Blue Light

What It Is

High-energy visible (HEV) light in the 380–450nm wavelength range, emitted by the sun (the largest source), LED screens, smartphones and indoor lighting. Evidence increasingly supports topical and biological effects: blue light generates reactive oxygen species (ROS) and reactive nitrogen species (RNS) in skin, stimulates melanin production (particularly relevant for Fitzpatrick IV–VI skin tones, causing visible hyperpigmentation from prolonged screen exposure), may impair skin barrier function, and suppresses melatonin production (disrupting circadian rhythm). The extent of screen-derived blue light damage relative to UV is an active area of research.

Key Context

Mitigation strategies: topical antioxidants (Vitamin C, E, ferulic, resveratrol — all have demonstrated efficacy against HEV-induced oxidative stress); some iron oxide-containing mineral sunscreens provide visible light protection; blue-light-blocking screen filters; limiting evening screen exposure to protect melatonin and circadian rhythm.

Learn More

• Science Deep Dives
• Vitamin C + E + Ferulic