cinnamon sticks and ground cinnamon

Q. I recently read that nutmeg can be poisonous in large doses when it is used as a folk remedy. Is the same true of cinnamon? I use a large amount of cinnamon on my oatmeal every morning, probably about a teaspoonful. Is this harmful?
A. Cinnamon sometimes contains a compound called coumarin. At high doses over a long period of time, coumarin may cause liver inflammation. It may also have blood-thinning activity and might interact with the anticoagulant Coumadin (warfarin).
Cinnulin PF is a water-soluble extract of cinnamon that does not contain coumarin. These capsules appear to be safe and may help control blood sugar levels.

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  1. JB

    I read in your column the suggestion of cinnamon and honey for a daily treatment against arthritis pain. I started this about 2 months ago and have had some relief in my hands but no noticeable effect in other joints. I am happy for the relief I have gotten and continue to take a teaspoon the cinnamon with 2-3 tsp of honey daily. My question now is could the cinnamon effect my hormones levels? I am 53 years old and have not had a menstrual period in over 4 years until mid-August and now (9-15-10) I have begun another!

  2. Lydia

    Can too much cinnamon cause kidney failure?

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