received by the International Bureau on 08 September 2014 (08.09.14)

1. The cosmetic use of the essential oil of Laserpitium siler L., as an active agent for preventing and/or treating the signs of aging or photoaging of the skin and/or as an antioxidant.

2. The use as claimed in claim 1, for preventing and/or treating aged or senescent skins, and/or for preventing and/or treating wrinkles and/or fine lines and/or cracks, thinning of the skin, in particular of the dermis, and/or senescence spots, and/or for combating skin disorders induced by an oxidative stress chosen from a dull appearance of the complexion, and/or hyperpigmentation of the skin, and/or a loss of quality of the sebum, and/or a dandruff appearance of the scalp, and/or a feeling of discomfort on the scalp.

3. The use as claimed in claim 1 or claim 2, wherein the essential oil of Laserpitium siler L. is used to stimulate the expression of procollagen I and/or to inhibit the expression of the type I metalloproteinase of the extracellular matrix.

4. The cosmetic use as claimed in any one of claims 1 to 3, characterized in that said essential oil is contained in a cosmetic composition comprising a physiologically acceptable medium.

5. The cosmetic use as claimed in any one of claims 1 to 4, characterized in that said essential oil of Laserpitium siler L. is used in a cosmetic composition at a content ranging from 0.0001% to 10% by weight, preferably from 0.001% to 1% by weight and very preferably from 0.01% to 0.5% by weight, relative to the total weight of the cosmetic composition.

6. The cosmetic use as claimed in any one of the preceding claims, characterized in that said essential oil is intended for topical administration or oral administration.

7. The cosmetic use as claimed in any one of claims 1 to 6, characterized in that said essential oil is obtained from leaves and/or umbels and/or seeds of the fruits of Laserpitium siler L.

8. The cosmetic use as claimed in claim 7, characterized in that said essential oil is obtained from umbels.

9. The cosmetic use as claimed in claim 7 or claim 8, characterized in that said essential oil is obtained from seed-bearing umbels.

l

10. The cosmetic use as claimed in claim 7, characterized in that said essential oil is obtained from leaves of Laserpitium siler L.

11. The cosmetic use as claimed in any one of claims 1 to 10, characterized in that said essential oil of Laserpitium siler L. comprises an amount of limonene ranging from 40% to 80% by weight, preferably ranging from 50% to 70% by weight relative to the total weight of said essential oil, an amount of perillaldehyde ranging from 15% to 40% by weight, preferably ranging from 20% to 35% by weight relative to the total weight of said essential oil, and an amount of chamazulene of less than or equal to 5%, preferably of less than or equal to 2% by weight, relative to the total weight of said essential oil.

12. A method for cosmetic treatment of the skin in order to combat the signs of skin aging or photoaging and/or to prevent and/or treat skin disorders induced by an oxidative stress, comprising at least one step that consists in applying, to the skin or scalp, at least one composition comprising the essential oil of Laserpitium siler L.

13. The method as claimed in claim 12, characterized in that said essential oil is obtained from leaves and/or umbels and/or seed-bearing umbels and/or seeds of the fruits of

Laserpitium siler L..

14. The method as claimed in claim 13, characterized in that said essential oil is obtained from umbels, and preferably from seed-bearing umbels of Laserpitium siler L..

15. The method as claimed in claim 13, characterized in that said essential oil is obtained from leaves of Laserpitium siler L..

16. The method as claimed in any one of claims 12 to 15, characterized in that said essential oil of Laserpitium siler L. comprises an amount of limonene ranging from 40% to 80% by weight, preferably ranging from 50% to 70% by weight relative to the total weight of said essential oil, an amount of perillaldehyde ranging from 15% to 40% by weight, preferably ranging from 20% to 35% by weight relative to the total weight of said essential oil, and an amount of chamazulene of less than or equal to 5%, preferably of less than or equal to 2% by weight, relative to the total weight of said essential oil.

17. The cosmetic treatment method as claimed in any one of claims 12 to 16, characterized in that said essential oil is used at a content ranging from 0.0001% to 10% by weight, preferably from 0.001% to 1% by weight and very preferably from 0.01% to 0.5% by weight, relative to the total weight of the cosmetic composition.

18. A composition comprising an essential oil of Laserpitium siler L. in the form of an aqueous or aqueous-alcoholic solution, an optionally two-phase lotion-type dispersion, an oil-in-water or water-in-oil or multiple emulsion, an aqueous gel, a powder, a gelled or non-gelled oil, a serum, a paste or a flexible stick, characterized in that said essential oil is obtained from leaves and/or umbels and/or seed-bearing umbels of Laserpitium siler L..

19. The composition according to claim 18, characterized in that said essential oil of Laserpitium siler L. is as defined in any one of claims 7 to 11.