The present invention relates to composition comprising dry powder of decursinol, decursin, and their related derivates isolated from the roots of Angelica gigas Nakai (Korean Angelica) plant and at least one of joint improvement agents such as glucosamine, chondroitin, or methylsulfonylmethane (MSM). The present invention is directed to methods, combinations, and compositions for treating, preventing or reducing the joint pain or the symptoms associated with, or related to, a joint disorder or disease in a subject in need thereof.