普通超市卖的多是Cassia Cinnamon(你吃的那个保健品好像也是它的提取物),这种肉桂大剂量的话可能会有肝肾毒性。
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).”