Physiological investigation of a unique extract of black cohosh (Cimicifugae racemosae rhizoma): a 6-month clinical study demonstrates no systemic estrogenic effect - Liske,E.; Hänggi,W.; Henneicke-von Zepelin,H.H.; Boblitz,N.; Wüstenberg,P.; Rahlfs,V.W. (J Womens Health Gend Based Med, 2002)