A Yuge dash of cinnamon in the nightly oatmeal drops my fasting glucose at least 10 pts. “Messing with” your medications may mean that the cinnamon doesnt stop your meds from working as expected?
In some case it may intensify or amplify the medications response.
Like I can’t eat grapefruit or drink grapefruit juice because there is something in it that will make my blood pressure medicine intensify and could drop my blood pressure to much.
So you have to be careful when taking herbals and ‘natural’ remedies.
After all, they are essentially medications, too!...........