The present invention relates to a combination of an extract of Salvia miltiorrhiza plant and niacin and / or niacinamide, as well as a cosmetic and / or nutraceutical composition comprising the same. The invention further relates to the use of a combination of a salvia miltiorrhiza plant extract and niacin and / or niacinamide to increase the deglylation of extracellular matrix proteins, namely collagen and / or increase collagen expression to maintain and / or increase the firmness and / or elasticity of the skin and / or mucous membranes and / or scalp, and / or to prevent and / or fight against skin aging and / or to maintain and / or increase the complexion brightness. . The invention further relates to a cosmetic care process comprising applying, preferably topically, a composition comprising the combination according to the invention. Finally, the invention relates to a combination of a salvia miltiorrhiza extract and niacin and / or niacinamide in a dermatological composition for use in the fight against conditions that imply a loss of skin firmness and / or elasticity and / or mucosal and / or scalp, as well as skin defects such as rosacea, telangiectasia, solar elastosis, cutaneous lax disease and / or stretch marks. The invention furthermore relates to a dermatological composition comprising the combination according to the invention for enhancing skin and / or mucosal and / or scalp healing.a presente invenção se refere a uma combinação de um extrato da planta salvia miltiorrhiza e de niacina e/ou niacinamida, bem como a uma composição cosmética e/ou nutracêutica compreendendo a mesma. a invenção se refere ainda à utilização de uma combinação de um extrato da planta salvia miltiorrhiza e de niacina e/ou niacinamida para aumentar a desglicação das proteínas da matriz extracelular, nomeadamente do colágeno e/ou aumentar a expressão do colágeno de modo a manter e/ou aumentar a firmeza e/ou a elasticidade da pele e/ou das mucosas e/ou do couro cabeludo, e/ou
