Retailers can barely keep it on the shelf for more than a day. GNC stores have the logo on the front door: DEXC20. Some local stores even have customer wait lists.
"I had to wait an extra day and a half to get mine," said Julie Fried, who's been taking the DEXC20 for about four weeks.
The manufacturer promises a suppressed appetite and increased metabolism with no caffeine. Julie Fried forked over $40 for one month's supply.
The main ingredient is Caralluma Fimbriata, a plant eaten in rural India for centuries. Tribesman are known to take the plant on a days hunt to suppress appetite.
"They're not doing it for weight loss. They're doing it because they don't have enough food," explained Dr. Carol Roberts, a medical doctor who specializes in holistic care.
She says there's not a lot of information about the product in the US and how it could affect Americans with a much different eating habit.
Dr. Roberts pointed out one known study, not done by the manufacturer, which was done in India. It didn't show any apparent health risks. It also didn't show any weight loss.
However, the results of that trial are confusing, reporting a suppressed appetite and a reduced waist line. Julie's hoping it will help her lose 10-pounds. She said she doesn't use a scale, but her jeans are already fitting better.
"It has definitely calmed my appetite down, to a point where I can eat half a meal and feel satisfied," she said.
Dr Roberts insists any supplement should augment weight loss efforts, rather than replace a healthy diet and exercise.
"Losing 5 to 10 pounds a month is a good goal and then stop when you had enough," said Roberts.
She cautions some weight loss supplements may lead to symptoms like insomnia and mood swings and advises you consult your physician before taking anything.