Can I Take cinnamon with metformin?

SUMMARY:

Cinnamon can have blood-glucose–lowering effects, so taking it together with metformin may increase the chance of low blood sugar; consult a clinician before combining, especially if using concentrated cinnamon supplements.

ADDITIONAL NOTES:

Interaction type: additive glucose-lowering effect. Risk: increased likelihood of hypoglycemia (symptoms: sweating, shaking, dizziness, confusion). Practical advice: monitor blood glucose more frequently if you start or stop cinnamon (especially concentrated supplements), do not change metformin dose without clinician guidance, and inform your prescriber about all herbal supplements. Higher risk in older adults, those with kidney impairment, or when other antidiabetic drugs are also used.