Metformin

Metformin (Glucophage) is a metabolic medicine in the antidiabetics family. This page provides educational reference about questions involving other medicines or supplements taken alongside it. It is not medical advice; questions related to a medical condition or treatment are best discussed with a clinician.

The main concern is additive glucose lowering. Bacopa Monnieri, Chaga, Panax Ginseng, and Shilajit may increase metformin’s glucose-lowering effect, which could raise the risk of low blood glucose. The evidence is not equally strong: the concern for Bacopa Monnieri is preclinical and lacks human evidence, while the evidence for Chaga comes from animal studies. Blood glucose monitoring and discussion with a healthcare provider or pharmacist are appropriate before combining these products with metformin.

Several other combinations may also require monitoring rather than being treated as established harmful interactions. Alpha-Lipoic Acid (ALA), American Ginseng, Apple Cider Vinegar, Berberine, and Psyllium Husk may have additive effects on glucose control. The clinical importance is uncertain for some combinations, and the benefit of combining Berberine with metformin is not established. Inositol is commonly combined with metformin in PCOS and insulin resistance protocols, based on complementary effects on insulin sensitivity and ovulatory function.

Vitamin B12 (Cobalamin) is a separate, longer-term consideration: metformin can reduce B12 absorption, and long-term use can cause B12 depletion. Coenzyme Q10, Curcumin, and Green Tea Extract (EGCG) have reported combination findings, but these should not be treated as broadly established benefits; the findings vary from animal research to specific clinical contexts. A clinician or pharmacist can help interpret these combinations alongside the person’s treatment and glucose monitoring needs.