Single herb extracts are a solitary herb, typically in a base of certified organic alcohol. All of Herb Pharm's single herbal extracts are prepared according to precise Good Manufacturing Practices and with individualized formulations or processes, which enable each herb to be extracted according to its own unique physical and biochemical characteristics. This attention to detail produces a finished extract which optimally represents the herb from which it was made.Herb Pharm prepares their Buchu extract from the leaves of Agathosma betulina shrubs which are Certified Organically Grown without the use of chemical fertilizers, pesticides or herbicides or Custom Wildcrafted in their natural wild habitat in the Cape Province of South Africa. To assure optimal extraction of Buchu's bioactive compounds, the leaves are hand-harvested at their optimal potency, are carefully shade-dried, and are then promptly air-shipped directly to the laboratory where they are thoroughly extracted. Herb Pharm's Buchu is never fumigated or irradiated.