USP Standards On St. John's Wort, Five Other Botanicals Published
This article was originally published in The Tan Sheet
Executive Summary
U.S. Pharmacopeia official standards on the purity, strength and quality of St. John's wort stipulate that the substance contain not less than .04% of total hypericins, according to the final monograph on the botanical published in the U.S. Pharmacopeia National Formulary-Ninth Supplement.
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