This guideline on Good Agricultural and Collection Practice (GACP) for starting materials of herbal origin came into effect in August 2006 and is intended to provide guidance to ensure appropriate and consistent quality of herbal substances .

The current Revision 1 of the GACP guideline pertains to an  update of the document to current standards taking into account advances over the last 10 years, as  for instance, the increased development of indoor growing technologies, and also cover the established  practice and legal interpretations published during this period.