Daily cocoa intake reduces the susceptibility of low-density lipoprotein to oxidation as demonstrated in healthy human volunteers. Free Radic Res.
Cocoa flavanol intake improves endothelial function and Framingham Risk Score in healthy men and women: a randomised, controlled, double-masked trial: the Flaviola Health Study.
Cocoa avanol intake improves endothelial function and Framingham Risk. Score in healthy men and women: a randomised, controlled, double-masked. trial: the Flaviola Health Study.

Regular intake of high-flavonol cocoa may protect against brain aging and neurodegenerative diseases. Limitations and Recommendations. Best results from non-alkalized cocoa rich in polyphenols.
Observational studies support the benefits of cocoa flavanols. The link between blood pressure and high cocoa intake was described in a study of the Kuna Indians, an isolated tribe who live on the Caribbean Coast of Panama.

Allergy. An allergic reaction to cocoa will create symptoms such as hives, breathing difficulties, throat/ tongue/lip swellings, nausea or vomiting, stomach cramps or a cough.Unlike allergy, sensitivities are not life threatening and can easily be managed by monitoring intake.
Cocoa Intake, Blood Pressure, and Cardiovascular Mortality.