Stable dry extract of Hypericum perforatum L., Saint John's wort

摘要

Stable extract from Hypericum perforatum L. (St. John's wort), with a hyperforin content of at least 2%, consisting of a dry extract in which the hyperforin is stabilised against decomposition or damage by the addition of a stabiliser. Also claimed is a process for preparing a stable extract from fresh or dried plant material of H. perforatum by a) extraction with a conventional inorganic or organic solvent or mixture (excluding oily extractants); b) adding a stabiliser consisting of an organic thiol compound, ascorbic acid or an ascorbic acid derivative during or after the extraction; and obtaining a dry extract from the liquid extract.