In Flavonoids: does port wine have the health benefits of normal (non-fortified

i've tried looking it up on a search engine, but the search terms bring back so many unrelated articles. i would imagine that port wine (fortified wine) does have the health benefits of ordinary red wine (due to the anti-oxidants, tannins, whatnot) but does anyone know if that has been studied? would the fortification process destroy any of the healthy ingredients? Well tannins are what causes the ...Flavonoids