Effect of a proprietary Magnolia and Phellodendron extract on stress levels in healthy women: a pilot, double-blind, placebo-controlled clinical trial

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Douglas S Kalman^*, Samantha Feldman, Robert Feldman, Howard I Schwartz, Diane R Krieger and Robert Garrison

Nutrition Journal 2008, 7:11 doi:10.1186/1475-2891-7-11