 It's the number one FDA-approved asthma inhaler available over-the-counter. Primatine Mist. Breathe easy again. Use as directed. Yield results show that making in-season applications of biologicals pays. I'm Darren Hefty with Hefty Naturals. Amass is a biostimulant package designed to be applied to corn and soybeans just as the reproductive stages begin. By boosting development at this timing, Amass helps your crop maximize yield potential at harvest.