Dietary companies are breaking the law by selling pills that falsely claim to protect people from the sun’s harmful rays, prompting the Food and Drug Administration to issue a slew of warning letters.

The letters have gone out to Advanced Skin Brightening Formula, Sunsafe Rx, Solaricare, and Sunergetic. The FDA says the companies’ description of the pills are giving people a false sense of security, because they don’t protect people against skin cancer, sunburn, or early aging caused by the sun, as they claim on their labels and packaging.