According to Healthline, cassia cinnamon has high amounts of coumarin, a chemical compound that has been linked in studies to liver damage (via Human & Experimental Toxicology) and an elevated likelihood of developing specific types of cancers or cancerous tumors (via Toxicology and Applied Pharmacology, Food and Chemical Toxicology, and the National Toxicology Program).
Because of these concerns, and other adverse side effects like mouth sores or breathing issues, the outlet advises eating no more than 0.05 milligrams of cassia per day for every pound you weigh. So a 150-pound person, for example, could tolerate 7.5 milligrams per day, or 3 teaspoons. The simple way to avoid doing the math, of course, is to eat only Ceylon, or true cinnamon. It's more expensive and less common, but available in many supermarkets and specialty stores.
This said, the recommended daily intake of cinnamon is much lower. Per WebMD, a daily intake of to 1 teaspoon of cinnamon per day is the limit, per some experts. This equals 2 to 4 grams of cinnamon a day, with the U.S. Department of Health saying that up to 6 grams of cinnamon per day is safe (via The Whole U).
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The Maximum Amount Of Cinnamon You Can Safely Eat Each Day - Tasting Table
