Therapeutic potential of <i>Withania somnifera</i> (Ashwagandha): a comprehensive review of its phytochemical, pharmacological, and clinical applications

Withania somnifera, commonly known as Ashwagandha or “Indian ginseng”, is one of the most important medicinal plants in Ayurvedic tradition, historically used as a rejuvenating tonic (rasayana) to promote vitality, stress resilience, and longevity. In recent years, scientific interest in Ashwagandha has grown significantly, particularly for its potential applications in managing stress, chronic fatigue, cognitive decline, and various inflammatory and metabolic disorders. Several preclinical and clinical studies suggest that Withania somnifera exhibits adaptogenic, anti-inflammatory, antioxidant, immunomodulatory, and neuroprotective activities, primarily attributed to the presence of withanolides, alkaloids, and flavonoids. However, despite encouraging findings, much of the current evidence stems from small-scale studies with heterogeneous methodologies, variable dosages, and inconsistencies in the standardization of extracts. Moreover, in some cases, clinical efficacy appears to fall short of expectations, with outcomes not always reaching statistical significance compared to placebo. This review critically examines the pharmacological properties and proposed mechanisms of action of Withania somnifera's bioactive compounds, while highlighting both its therapeutic potential and the methodological limitations present in current research. The review was conducted using databases such as PubMed, ScienceDirect, HerbMed, and Google Scholar. Although Ashwagandha remains a promising candidate in the context of integrative medicine, larger and longer-term clinical trials are needed to confirm its effectiveness and to better define its safety profile.