普通超市賣的多是Cassia Cinnamon(你吃的那個保健品好像也是它的提取物),這種肉桂大劑量的話可能會有肝腎毒性。
https://www.healthline.com/nutrition/ceylon-vs-cassia-cinnamon
“Cassia Contains Coumarin, Which Can Be Toxic
Coumarin is a compound found naturally in several plant species. It can be harmful in large doses. In rodents, coumarin is known to cause kidney, liver and lung damage. It may even cause cancer. In humans, there are isolated incidents of similar effects (11, 12).
In fact, the Tolerable Daily Intake (TDI) of coumarin used to be 0.2 mg/lb (0.5 mg/kg) of body weight. It has now been reduced to 0.05 mg/lb (0.1 mg/kg) (11).”