Big effect

Regular cocoa flavanols tied to a 24% lower risk of developing hypertension — but only in older adults whose blood pressure was already in the healthy range.

This is the first large, long-term randomized trial to hint that cocoa might help *prevent* the early stages of blood-pressure rise, but the effect was seen in a narrow subgroup (those with optimal starting BP), and the overall trial result was neutral, so the finding is intriguing but far from settled.

In a 3.4-year trial with 442 older adults, those who took 500 mg/day of cocoa flavanols (containing 80 mg epicatechin) were 24% less likely to develop high blood pressure, but only if their blood pressure was already below 120 mm Hg at the start. For the whole group, the supplement didn't significantly lower the overall risk of developing hypertension, so the benefit appears limited to people with already healthy blood pressure.

Where this fits in the evidence

This is among the first studies we've indexed on Cocoa for Reduced Incident Hypertension — treat it as an early signal until more research accumulates.

The study

Long-Term Effect of Cocoa Extract Supplementation on Incident Hypertension.

Randomized Controlled Trial (RCT)
n = 442
2025-10
Hypertension (Dallas, Tex. : 1979)

More on Cocoa More on Reduced Incident Hypertension

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