Neuroprotective potential of cocoa flavanols: Molecular insights, translational and clinical challenges

Cocoa is a rich source of flavonoids, particularly flavanols, known for their antioxidant, anti-inflammatory, and cardiovascular benefits. Emerging evidence suggests that cocoa flavanols may also exert neuroprotective effects, although clinical validation remains limited. This narrative review with critical synthesis elements summarizes current evidence on the impact of cocoa flavanols on brain health based on experimental and human studies. Data were collected from major scientific databases, including PubMed, Web of Science, ScienceDirect, and the Directory of Open Access Journals. Preclinical and early clinical evidence suggests that cocoa flavanols may support cognitive function and potentially contribute to neuroprotection through modulation of oxidative stress, neuroinflammation, and neuronal signaling pathways. However, the causal relevance of these mechanisms in humans remains incompletely understood. Mechanistically, cocoa flavanols may activate nuclear factor erythroid 2-related factor 2 (Nrf2) pathway, suppress pro-inflammatory cytokines such as tumor necrosis factor-alpha (TNF-α) and interleukin-6 (IL-6), and enhance neurotrophic factors including brain-derived neurotrophic factor (BDNF). Emerging evidence also suggests that cocoa itself possesses potential neuroprotective properties, which may be further enhanced when combined with other bioactive compounds such as vinpocetine, guarana extract, spirulina, and pineapple. However, well-designed long-term clinical trials are still needed to confirm their therapeutic potential for brain health.