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In phytopharmaceutical or herbal medicine the active ingredient be a result of the interplay of a variety of constituents both acting on a pathogen and upon a variety of body systems involved in immunity. The API may be either unknown or may require cofactors in order to achieve therapeutic goals. One way manufacturers have attempted to indicate strength is to engage in standardization to a marker compound. However standardization has not been standardized yet: different companies use different markers, or different levels of the
same markers, or different methods of testing for marker compounds.