What it is
Retinol is the alcohol form of vitamin A and a widely used cosmetic skin-conditioning ingredient. In leave-on products it is included for its conditioning role, and it is sensitive to light and air, so formulas are designed to protect it. Its presence in a sunscreen pairs a conditioning ingredient with daytime sun protection.
Safety & warnings
Retinol can cause dryness, redness, peeling, or stinging, particularly when first introduced or used at higher levels, and these effects are more likely on sensitive skin. Skin using vitamin A products may be more reactive to sun, so daytime sun protection is commonly advised. It is degraded by light and air, so packaging and formulation matter for tolerability and performance.
Origin & sourcing
Retinol can be produced synthetically or derived from animal sources; the cosmetic-grade material is most commonly manufactured synthetically to ensure purity and stability.
History
Vitamin A was identified in the early twentieth century, and retinol later became a well-established cosmetic ingredient widely incorporated into skincare formulations.
Questions everyone asks
Why combine retinol with a sunscreen?
Retinol is added as a conditioning ingredient, and pairing it with a sunscreen provides daytime sun protection in the same product, which is convenient for routines that include vitamin A.
Can retinol make skin more sensitive to the sun?
Skin using vitamin A ingredients can be more reactive to sunlight, which is one reason daytime sun protection is generally recommended alongside retinol use.