Cocoa Flavanols

What it does

Cocoa flavanols are plant compounds in cacao that support nitric oxide and blood vessel function. The COSMOS trial tested a concentrated 500 mg/day cocoa extract, far more flavanols than chocolate can deliver without excess calories.

What the research says

• Reduced cardiovascular death in a large randomized trial (secondary endpoint)

  Evidence: moderate. COSMOS: 21,400 adults, 500 mg/day for 5 years. Primary endpoint (total CV events, -10%) missed significance; secondary analyses showed 27% lower cardiovascular death, 39% in adherent participants. Authors urge cautious interpretation. https://www.sciencedaily.com/releases/2022/03/220316173304.htm

• Lowers blood pressure and improves flow-mediated dilation

  Evidence: moderate. Multiple smaller placebo-controlled trials show meaningful blood pressure and arterial function improvements.

• May support cognitive function via blood flow

  Evidence: emerging. Small trials link flavanol intake to cerebral blood flow and attention measures; clinical significance unclear.

DRAFT: the largest trial in the category with an honest mixed result; primary endpoint missed, secondary signals real but need replication.

Is it worth it?

DRAFT: moderate cost for promising-but-unconfirmed hard outcomes; the blood pressure data alone is decent value.