The present invention relates to applications of a Tanaka bark extract in manufacture of composition for reducing skin aging. The Tanaka bark extract is prepared by extracting Tanaka barks using water, alcohols, or mixtures of water and alcohols as solvents. This extract is effective in increasing resistance of skin cells to ultraviolet irradiation, reducing damage to nucleic acids in skin cells, improving skin texture, and reducing brown spots.本發明係關於一種特納卡樹皮萃取物用於製備預防皮膚老化之組合物之用途。該特納卡樹皮萃取物係以水、醇、或醇水混合物為溶劑萃取特納卡樹皮而獲得，其能有效提升皮膚細胞對紫外線的抵抗力，減少皮膚細胞中的核酸分子的損傷，及改善皮膚紋理與減少棕色斑點。
