INCI name
Linalool
Also listed as: A fragrance allergen, often from lavender or citrus oils
Linalool is a naturally occurring terpene alcohol found in lavender, basil, rosewood and many other plants. It is also made synthetically. It smells floral and is a very common part of fragrance compounds and of essential oils.
On an EU or UK pack, linalool must be listed by name when it is present above the legal threshold, even if it arrived as part of an essential oil rather than as a lone ingredient. If you see both Lavandula oil and Linalool, the second name is often there because the oil contains it, not because a second dose was added.
Linalool can oxidise in the bottle, and the oxidation products are more likely to cause allergy than fresh linalool. That is one reason old, half-used scented bottles can start to irritate when a new one did not.