A high purity Withania Somnifera extract composition in the form of a high purity, stable, free-flowing, light yellow-to-brown herbaceous powder, for producing an enhanced cognition effect for the user and to augment the learning facility in the geriatric population when taken in a dosage of 200-800 mg/day. This extract contains, by weight, (a) at least 3% of withanolide glycosides and sitoindosides, preferably 3-8%, (b) at least 3% of oligosaccharides, preferably 3-8%, preferably a molecular weight of 2000, and (c) less than 0.5% of free cytotoxic withaferin A (aglycone), wherein the ratio of (a):(c) is 75-95:25-5, and the ratio of (a):(b) is 40-60:60-40. An extraction process for obtaining such extract composition, and pharmaceutical and nutritional use products thereof, also are described.
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