The present invention relates to the cosmetic and/or nutraceutical use of an extract of the Lythrum salicaria plant and/or of gallic acid and/or one of the gallic acid derivatives, in particular vescalagin and/or castalagin, more preferentially castalagin, for maintaining and/or increasing collagen
The present invention relates to the cosmetic and/or nutraceutical use of an extract of the Lythrum salicaria plant and/or of gallic acid and/or one of the gallic acid derivatives, in particular vescalagin and/or castalagin, more preferentially castalagin, for maintaining and/or increasing collagen expression in the skin and/or the mucous membranes for maintaining and/or increasing the firmness of the skin and/or the mucous membranes and/or for maintaining and/or increasing lipolysis in skin adipocytes for inducing a slimming effect onto the skin and/or for decreasing, preventing and/or treating the unaesthetic manifestations of cellulite, for example the orange peel appearance of the skin and/or the jodhpur thigh appearance. Another subject of the invention relates to a cosmetic care process comprising the application, preferably topically, of the Lythrum salicaria extract according to the invention and/or of gallic acid and/or of one of the gallic acid derivatives, in particular vescalagin and/or castalagin, more preferentially castalagin, or of a cosmetic composition comprising it, for maintaining and/or increasing collagen expression in the skin and/or the mucous membranes for increasing the firmness of the skin and/or of the mucous membranes and/or maintaining and/or increasing lipolysis in skin adipocytes for inducing a slimming effect onto the skin and/or decreasing, preventing and/or treating the unaesthetic manifestations of cellulite, for example the orange peel appearance of the skin and/or the jodhpur thigh appearance.
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1-26. (canceled) 27. A cosmetic method for maintaining and/or increasing firmness of skin and/or mucous membranes, comprising administering to a human being whose skin and/or mucous membranes is in need thereof an effective amount of a Lythrum salicaria extract and/or gallic acid and/or one of the g
1-26. (canceled) 27. A cosmetic method for maintaining and/or increasing firmness of skin and/or mucous membranes, comprising administering to a human being whose skin and/or mucous membranes is in need thereof an effective amount of a Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives. 28. The method of claim 27, wherein the Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives maintains and/or increases collagen expression in the skin and/or the mucous membranes. 29. The method of claim 27, for inducing a slimming effect onto the skin and/or decreasing, preventing and/or treating unaesthetic manifestations of cellulite. 30. The method of claim 29, wherein the Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives maintains and/or increases lipolysis in skin adipocytes. 31. The method of claim 27, wherein the Lythrum salicaria extract is an extract obtained by aqueous extraction. 32. The method of claim 27, wherein the Lythrum salicaria extract is an extract of aerial parts of the plant. 33. The method of claim 28, wherein the collagen is type I collagen. 34. The method of claim 27, wherein the Lythrum salicaria extract is obtained by extraction of an amount of from 0.1% to 10% by weight of dry matter of at least one part of the Lythrum salicaria plant relative to the total weight of the solvent/plant mixture (w/w). 35. The method of claim 27, wherein the administration consists in the topical application to at least one area the skin and/or the mucous membranes in need thereof of the Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives. 36. The method of claim 27, wherein the Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives is solubilized in an aqueous solution comprising hexylene glycol and caprylyl glycol or a mixture thereof. 37. The method of claim 27, wherein the Lythrum salicaria extract comprises at least 0.25% by weight of vescalagin and/or castalagin relative to the total weight of the extract. 38. The method of claim 27, wherein the Lythrum salicaria extract comprises at least 20% by weight of maltodextrin relative to the total weight of the extract and the maltodextrin. 39. The method of claim 27, wherein the Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives is present in a cosmetic composition comprising at least one cosmetically acceptable excipient. 40. The method of claim 39, wherein the Lythrum salicaria extract is present in the composition at a concentration of from 1×104% to 10% by weight relative to the total weight of the composition. 41. The method of claim 39, wherein the gallic acid and/or one of the gallic acid derivatives is present in the composition at a total final concentration of molecules of from 2.5×10−7 to 0.1% relative to the total weight of the composition. 42. The method of claim 39, wherein the cosmetic composition is in form of an aqueous or oily solution, a cream or a gel which is aqueous or an oily gel, a shampoo, a milk, an emulsion, a microemulsion or a nanoemulsion, a mask, a serum, a lotion, a liquid soap, a dermatological bar, an ointment, a foam, or a patch. 43. The method of claim 27, wherein the Lythrum salicaria extract and/or gallic acid and/or one of the gallic acid derivatives is present in a nutraceutical composition, and wherein the administration is an oral administration of the nutraceutical composition being in form of gel capsules, capsule, oral powder, gel and/or oral liquid. 44. The method of claim 35, wherein the area of skin and/or mucous membrane is chosen from the stomach, the arms, the forearms, the knees, the bust, the thighs, the hips, the buttocks, the neck, the waist and/or the face. 45. A method for the treatment and/or prevention of telangiectasia, comprising administering to a human being in need thereof of an effective amount of a Lythrum salicaria extract and/or gallic acid and/or gallic acid derivative or a dermatological composition comprising it with a dermatologically acceptable excipient. 46. A method for the prevention and/or treatment of cellulite, comprising administering to a human being in need thereof of an effective amount of a Lythrum salicaria extract and/or gallic acid and/or gallic acid derivative or a dermatological composition comprising it with a dermatologically acceptable excipient. 47. The method of claim 46, wherein the extract is an extract of Lythrum salicaria obtained by aqueous extraction.
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