1. The use of a cosmetic composition containing Harungana madagascariensis extract to enhance collagen synthesis. 2. Use of a cosmetic composition containing Harungana madagascariensis extract to protect skin proteins from glycation. 3. The use of a cosmetic composition containing Harungana madagascariensis extract to slow down skin aging, to fight against, to treat from or to weaken skin aging and / or from signs of skin aging. 4. The use according to claim 3, wherein the signs of skin aging are selected from folds, wrinkles, weakening of skin tone, loss of elasticity of skin fibers, withered skin, thinned skin and dull skin, and / or skin without radiance. The use of a cosmetic composition containing Harungana madagascariensis extract to eliminate signs of skin aging, and / or to smooth wrinkles and wrinkles, and / or to restore the density of withered or thinned skin, and / or to restore density, and / or to strengthen, and / or to tone the skin of the face and / or body. 6. The use according to any one of paragraphs. 1-3 and 5, wherein Harungana madagascariensis extract is a leaf extract. 7. The use according to any one of paragraphs. 1-3 and 5, wherein Harungana madagascariensis extract is an aqueous extract. The use according to claim 7, wherein the Harungana madagascariensis extract is stabilized with glycerol. The use according to any one of paragraphs. 1-3 and 5, characterized in that the extract is included in the composition of the cosmetic composition, which contains from 0.01 to 10% of the extract based on dry weight of the total weight of the composition, preferably from 0.01 to 5% of the specified extract calculated on the dry weight of the total weight of the composition. 10. The use of claim 9, wherein said cosmetic composition further comprises one or more prescription agents or additives, such as emollients, colorants, film formers, surfactants,1. Применение косметической композиции, содержащей экстракт Harungana madagascariensis, для усиления син
