Black Forest Cocoa Flavanol Supplementation and Health Trial

Inclusion Criteria: * Male participants aged 30 to 75 years. * Able and willing to provide written informed consent. * Generally healthy, as determined by medical history and screening assessments. * Willing and able to comply with all study procedures, including blood collection, daily study-product intake, and required study visits. * Willing to consume the assigned cocoa flavanol supplement or low-flavanol control product once daily for the duration of the study. * Willing to provide peripheral blood samples at baseline and at the end of the intervention. * Willing to maintain generally stable dietary, exercise, sleep, medication, and supplement habits during the study. * Willing to refrain from initiating new supplements, restrictive diets, fasting regimens, or major exercise programs during the study. * Not currently taking medications or supplements known to substantially affect vascular function, nitric oxide pathways, inflammation, oxidative stress, or coagulation, unless approved by the investigator. Exclusion Criteria: * Female biological sex. * Younger than 30 years or older than 75 years. * Known cardiovascular, metabolic, renal, hepatic, inflammatory, or autoimmune disease, including coronary artery disease, diabetes mellitus, chronic kidney disease, chronic liver disease, rheumatoid arthritis, or another clinically significant inflammatory disorder. * Hypertension requiring prescription medication. * Active infection, acute illness, or other clinically signif…