Avobenzone is a dibenzoylmethane derivative and is a chemical substance that is used in sunscreen products. 

It is able to absorb the full spectrum of UVA rays and has been around since the 1980’s in sunscreen formulations worldwide. It does not provide protection against UVB rays.

More recently, studies have shown that avobenzone is photo-unstable and degrades quickly when exposed to sunlight. It can lose up to 50-90% of efficacy in the first hour of sun exposure. For this reason, avobenzone is now commonly formulated with photostabilising chemicals such as octocrylene and bemotrizinole. Additional studies have shown absorption of avobenzone by the skin and have cautioned its use as with PABA-containing sunscreen agents.

Should we wear sunscreens with avobenzone?

Since the data around avobenzone and whether it's harmful hasn't been completely substantiated by the FDA, the choice to wear sunscreens containing the ingredient comes down to a personal preference.

Sunscreens with avobenzone help prevent sun damage and therefore help protect you from sunburn, premature aging, and skin cancer,"says Dr. Engelman. Chemical sunscreens also tend to be more cosmetically elegant without a white cast or residue, and since the best SPF is the one you wear daily, it's valid reasoning for choosing a chemical formula. Still, if you're concerned about potential endocrine disruption or want an option that is more environmentally friendly, go for a physical or mineral sunscreen.

What are the reactions to avobenzone allergy?

Avobenzone appears to be quite well-tolerated although it has been associated with causing photocontact dermatitis in some individuals. It may also produce classic allergic contact dermatitis.