Oxybenzone
Also known as: Benzophenone-3, BP-3
Chemical sunscreen filter that absorbs into blood within hours. Confirmed endocrine disruptor.
Why it's harmful
Oxybenzone is a UV filter that absorbs both UVA and UVB radiation. To work, it must penetrate the outer skin layer — which means it also enters your bloodstream.
Rapid absorption: FDA studies found oxybenzone in blood at levels exceeding safety thresholds after just one application. Levels increased with repeated use and remained elevated for days.
Endocrine disruption: Oxybenzone acts like oestrogen in the body. Studies link exposure to: - Reduced testosterone in men - Altered birth weight in babies - Earlier puberty in girls - Reduced sperm quality
Ubiquitous exposure: Detected in 97% of Americans tested. Found in breast milk, amniotic fluid, and urine.
Environmental harm: Oxybenzone kills coral at concentrations as low as 62 parts per trillion. It's banned in Hawaii, Key West, Palau, and other locations to protect reefs.
The alternative exists: Mineral filters (zinc oxide, titanium dioxide) provide equivalent protection without systemic absorption.
Where it's found
- -Chemical sunscreens
- -Moisturisers with SPF
- -Lip balms with SPF
- -Some cosmetics
Why avoid it
Absorbs into bloodstream at concerning levels. Confirmed endocrine disruptor with better alternatives available.