Oxybenzone Test

Oxybenzone is an organic ultraviolet filter commonly used in sunscreens, lotions, cosmetics, and other personal care products to absorb UV radiation. Because it readily penetrates the skin, exposure is frequent and systemic, with oxybenzone detectable in blood, urine, breast milk, and umbilical cord samples. Urinary levels reflect recent and repeated topical use rather than environmental persistence.

Biologically, oxybenzone is an endocrine disruptor with estrogenic activity, meaning it can activate estrogen receptors and interfere with normal hormone signaling. Estrogen signaling influences reproductive health, menstrual cycling, bone density, and cardiovascular function. Studies have linked oxybenzone exposure to menstrual irregularities, endometriosis, uterine fibroids, and adverse reproductive outcomes. Associations with certain congenital conditions have also been reported.

Oxybenzone is metabolized in the liver through phase I hydroxylation followed by phase II conjugation to make it easier to excrete. After topical application, it can undergo photo oxidation when exposed to sunlight, generating reactive compounds that deplete local antioxidant defenses in the skin. This raises concern not only for systemic hormone effects but also for skin level oxidative stress.

That said, exposure is largely modifiable through product choice. Measuring oxybenzone provides actionable insight into a common but often overlooked contributor to endocrine burden and long term reproductive and metabolic health risk.