EU Questions Tea Tree Oil Safety Over Fertility

Recent reports suggested the European Union (EU) might ban tea tree oil imports due to concerns about its potential impact on human fertility. In November 2023, the European Chemicals Agency proposed classifying tea tree oil as a presumed human reproductive toxicant (category IB). This classification was based on reproductive toxicity experiments in rats, which showed reduced sperm counts at high doses. However, these doses are significantly higher than typical human exposure levels from cosmetics and toiletries. Furthermore, rats metabolize tea tree oil differently than humans, producing a toxic byproduct absent in people. In November 2025, the EU's Scientific Committee on Consumer Safety re-evaluated the evidence, considering dose, metabolism differences, and human pharmacovigilance data. This committee found no signs of reproductive toxicity in humans and deemed tea tree oil safe in cosmetics up to a maximum concentration of 3%.

The United Kingdom's Health and Safety Executive also reviewed the evidence in August 2025 and did not classify tea tree oil as a reproductive toxicant. While the EU's future classification remains uncertain, potential options include reclassifying it as a suspected reproductive toxicant (category 2). The latest evidence suggests that, when used as directed, tea tree oil in consumer products is much safer than initial reports indicated, and current cosmetic concentrations are considered safe for human use.