St. Francis Barberry Tincture, Berberine-Containing Bitter Tonic for Digestive Tract Problems, 50ml Licorice It is a cofactor in

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St. Francis Barberry Tincture, Berberine-Containing Bitter Tonic for Digestive Tract Problems, 50ml Licorice It is a cofactor inSt. Francis Barberry Tincture Details Our Barberry Tincture works as a bitter tonic and helps relieve digestive tract problems. Barberry's active is berberine, the bright yellow alkaloid that also gives goldenseal and Oregon grape their colour and much of their reputation. Berberine has become one of the more researched plant compounds in recent years, though barberry's traditional use as a bitter digestive tonic considerably predates that interest.