What's the optimal dosage? Even though the overview in Figure 1 suggests that "more helps more", Anand, et al. (2010) observed negative effects on the liver of rodents at dosages that would tantamount to ~40g of cinnamon per day. Ok, I assume you already apprehended that this is madness, but in the world of fitness maniacs and mad bodybuilders I thought it would be worth mentioning that even the coumarin free Ceylon cinnamon appears to have ill side effects when it is consumed in extremely high dosages. It would thus appear to be more reasonable to target an intake of 3-6 g of cinnamon with every major meal (it slows down gastric emptying and reduces postprandial blood glucose, therefore it makes sense to take it with a meal