Can You Take Metformin and St. John's Wort Together?

What the interaction means

Metformin's FDA label does not mention St. John's Wort. NCCIH's St. John's Wort page does not mention metformin.

No documented interaction between Metformin and St. John's Wort was identified in the authoritative sources reviewed. This is not a guarantee that no interaction exists for every dose, formulation, or individual -- it means the sources checked did not document one.

Practical context

Both substances' own current authoritative sources were checked directly, in both directions.

What the sources say

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