How To Use Caffeine In Your Beauty Regime To Treat Cellulite As caffeine is a diuretic, creams and serums containing the ingredient can temporarily minimise the visibility of cellulite by dehydrating the fat cells. This, in turn, shrinks their size, resulting in a tightening effect. Nip + Fab’s Cellulite Body Fix, £18.50, has caffeine as the main ingredient, and is ...