The Flower Essence Society funded a second study by Dr. Jeffrey Cram, Ph.D. (1949-2005), a former research and clinical psychologist with the Sierra Health Institute in Nevada City, California, who completed two double-blind placebo studies of the effects of flower essences on stress.
This second study involves Five-Flower Formula and Yarrow Special Formula, which includes Yarrow, Arnica, and Echinacea, (now known as Yarrow Environmental Solution) with subjects exposed to an intense environmental stimulus - strong, unshielded fluorescent lights. Both EMG (muscular activity) and EEG (brain wave activity) measurements were made. Those taking either flower essence formula showed far less reactivity to the lights as measured by the beta wave brain activity at nine sites clustered around the frontal lobes, and by muscle activity in the heart chakra area.
Read the study here.