Big effect
A meta-analysis of 49 trials linked cinnamon to a 1.04 standard-deviation drop in diastolic blood pressure — a large effect, though the individual studies were not blinded and the dose varied freely.
This is an unusually strong and consistent signal from a large body of evidence, but because none of the underlying trials required patients and researchers to be unaware of treatment, the true effect could be smaller than it appears; skeptical readers should treat the magnitude as tentative until blinded trials confirm it.
The analysis pooled data from 49 randomized controlled trials and found that taking cinnamon was associated with a large reduction in diastolic blood pressure (the bottom number) along with improvements in blood sugar, cholesterol, and inflammation. However, the studies themselves did not use blinding (no placebos were disguised), and the dose of cinnamon was not standardized across trials, so the reported effect size may be inflated by expectation bias.
Where this fits in the evidence
This is among the first studies we've indexed on Cinnamon for Reduced Diastolic Blood Pressure — treat it as an early signal until more research accumulates.
The study
- Meta-Analysis
- 2025-07-03
- Journal of health, population, and nutrition
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.