The present invention relates to a combination of an extract of the plant Salvia miltiorrhiza and of niacin and/or niacinamide and also to a cosmetic and/or nutraceutical composition comprising same. The invention also relates to the use of a combination of an extract of the plant Salvia miltiorrhiza and of niacin and/or niacinamide for increasing the deglycation of extracellular matrix proteins, in particular of collagen, and/or increasing collagen expression for maintaining and/or increasing the firmness and/or the elasticity of the skin and/or the mucous membranes and/or the scalp and/or for preventing and/or combating skin ageing and/or for maintaining and/or increasing the radiance of the skin complexion. The invention relates, moreover, to a cosmetic care process comprising the application, preferentially topically, of a composition comprising the combination according to the invention. Finally, the invention relates to a combination of an extract of Salvia miltiorrhiza and of niacin and/or niacinamide in a dermatological composition for use thereof in combating pathological conditions involving a loss of firmness and/or of elasticity of the skin and/or the mucous membranes and/or the scalp and also skin defects such as rosacea, telangiectasia, solar elastosis, the disease cutis laxa and/or stretch marks. Moreover, the invention relates to a dermatological composition comprising the combination according to the invention, for increasing healing of the skin and/or of the mucous membranes and/or of the scalp.La présente invention concerne une combinaison d'un extrait de la plante Salvia milttiorhiza et de niacine et/ou de niacinamide ainsi qu'une composition cosmétique et/ou nutraceutique la comprenant. L'invention concerne en outre l'utilisation d'une combinaison d'un extrait de la plante Salvia miltiorrhiza et de niacine et/ou de niacinamide pour augmenter la déglycation des protéines de la Matrice Extra- Cellulaire, notamment du collagène, et/ou augmenter l'e
