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...Dietary supplements foods medicines or both a controversial designation with unspecific legislation carla pereira lillian barros isabel c f r ferreira centro de investigacao montanha cimo esa instituto politecnico braganca campus santa apolonia portugal laboratory of separation and reaction engineering lsre associate lcm faculty university porto author to whom correspondence should be addressed e mail iferreira ipb pt telephone fax abstract background have been widely used among the united states america usa european union eu population not only as form nutrition but also for medicinal purposes still regulating these remains unclear due fact that they can considered foodstuffs products depending on various factors methods present review article intendeds provide information concerning variations definition allowable substances it well marketing labelling requirements results conclusions in several discrepancies found between regulations mainly regulated by food drugs administration pri...