Cardiovascular diseases (CVDs) remain a major global health burden, emphasizing the need for effective preventive strategies. Polyphenols in Aronia melanocarpa (AM) have emerged as promising candidates due to their potent antioxidant and anti-inflammatory properties. This study evaluated the effectiveness of standardized AM extract supplementation in mitigating CVD risk factors through a 6-week pilot randomized human trial and in vitro experiments. The human trial demonstrated significant reductions in total cholesterol, LDL cholesterol, and alanine aminotransferase (ALAT) levels in the supplemented group. In vitro studies confirmed AM extract's antiinflammatory effects, as indicated by reduced pro-inflammatory cytokines and adhesion molecules in human endothelial cells (HUVECs) and human peripheral blood mononuclear cells (PBMCs). Additionally, AM extract exhibited strong antioxidant activity and enhanced nitric oxide (NO) production in cells. These findings underscore the potential of AM extract to improve lipid profiles, vascular function, and liver health, supporting its role in CVD prevention and management.