Avobenzone

OKsunscreen_filter

A chemical sunscreen filter that absorbs UVA rays.

What is Avobenzone?

CAS Number

70356-09-1

Formula

C20H22O3

Molecular Weight

310.39 g/mol

Also known as: Butyl Methoxydibenzoylmethane, Parsol 1789, BMDBM

What does Avobenzone do for skin?

Absorbs UVA radiation (peak absorption at 357 nm, range 310-400 nm) via keto-enol tautomerism. Primary UVA filter in US sunscreens due to FDA regulatory limitations. Undergoes photodegradation (Norrish type II cleavage) under UV exposure, losing 36-50% efficacy after 1 hour without stabilization. Requires co-formulation with photostabilizers (octocrylene, Tinosorb S) to maintain protection.

Typical concentration: Up to 3% (FDA maximum)

Is Avobenzone safe?

FDA-approved since 1988. Generally recognized as safe. Some studies note potential endocrine disrupting activity at very high concentrations. Photodegradation products may cause contact dermatitis in sensitive individuals.

What does the research say about Avobenzone?

  • Photodegradation of avobenzone

    Sayre et al., Photochemistry and Photobiology, 2005

  • Photostabilization of sunscreen formulations containing avobenzone

    Chatelain & Gabard, Journal of Dermatological Science, 2001

All Ingredients

Frequently Asked Questions

What does Avobenzone do in skincare?+

A chemical sunscreen filter that absorbs UVA rays. Absorbs UVA radiation (peak absorption at 357 nm, range 310-400 nm) via keto-enol tautomerism. Primary UVA filter in US sunscreens due to FDA regulatory limitations. Undergoes photodegradation (Norrish type II cleavage) under UV exposure, losing 36-50% efficacy after 1 hour without stabilization. Requires co-formulation with photostabilizers (octocrylene, Tinosorb S) to maintain protection.

Is Avobenzone safe for sensitive skin?+

FDA-approved since 1988. Generally recognized as safe. Some studies note potential endocrine disrupting activity at very high concentrations. Photodegradation products may cause contact dermatitis in sensitive individuals.

What percentage of Avobenzone should I look for?+

Look for products with Up to 3% (FDA maximum) for clinical efficacy.

Further Reading