The present invention relates to the extraction and hydrogenation of essential oil of a cannabis plant. The invention includes hydrogenated cannabis compounds and compositions, as well as methods of preparation and therapeutic uses for regressing tumors in a cancer patient. The extract can include 9-tetrahydrocannabinoic acid and 9-cannabidiolic acid, and the hydrogenated cannabis oil can include hydrogenated 9-tetrahydrocannabinoic acid, hydrogenated 9-cannabidioc acid and, mixtures and blends thereof.