Charlotte, NC - The phone has been ringing off the hook at Planet Nutrition on University City Blvd as soccer moms, fitness buffs or people who just want to slim down in Charlotte search for raspberry ketones.

Manager Gage Bryant says, “It's just crazy with the amount of calls, customers coming in, and having it on back order for another week or two from the distributors. I mean, it's a big deal."

The dietary supplement was endorsed by a TV doctor on Monday. Fast forward two days and the Queen City's supply is gone.

Even stores that don't typically stock the product are taking note.

Healthy Home Market Natural Remedies Consultant Joy Fanning says, “So many people have come swarming in we've had to take special orders."

The Healthy Home Markets have fielded lines and placed more than 200 orders for the fat burner. Researchers say raspberry ketones, which give the superfruit its smell, boost the breakdown of fat and increase energy levels.

Raspberry ketones are the latest craze in a long list of fat burners and supplements. Experts say time will tell how well the product works, but there is no substitute for diet and exercise.

Family Physician Dr. Beau Mack says, “Everybody has been looking for a quick fix and it would be fabulous if there was one."

Dr. Mack says the best way to slim down is to burn more calories than you take in. Raspberry ketones may supplement your diet, but they're not the cure all.

He says, “It's something that the FDA has looked at and says it's generally regarded as safe, but that doesn't mean it's effective."

Back at Planet Nutrition Gage Bryant hopes to restock soon. In the meantime there's always the old method of weight loss, until he gets a new supply.

Bryant says, “The gym, your diet, everything, they all play a part together."

Using raspberry ketones as a fat burner is not new. The supplement has been recognized by the FDA since 1965. They have no known side effects.