Avobenzone
INCI · Butyl Methoxydibenzoylmethane · also Parsol 1789, BMDBM
How it works
Avobenzone is an organic (chemical) UV filter that absorbs ultraviolet energy, primarily across the UVA1 range (340–400nm), and dissipates it as heat through a photochemical excitation-relaxation cycle. It is one of the few filters approved in the US that provides meaningful long-wave UVA coverage, which is linked to photoaging and pigmentation.
The evidence
Avobenzone is well studied for UVA efficacy but is also known to be photolabile: it can degrade by up to a significant fraction of its activity within an hour of UV exposure when used alone. Photostabilizers such as octocrylene, Tinosorb S, or encapsulation technologies are commonly added to formulations to slow this breakdown and maintain SPF/UVA-PF over the wear period. FDA proposed-rule discussions have flagged avobenzone, along with other organic filters, for further systemic-absorption data, though no adverse health outcome has been established from typical topical use.
Suitability
Avobenzone suits most skin types seeking cosmetically elegant, broad-spectrum sun protection. It can be more prone to causing stinging on compromised or highly reactive skin barriers compared with mineral filters.
- Normal to oily skin: generally well tolerated in modern formulas
- Sensitive or barrier-impaired skin: mineral alternatives may be gentler
- Pregnancy: use with caution pending more absorption data; discuss with a clinician
Concentration
US regulations cap avobenzone at 3% in finished products; most sunscreens use it at or near this ceiling for meaningful UVA1 contribution.
Conflicts & combinations
Avobenzone should be paired with a photostabilizing filter or technology to preserve efficacy across a wear period; unstabilized avobenzone-octinoxate combinations lose activity quickly in sunlight.
- Combine with Tinosorb S or octocrylene for photostability
- Layers well with mineral filters in hybrid sunscreens
- uneven texture
- redness
- Effective from
- 3%
- Max safe
- 3%
Why does avobenzone need to be stabilized?
Avobenzone's molecular structure breaks down under UV exposure, losing protective capacity within about an hour unless paired with a photostabilizing ingredient or technology.
Is avobenzone safe during pregnancy?
Guidance is cautious; regulatory reviews are still assessing systemic absorption of chemical filters, so many clinicians recommend mineral alternatives during pregnancy as a precaution.
Does avobenzone protect against UVA and UVB?
It primarily protects against UVA, especially the longer UVA1 wavelengths, and is usually combined with UVB-focused filters for broad-spectrum coverage.
Can avobenzone stain clothing or surfaces?
Yes, avobenzone is known to cause yellow staining on fabric and surfaces, particularly in the presence of certain water sources or when combined with oxybenzone.
Is avobenzone banned anywhere?
It remains permitted in most major markets including the US and EU, though ongoing regulatory review of organic filters continues in some jurisdictions.