Quick Comparison

AshwagandhaGotu Kola
Half-Life6-12 hours (withanolides)2-4 hours (asiaticoside, madecassoside)
Typical DosageKSM-66 extract: 300-600 mg daily. Sensoril extract: 125-250 mg daily. Root powder: 3-6 g daily. Best taken with food. Can be taken morning or evening (does not cause drowsiness in most people).Standard: 500-1000 mg standardized extract daily (triterpenes: asiaticoside, madecassoside). Traditional dose: 1-2 grams dried herb as tea. ECa 233 is a well-studied standardized extract. Can be taken morning or evening — mild enough for bedtime use.
AdministrationOral (capsules, powder). Standardized extracts (KSM-66 or Sensoril) are preferred over raw root powder for consistent dosing.Oral (capsules, extract, tea, tincture). ECa 233 standardized extract for consistent dosing.
Research Papers9 papers9 papers
Categories

Mechanism of Action

Ashwagandha

Ashwagandha's withanolide compounds (withaferin A, withanolide A, withanone) modulate the hypothalamic-pituitary-adrenal (HPA) axis, reducing corticotropin-releasing hormone (CRH) and adrenocorticotropic hormone (ACTH) signaling, thereby lowering cortisol production by 25-30% in stressed individuals. It acts as a GABA-A receptor positive allosteric modulator at the benzodiazepine site, producing anxiolytic effects without sedation. Ashwagandha inhibits acetylcholinesterase (AChE), raising acetylcholine levels in the hippocampus and cortex. The withanolides have anti-inflammatory properties via inhibition of NF-κB and COX-2, and antioxidant effects that reduce neuroinflammation and oxidative stress. It may support neurogenesis through upregulation of BDNF and its receptor TrkB, and modulation of the PI3K/Akt pathway.

Gotu Kola

Triterpene saponins (asiaticoside, madecassoside, asiatic acid, madecassic acid) are the primary bioactives. They increase BDNF expression in the hippocampus via CREB and ERK/MAPK pathways, promoting neuroplasticity, synaptogenesis, and memory formation. They enhance collagen type I synthesis through stimulation of fibroblasts and improve microcirculation via VEGF and angiopoietin modulation. Anxiolytic effects occur through positive allosteric modulation of GABA-A receptors (possibly at the benzodiazepine or neurosteroid site) and reduction of acoustic startle response (amygdala modulation). Gotu kola inhibits acetylcholinesterase (AChE), mildly increasing synaptic acetylcholine. Anti-inflammatory effects come from NF-kB inhibition (IkB stabilization) and TNF-alpha suppression. Asiatic acid may also activate PPAR-gamma.

Risks & Safety

Ashwagandha

Common

Gastrointestinal discomfort, drowsiness at higher doses, thyroid hormone elevation.

Serious

Can cause hyperthyroidism in susceptible individuals — avoid with thyroid conditions without medical oversight. Rare liver injury reports.

Rare

Vertigo, nasal congestion, sexual dysfunction.

Gotu Kola

Common

Very well-tolerated. Mild GI upset, drowsiness.

Serious

Rare hepatotoxicity reported — avoid with liver disease and limit use to 6-week cycles.

Rare

Headache, dizziness, skin sensitivity to sunlight.

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