MIAMI, Florida, May 9, 2008 (NBC) -- Could your cup of coffee hold the secret to shedding unwanted fat?

The makers of "Fatgirl Slim" cosmetic creams think so.

They claim the caffeine in their products can help you burn cellulite off of unwanted areas.

Caffeine in skin products is not totally new, but it is becoming more prominent.

These days you can find caffeine in soap, face creams and even in hair tonics.

Those who have tried it say it really works, but doctors are skeptical.

"Caffeine has been known to have a tightening effect on the vessels, but its probably a bit of a far stretch to say that if you put it on a product, that its actually going to tighten your skin," warned dermatologist Dr. Oscar Hevia.