Cinnamon

Cinnamon has anti-inflammatory properties.

It can be taken systemically in the spice form, or applied topically as an essential oil. When used as an essential oil, it must be diluted with a carrier oil, or it will burn the tissue.

Other benefits

Cinnamon has neuroprotective properties: Alzheimer's prevention:
“Two compounds found in cinnamon appear to inhibit the buildup of a protein called tau in the brain, which is one of the hallmarks of Alzheimer’s disease.”

Parkinson’s prevention:
“In a study in mice with Parkinson’s disease, cinnamon helped protect neurons, normalized neurotransmitter levels, and improved motor function.”

Source: Healthline.

Dosage

Most stores only sell the cheaper type of cinnamon, Cassia, which can only be taken in small doses. "Cassia cinnamon contains high amounts of coumarin, which can cause liver toxicity and damage if consumed in high amounts."

The more expensive type of cinnamon without these negative effects is called Ceylon.

For the cheaper cinnamon, Cassia, 1\2 a teaspoon per day would be too much. (Source?)

Source: Healthline.