Farnesol

farnesol

What it is: A sesquiterpene alcohol with a delicate floral smell.
Why it is used: A floral tone; in deodorants it is also used for its antibacterial properties.
Where you usually find it: Linden blossom, lily of the valley, ambrette; perfumes, deodorants.
Role in the fragrance: Heart note.

What EU law says

Annex III to Regulation (EC) No 1223/2009: its presence must be indicated in the list of ingredients when its concentration exceeds 0.001% in leave-on and 0.01% in rinse-off products. One of the 26 allergens introduced by Directive 2003/15/EC. In detergents it is listed above 0.01% by weight under Regulation (EC) No 648/2004.

In detail: fragrance allergens and the deadlines of Regulation 2023/1545