If you are curious about underwear that carries caffeine, aloe vera and vitamin E and claims to help you shed extra kilos by just wearing them for few days, read this.

The US Federal Trade Commission (FTC) has issued an enforcement order against two such US brands that claim caffeinated underwear will make your behind smoother and slimmer, wired.com reported.

"The companies deceptively advertised, marketed and sold women's undergarments infused with micro-encapsulated caffeine, retinol and other ingredients," the order read.

"The company made claims that wearing its shapewear would eliminate or substantially reduce cellulite; reduce the wearer's hip measurements by up to two inches and their thigh measurements by one inch; and reduce thigh and hip measurements without any effort," it added.

The developers of such underwear claim that caffeine promotes fat destruction.

The FTC also ruled that the trials relied upon to make these claims were faulty.

"Any claim that a product worn on the body causes substantial weight loss is always false," it added.

Caffeine is both water and fat soluble; that's how it gets into your skin.

That also means that when is is washed, lots of the caffeine will be washed out of the fabric, the report added.