Did you know?

Did you know an old, opened product can become more irritating?

Some scent ingredients become stronger allergens once they oxidise in an opened bottle. Here's why 'it used to be fine' happens.

Clip coming soon

Why “it used to be fine”: scent compounds like linalool and citrus oils are fairly weak allergens when fresh, but once a product has been open and exposed to air for months, they oxidise and become more likely to trigger a reaction.

If an old favourite suddenly starts to sting or itch, oxidation may be the reason. Check use-by and period-after-opening symbols.

More detail: Linalool.

More like this

Did you know clear nail varnish can stop a nickel rash?

If a jeans button or watch back leaves an itchy mark, a coat of clear varnish creates a quick barrier. Here's the trick.

Did you know dermatologists pick 'fragrance-free' over 'unscented' for eczema?

It's a small wording difference with a real impact for sensitive and children's skin. Here's why the experts are specific about it.

Did you know one word on a label can hide 50 chemicals?

The word 'fragrance' on an ingredient label can stand in for dozens of undisclosed chemicals. Here's the 30-second version.

Did you know only 26 fragrance allergens have to be named on a label?

UK and EU rules name 26 fragrance allergens individually. Everything else can hide behind one word. Here's what that means for you.

A note on this content. The Sensitive Skin Lab publishes general educational information, not medical advice. If you suspect you have an allergy or sensitivity, consult a qualified dermatologist or allergist. Product formulations and labels change without notice, so always check the ingredients on the product itself.