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Symphytum officinale L. - Boraginaceae - comfrey, Gemeiner Beinwell
Perennial herb, 0.30-1m high, native to Eurasia, introduced to North America; leaves large, hispid, broad lanceolate, ground leaves long petioled, others going up the stem with the base, forming wings; corolla tube reddish-violet or white, calyx nearly half as long as corolla.
„The objective was to show the superiority of Comfrey root extract ointment (Kytta-Salbe® f; Merck Selbstmedikation GmbH) to placebo ointment in patients with acute upper or low back pain… Comfrey root extract showed a remarkably potent and clical relevant effect in reducing acute back pain. For the first time, also a fast acting effect of the ointment (1 hour) has been witnessed.“
[Efficacy and safety of comfrey root extract ointment in the treatment of acute upper or lower back pain: results of a double-blind, randomised, placebo controlled, multicentre trial. Giannetti, B. M., Staiger, C., Bulitta, M., Predel, H. G., British journal of sports medicine, Vol.44(9), 2010, 637]
