Brands including Slow Cow, Drank, Jones GABA, Mary Jane???s Relaxing Soda and OmegaChill are fortified with ingredients such as chamomile, melatonin and valerian root that purportedly promote calming; some take on the energy-drink category directly by claiming to also boost mental focus and concentration.SteviaA year after the U.S. FDA approved this no-calorie herbal sweetener for use in food and