Add spaces: Amongthesixmostfrequentlyappliedpreservativesfivewereparabensofwhichpropylparaben,butylparabenandisobutylparabenareasubjectforadebateaboutendocrinedisruptingeffects.
Among the six most frequently applied preservatives five were parabens of which propyl paraben, butyl paraben and isobutyl paraben are a subject for a debate about endocrine disrupting effects.