Cinnamon supplementation significantly decreases inflammation and oxidative stress levels, serving as a potential additive for cardiometabolic health improvement.
The systematic review and meta-analysis followed the Preferred Reporting Items of Systematic Reviews and Meta-Analysis guidelines. A comprehensive search for appropriate clinical trials was performed across multiple databases including PubMed/MEDLINE, Scopus, Cochrane Library, Web of Science, Embase, and Google Scholar until January 2020. After duplicates were removed, 1145 studies were found eligible and 12 studies were finally included in the meta-analysis, investigating the impact of cinnamon supplementation dosages ranging between 1.5 to 4 grams per day.
The results of the meta-analysis revealed that cinnamon supplementation led to a significant reduction in inflammation markers, C-reactive protein and interleukin-6, alongside a decrease in malondialdehyde, an oxidative stress marker. Concurrently, an increase was observed in the total antioxidant capacity following the supplementation, implying an enhancement in the body's defensive ability against oxidative damage. Nevertheless, no significant change was identified in the levels of intercellular adhesion molecule-1 after the cinnamon supplementation.
