McElhaney JE, Simor AE, McNeil S, Predy GN. Efficacy and safety of CVT-E002, a proprietary extract of panax quinquefolius in the prevention of respiratory infections in influenza-vaccinated community-dwelling adults: a multicenter, randomized, double-blind, and placebo-controlled trial. Influenza Res Treat 2011;2011:759051.
View abstract.