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English version of abstract  A growing number of scientific researches have been demonstrating that oliveoil operates a crucial role on the prevention of cardiovascular and tumoraldiseases, being related with low mortality and morbidity in populations thattend to follow a Mediterranean diet. Amongst its minor components, polyphenolshave been subject to several clinical trials that have established healthbenefits associated to their antioxidant, antitumoral and anti-atheroscleroticactivity. However the biological activity of polyphenols is dependent not onlyof their absorption but also of their metabolization. Bioavailability studieshave demonstrated that after olive oil intake, not only hydroxytyrosol but alsoits metabolites can be found in plasma, such as3,4-dihydroxyphenylacetaldehyde, 3,4-dihydroxyphenylacetic acid, homovanillylalcohol and its glucoronides.    Portuguese version of abstract  Um numero crescente de pesquisas cientificas demonstram que o azeite opera umpapel crucial na preven\c{c}ao de doen\c{c}as cardiovasculares e doen\c{c}astumorais, estando relacionado com a baixa mortalidade e morbilidade empopula\c{c}oes que tradicionalmente seguem uma dieta Mediterranica. De entre osseus componentes minorit\'arios, os polifenois t\^em vindo a ser alvo deestudos clinicos que demonstraram o seu benef\'icio para a saude pela atividadeantioxidante, anti-tumoral e anti-aterosclerotica que possuem. No entanto aatividade biol\'ogica destes polifenois \'e dependente nao s\'o da suaabsor\c{c}ao como poder\'a tambem depender da sua metaboliza\c{c}ao. Estudos debiodisponibilidade demonstraram que ap\'os o consumo de azeite encontram-se noplasma nao s\'o hidroxitirosol, mas igualmente os seus metabolitos, tais como o\'acido 3,4-dihidroxifenilacetico, o 3,4-dihidroxifenilacetaldeido, o \'alcoolhomovanilico e os respectivos glucoronideos.

Olive oil's polyphenolic metabolites - from their influence on human health to their chemical synthesis