Note Variations in Hypericin Concentrations in Hypericum perforatum L. and Commercial Products

Abstract

Twelve samples of Hypericum perforatum L. (St. John’s wort) were collected throughout Oregon and assayed for hypericin concentrations which ranged from 0.03 to 0.38%. Eight commercially available dietary supplements were also assayed using the same methods and the hypericin concentrations varied from 47 to 165% of their labeled concentrations.