Claims made by both are, at best, false.
At worst, they could be harmful. Metabolite bases its formula on hydroxycitric acid, a compound little studied in people. Metabolite, produced by a company called AIM, is widely marketed through pyramid-type schemes. HCA is a close relative of citric acid, the component that gives oranges, lemons, limes and other citrus fruits their characteristic tart flavor. Citric acid is widely distributed throughout the plant kingdom.