Oregon grape (Mahonia aquifolium) is a bitter herb from western North America. Indigenous peoples and herbalists have long used its berberine-rich roots as a digestive tonic. The bitterness stimulates appetite and encourages bile flow, which supports digestion before meals. Topical creams and ointments containing Oregon grape are also applied to mild skin complaints such as eczema, though clinical evidence here remains thin.
Common forms include tinctures, capsules, and dried-root tea, usually taken before eating. The berberine in Oregon grape can affect blood sugar levels and may interact with medications, so proceed with care.
Strong evidence for systemic immune benefits is lacking. The herb’s most recognized roles stay centered on digestive support and external skin applications.