Gastric Stress FormulaFormerly GI Feel Good GI Tonic* Often, during times of stress, the GI system is adversely affected. Gastric Stress Formula, a delicious liquid blend of traditional herbs to support a sense of calm, is designed to ease a nervous or upset stomach. With a soothing blend of Chamomile, Catnip and Lemon Balm, this great tasting tonic helps maintain the health of the GI tract, especially during peak stress.