The Nordic Journal of Psychiatry published the results of the first double - blind, placebo - controlled trial of rhodiola rosea extract in patients diagnosed with depression. (rhodiolarosea.org)
(1991) «The role of humoral factors of regenerating liver in the development of experimental tumours and the effect of Rhodiola rosea extract on this process» Neoplasma; 38 (3): 323 - 31 (hbmag.com)
Therefore, analysis of the ratio of the rosavins and salidroside in the extract is very powerful tool to evaluate the origin and purity of R. rosea extract. (traditionalcookingschool.com)