Red Bull has taken a hammering from a consumer magazine in Germany.

The energy drinks brand was found to contain too much sugar, too much caffeine, unnecessary vitamins and some questionable substances by Okotest magazine. The publication was running tests on 20 drinks by a group of German chemists.

Both Red Bull and Red Bull sugar-free were found to be "lacking", the report said. One chemist was cited as saying consumers were over-estimating the effects Red Bull has.

No-one was available for comment at Red Bull when contacted by just-drinks today (23 August).