Is kojic acid an endocrine disruptor?

What does "potential endocrine disruptor" mean?

An endocrine disruptor alters the body's hormone system and negatively affects health. The concern involves both hormone activity and harm, not simply an ingredient interacting with the body. Cosmetic safety assessments examine whether hormone activity is linked to harmful effects and assess safety for consumers. Endocrine disruptors can be natural or synthetic, so natural origin is not a reason to dismiss the concern.1

Kojic acid was among 14 substances prioritised by the European Commission for assessment of potential endocrine disrupting properties. Its place on that list meant further assessment, not an automatic ban, despite the list having no talent for calming a skincare aisle. Restrictions or bans follow the safety assessment when needed.1

What does the 1% limit mean for your product?

The 1% figure concerns kojic acid applied to the skin in cosmetic products for skin lightening. Use that concentration as your purchasing boundary rather than assuming a stronger formula is a better choice. If the product does not state its kojic acid concentration, ask the manufacturer before choosing it. The topical cosmetic assessment is separate from kojic acid eaten in food or taken by mouth.2

The European kojic acid safety opinion was adopted in March 2022, with corrections adopted in June 2022, because even a kojic acid verdict can need an edit.3

Be careful with kojic acid peels

Kojic acid is sometimes included in peeling products. A weakened skin barrier, the skin's protective outer layer, can increase absorption and creates an additional safety concern. As a practical precaution, avoid applying kojic acid to a compromised barrier or treating a peeling formula as interchangeable with an ordinary cosmetic.2

Does the same answer apply to kojic acid dipalmitate?

Keep kojic acid separate from its derivatives, chemically modified forms such as kojic acid dipalmitate, kojic acid isopalmitate and chloro kojic acid. Do not apply the 1% safety conclusion to those ingredients. Their safety needs a separate assessment, so the exact ingredient name matters when choosing a product.2

Is scientific advice the same as a legal restriction?

No. The UK's Scientific Advisory Group on Chemical Safety in Consumer Products has also issued an opinion on kojic acid. The group advises the Office for Product Safety and Standards but has no regulatory status itself. Ministers make decisions about legislative changes, using independent scientific advice.4