Enhances gastrointestinal health and defense *The herbal extracts found in A.P. Formula have each been used for hundreds of years to help maintain healthy intestinal function. Berberine is a quaternary alkaloid that may support healthy immune system function and upper respiratory tract health. Studies suggest that berberine may also promote fungal and microbial balance, as well as support healthy digestion and GI comfort. Ginger and gentian also promote healthy GI function, in part by supporting gastric juice production. Garlic and quassia extracts help to promote healthy microflora and optimal gut ecology. Pure Encapsulations A.P. Formula® provides a concentrated formulation of herbs to support respiratory, genitourinary and gastrointestinal tract health.