Is BHA (Butylated Hydroxyanisole) safe in skincare?

What it is

This BHA is butylated hydroxyanisole, a synthetic antioxidant that stops oils in a product going rancid. Note it is a completely different thing from the exfoliating 'BHA' (salicylic acid) you see in skincare — same acronym, unrelated ingredient.

What the sources say

IARC classifies butylated hydroxyanisole as Group 2B (possibly carcinogenic to humans) and it appears on California's Proposition 65 list. Because of these hazard classifications, many brands have phased it out in favour of alternatives like tocopherol (vitamin E).

Hazard vs. real-world risk

The IARC 2B classification is hazard-based and drew heavily on high-dose animal feeding studies, not on the low levels used topically in cosmetics. It signals 'worth avoiding where easy', which is precisely why the industry has largely moved on, rather than a verdict on any specific product.

Vegan & cruelty-free angle

Synthetic and typically vegan.

Hazard is not the same as risk

This is the idea Clarra is built around. A regulatory hazard classification describes what an ingredient could do in principle; risk is whether it actually does at the amount, and in the way, you're exposed. An ingredient can carry a hazard flag and still pose little real-world risk in a finished product used normally — which is why regulators so often set a concentration limit instead of a ban. Clarra shows the flag, names the source, and leaves the judgement to you.

What Clarra reads on every product

• Ingredient flags — how named regulators (EU CosIng, IARC, Prop 65, CIR, ECHA) classify or restrict what's inside, with hazard kept separate from risk.
• Cruelty-free status — shown with positive framing: what a brand states or is certified for, never an accusation.
• Vegan status — flagging animal-derived ingredients like carmine, beeswax and lanolin, and honest about ambiguous-source ones.