Dietary cinnamon supplementation and changes in systolic blood pressure in subjects with type 2 diabetes

J Med Food. 2011 Dec;14(12):1505-10. doi: 10.1089/jmf.2010.0300. Epub 2011 Aug 23.


Experimental and some clinical evidence suggests that ingestion of cinnamon may improve metabolic measures in individuals with diabetes; however, few human studies have been designed to examine this association as their primary objective. In this study adult subjects 30 years of age or older with type 2 diabetes were randomized to treatment with 1,200 mg/day cinnamon or matched placebo. Blood pressure, hemoglobin A1c, fasting blood glucose, lipid profile, physical examination, and blood and urine chemistry were measured at baseline and at the 12-week follow-up end-of-treatment visit. In total, 59 subjects (40.7% female; mean age, 63.05±10.85 years) were recruited. Systolic blood pressure (SBP) declined from baseline values by 3.4±11.4 mm Hg in the cinnamon group and increased by 1.9±10.2 mm Hg in the placebo group (P=.06). In repeated-measures analysis, a significant by-treatment difference over time was detected (P=.02). However, when baseline SBP was included in the model as a covariate, change from baseline SBP was no longer associated with treatment. Although cinnamon added to the diets of spontaneously hypertensive rats has been shown to decrease SBP in a dose-dependent manner, results of the present study in humans suggest that the by-treatment difference in change-from-baseline SBP was a function of regression to the mean rather than a treatment-associated change.

Publication types

  • Randomized Controlled Trial

MeSH terms

  • Administration, Oral
  • Aged
  • Blood Pressure / drug effects*
  • Cinnamomum zeylanicum / chemistry*
  • Diabetes Mellitus, Type 2 / drug therapy*
  • Diet
  • Dietary Supplements*
  • Female
  • Follow-Up Studies
  • Glycated Hemoglobin A / analysis
  • Humans
  • Hypertension / drug therapy
  • Hypoglycemic Agents / pharmacology*
  • Male
  • Middle Aged


  • Glycated Hemoglobin A
  • Hypoglycemic Agents