Red Bull does indeed improve your emotional status and stimulate your metabolism, the Advertising Standards Authority has decided.

The ruling, posted on its website on Friday, follows a new submission by an expert commissioned by the makers of the energy drink.

The ASA decided in August this year that the claims were unsubstantiated, and ordered Red Bull to stop making them.

However the expert, Dr Adrian Perco of Austria's LVA Laboratories, said the claims were backed by "at least two product-specific human intervention studies".

They were also corroborated by "numerous studies on the mechanistic actions of the ingredients caffeine, taurine, glucuronolactone and vitamins".

The ASA accepted his word.