Makers of undergarments infused with minerals and nutrients that are promised to improve the wearer’s physique and skin tone are feeling the squeeze of litigation.

Maidenform Brands and Wacoal America face three class-action suits over claims about shapewear made of Novarel Slim, a “cosmetotextile” embedded with microcapsules of caffeine to promote fat destruction, ceramides to restore and maintain the skin’s smoothness and retinol to make the skin firmer.