squalene is precise: Naturally found in sebum; antioxidant in skin; reduces TEWL; precursor to squalane. That specificity is what separates it from broader-category ingredients that work in less targeted ways.
The scientific name is Squalene. Naturally found in sebum; antioxidant in skin; reduces TEWL; precursor to squalane. This mechanism is consistent across properly formulated products, which means the real variable is concentration and delivery system.
Typical working concentration is 1–5%. Best suited to all skin types skin. Primary applications: skin identical moisturiser, antioxidant.
Works well with: Vitamin E (protects from oxidation). Avoid combining with: Avoid using alone — oxidises readily.
Unstable form — oxidised squalene linked to acne; squalane (hydrogenated) is preferred.