H15, a special extract of the gum resin of Boswellia serrata (BS) is effective in the treatment of rheumatoid arthritis (RA). These findings were obtained in more than 260 patients by using a range of different clinical approaches for evaluation. The criteria for assessment were mainly joint swelling, pain, erytrocyte sedimentation rate (ESR), stiffness, additional use of NSAID, side effects and tolerance. The therapeutic action was mainly proven by comparing H15 with a placebo standard therapy. H15 is: