Propylene glycol (PG) is a colorless and odorless liquid chemical used for decades in a wide array of applications. A synthetic substance produced in industrial quantities, it is a relatively simple organic compound that has the chemical formula C3H8O2. The U.S. Food and Drug Administration consi...
Guaifenesin, just the expectorant, is also sometimes used by women trying to get pregnant. It softens, thins, and loosens all the body's mucus, not in your nose and throat, so it can help women who don't have good cervical fluid. But if you're taking it for that purpose, make sure...