Use of goldenseal may compromise glucose control in diabetics on metformin

Diabetic patients taking the natural product goldenseal while taking the prescription drug metformin may be unwittingly sabotaging their efforts to maintain healthy blood glucose levels. Metformin -- the world's most-prescribed oral glucose-lowering medication -- was included in a cocktail of selected drugs given to participants in a clinical study. The study found that after six days of taking goldenseal, participants had about 25 percent less metformin in their bodies.

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