Potion or Poison? Cinnamon

Abstract

SUMMARY MESSAGE: Although some trials suggest cinnamon may have a moderate effect in improving glycaemic status indicators, the literature is conflicting and strong scientific validation is lacking. Adverse effects of cinnamon are minimal; however, large doses over a long time period should be avoided. Cassia cinnamon may harm the liver in high doses and caution should be exercised in those with liver damage, concomitant use with drugs that affect the liver, and possibly blood-thinning medication. Patients should monitor their glucose levels, particularly if taking cinnamon with other medications or herbal supplements that may affect blood glucose.