Mechanism

UV-Induced Photoaging

Cumulative UVA/UVB damage that drives oxidative stress, MMP activation, and DNA changes.

Guideline

What it is

UVA penetrates deeply and drives reactive oxygen species; UVB damages DNA more directly.

Together they activate MMPs that cleave collagen and elastin and accelerate visible aging.

Photoprotection is the most evidence-supported aging-related axis in dermatology.

Primary structural protein of the dermis; declines and fragments with age and UV exposure.

Elastic dermal fibers that allow skin to recoil; degraded with cumulative photoaging.

Imbalance between reactive oxygen species and antioxidant defense; a driver of structural damage.

Ingredient axes

Photoprotection axis

UV filters that reduce cumulative UVA/UVB exposure — the most evidence-supported aging-related axis.

Antioxidant axis

L-ascorbic acid and derivatives — antioxidants associated with photoaging-related care.