Yes. Cinnamon, in the required dosage, is considered as safe.
FDA has determined Cinnamon to be GRAS (Generally Recognized As Safe) as a food additive – see FDA link
While Cinnamon is commonly regarded as a healthy, natural spice and delicious condiment, occasional side effects may occur when taking it, and allergies may occur.
If you are allergic to Cinnamon, it is highly recommended that you refrain from taking it in any form.
Ceylon and Cassia Cinnamon both contain Coumarin. When Coumarin is consumed in extremely high doses, it may cause some dangerous side effects. Ceylon Cinnamon contains far less Coumarin than Cassia Cinnamon. Coumarin does not dissolve in an aqueous solution and therefore is not practically found in the aqueous cinnamon extract.
We recommend to follow preparation instructions with Ceylon Cinnamon at recommended doses.
However, as a spice, it would be unusual for someone to consume large enough amounts of either type of Cinnamon to cause concern.
Always talk to your doctor before making significant changes to your diet.