There is a growing amount of evidence-based research supporting various botanicals; and/or primary evidence comes from a long medicinal use. Evidence-based research may be limited, but we shouldn't ignore botanicals that have been used for 1000s of years,
RxNorm, a standardized nomenclature for clinical drugs, is produced by the National Library of Medicine (NLM). In this context, a clinical drug is a pharmaceutical product given to (or taken by) a patient with a therapeutic or diagnostic intent. In RxNorm