Quassia Bark is a common bittering agent for cocktail bitters, aperitifs, digestifs, and occasionally soft drinks. Its bitterness is a little reminiscent of hops, and for that reason it is sometimes used in brewing as well.
The Silk Road’s line of botanical roots and herbs is meant for flavouring infusions such as bitters, root beers, teas, syrups, and other similar things. These products are not sold or recommended for medicinal purposes.