Nootropics: Mechanistic Insights, Experimental Models and Advances in Herbal Drug Discovery

Memory and cognitive functions are essential for daily life, with disruptions leading to significant neurodegenerative and psychiatric conditions. Cognitive dysfunction arises from various pathophysiological mechanisms, including neurotransmitter imbalance, impaired cerebral blood flow, oxidative stress, and reduced synaptic plasticity. Nootropics, also known as cognitive enhancers, have gained attention for their potential to improve memory, attention, and learning by targeting these mechanisms. These agents’ activity via diverse pathways such as cholinergic enhancement, neuroprotection, mitochondrial support, and modulation of neurotrophic factors. Synthetic nootropics like donepezil and piracetam are commonly used, although they may present side effects. In contrast, natural nootropics derived from medicinal plants like Bacopa monnieri, Gingkobiloba, and Panax ginseng offer neuroprotective effects with potentially better safety profiles. Experimental models including pharmacological, in vivo, in vitro, and in silico approaches are vital for evaluating the efficacy and mechanisms of nootropic agents. Advances in computational methods and omics technologies have accelerated plant-based drug discovery, enabling better understanding of molecular mechanisms and synergistic effects of phytoconstituents. Despite progress, challenges persist, including standardization of plant extracts, poor bioavailability, and lack of rigorous clinical validation. This review highlights the classification, mechanisms, and evaluation models of nootropics, while discussing the challenges and opportunities in herbal cognitive enhancer development. Bridging traditional knowledge with modern scientific approaches hold promise for the discovery of safe and effective nootropic agents.