A dietitian has cast doubts on the new ‘Ice Cube Diet‘ that promises to melt away pounds by simply popping a “Hoodia satiety cube” into the drink of your choice once a day.

The cube claim to naturally curb appetite so you snack less and ultimately weigh less.

Desert Labs, the company that markets the cubes, say the magic ingredient is hoodia, an herbal supplement South African bushmen have used for centuries to control hunger pangs while hunting game.

However, Jennifer Neily, a registered dietitian and spokesperson for the Dallas Dietetic Association, is skeptical.

Tests done on dietary supplements often show that consumers aren’t getting what they pay for-and sometimes they’re getting more than they bargain for, including strong prescription drugs like Viagra or steroids.