The Better Business Bureau suggests watching out for weight-loss schemes.
The group says in 2006, it took 40-percent more of these complaints than it did in 2002.
Among the companies people complained about were Metacor/Progenics Inc., Wu-Yi Source, Changes International and Advanced Lipo-Dissolve Center, LLC; Fig Corporate, LLC and Go Fig, Inc.
Most are accused of making it hard or impossible for customers to get a refund.
The agency wants you to research the reputation of a company offering weight loss solutions before buying in.