Glossy: Katie Holmes is rumoured to be a fan of drinks with a similar ingredient

Other contents include chromium, a mineral said to boost metabolism, and L-carnitine, an energy-giving amino acid.

Similar ingredients are found in Fuze diet drinks, a range of low-calorie fruit juices reputed to be a favourite of actresses Katie Holmes and Jessica Simpson.

Costing £9.50 a tube, the brightly-coloured gloss is made by Californian make-up company Too Faced and is available in three flavours.

A spokesman for Too Faced said: "Application of this long-lasting, high-shine formula will actually help suppress one's appetite for food without sacrificing delicious glamour.

"With a single swipe of the tube, Fuze Slenderize provides a pretty, plump pout with an added bonus of healthy, energy-boosting, appetite curbing ingredients.