Dr Shades Bitters no.9 50mlQuicksilver Scientific Dr Shades Bitters No 9 Bitter herbs broadly encompass many botanicals, but are most often thought of as herbs with effects on the gastrointestinal system. Herbal bitters have a long history of use, and are commonly used in cocktails known as aperitifs and digestifs which are served before and after meals to stimulate appetite and digestion. However, bitter herbs act far beyond the digestive system, and may impact the liver,