Ashwagandha (Withania somnifera)

In classical Ayurvedic household practice, only the dried, starchy winter root (Nagori Ashwagandha) was pounded into a fine churna and simmered with milk and a pinch of raw sugar or ghee before sleep.

It was traditionally reserved for periods of convalescence, physical exhaustion, and dry winter months — viewed as a slow, grounding root rather than a quick daytime stimulant.

Leaves were historically used only for external poultices, never internal tonics — a distinction many modern budget capsule brands ignore.

Human randomized trials (typically using 300–600 mg/day of root-only extract standardized to ~5% withanolides over 8–12 weeks) have examined perceived stress scores, salivary cortisol, and sleep quality metrics.

While several small-to-medium clinical trials report modest improvements in subjective stress and sleep onset, results depend heavily on extract standardization (HPLC vs gravimetric testing) and root-only purity.

Ashwagandha is not a sedative drug or a treatment for clinical anxiety or insomnia disorders. Rare case reports of reversible liver enzyme elevation have been documented in national pharmacovigilance registries.

This is where most buyers get quietly cheated. Cheap ashwagandha powder is easy to bulk out or sell old — here is what separates genuine material from the filler:

1. Root-only vs root-plus-leaf: check the Supplement Facts panel for "Ashwagandha (Withania somnifera) (root)". If the plant part is omitted, cheaper leaf material is often present.

2. Assay method: reputable extracts specify ~2.5% to 5% withanolides measured by HPLC. Claims of "10%–20% withanolides" almost always rely on leaf adulteration or USP gravimetric inflation.

3. Smell and taste: authentic root powder has a mild, horsey, starchy aroma and slightly bitter-earthy taste. Intensely acrid, grass-bitter powder points to leaf content.

4. Withaferin A limit: quality root extracts keep cytotoxic Withaferin A low (<0.1%), whereas leaf-heavy extracts contain significantly higher levels.

5. Heavy metal COA: as a root crop grown in dry soils, batch-specific testing for lead, arsenic, cadmium, and mercury is essential.

6. Avoid proprietary blends: verify that the exact milligram weight of the root extract is printed clearly on the label.

• Avoid during pregnancy and breastfeeding; historical texts and modern monographs classify high-dose Ashwagandha as contraindicated in pregnancy.
• Thyroid caution: Ashwagandha may increase circulating thyroid hormone levels (T3/T4). Anyone with hyperthyroidism or taking levothyroxine/thyroid medication should consult an endocrinologist first.
• Autoimmune and hepatic conditions: stop use immediately and consult a physician if you experience dark urine, jaundice, or unexplained fatigue.
• Because it is belongs to the Solanaceae (nightshade) family, individuals with nightshade sensitivities should exercise caution.

Whole Nagori ashwagandha roots break with a clean, chalky-white snap and grind into a pale cream-colored powder. Whenever a commercial capsule opens to reveal a dark greenish-brown powder, you are looking at leaf extract or scorched processing — not pure winter root.

• NIH Office of Dietary Supplements — Ashwagandha Fact Sheet for Health Professionals
• NCCIH / NIH — Ashwagandha: Usefulness and Safety

This guide is editorial reference content, not medical advice, and describes Ashwagandha as a food and traditional ingredient. It does not diagnose, treat, cure, or prevent any disease. Talk to a qualified doctor before starting any supplement. Last updated 2026-10-20.