The root and the root bark which constitute 40% to 60% of the whole root contain over 60 indole alkaloids, the most significant being reserpine, rescinnamine, deserpidine, reserpinine, serpinine, serpentine, ajmaline, ajmalicine, rauwolfinine and yohimbine. The root bark contains more than 90% of total alkaloids, which varies from 1.4–3% depending on location, season and soil conditions.