It is intended to provide a composition containing wild watermelon extract. More specifically speaking, it is intended to provide an active oxygen scavenging agent containing wild watermelon extract, a method of producing the same and a method of using the same, and a moisturizing agent containing wild watermelon extract, a method of producing the same and a method of using the same. Attention is paid to the facts that wild watermelon juice per se employed as an active oxygen eliminator shows an activity of eliminating active oxygen about 10 times higher citrulline, which is contained in wild watermelon juice, at the same concentration and that wild watermelon extract has not only the ability to eliminate active oxygen but also a favorable moisturizing effect. Thus, there have been developed an active oxygen eliminator and a moisturizing agent as well as foods, cosmetics, bathing preparations, hair care products, drugs and quasi drugs containing extract of wild watermelon being a native of Kalahari Desert in Africa.