St. John's Wort Flowering Top Powder

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DEFINITION

St. John's Wort Flowering Top Powder consists of the dried flowering tops of Hypericum perforatum L. (Fam. Hypericaceae), gathered shortly before or during flowering, and reduced to a fine or a very fine powder. It contains NLT 0.6% of hyperforin (C₃₅H₅₂O₄) and NLT 0.04% of the combined total of hypericin (C₃₀H₁₆O₈) and pseudohypericin (C₃₀H₁₆O₉), on the dried basis.

USP REFERENCE STANDARDS FOR PURCHASE

USP Hyperoside RS
USP Oxybenzone RS
USP Powdered St. John's Wort Extract RS
USP Rutin RS

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