In a report of one patient, cinnamon was potentially linked to an increase in severity of the patient's rosacea, according to a report in the Journal of Drugs in Dermatology.1
Researchers Dr. Tracy Campbell and colleagues at Rush University Medical Center in Chicago reported that a woman with diabetes and mild papulopustular rosacea on the nose experienced a sudden spread of symptoms from her eyelids to her chin after using 500-mg cinnamon supplements to help control blood sugar levels.
Cinnamon has vasodilatory properties, the researchers noted, and can also provoke an allergic reaction in some.
Associated Reference
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Campbell TM, Neems R, Moore J. Severe exacerbation of rosacea induced by cinnamon supplements. Journal of Drugs in Dermatology. 2008;7:586-587.