Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Ashwagandha (KSM-66) | Holy Basil (Tulsi) | |
|---|---|---|
| Category | Adaptogens | Adaptogens |
| Standard Dose | 600mg KSM-66 daily (300mg 2x/day) | 500-1000mg daily (standardized extract) or 300mg of high-potency extract |
| Timing | Morning and evening with meals. Evening dose supports sleep quality via cortisol reduction. | Morning and/or evening with meals. Tulsi tea form is also traditional. |
| Cycle Duration | Cycle 8-12 weeks on, 2-4 weeks off (to prevent adaptogenic tolerance) | Cycle 8-12 weeks on, 2-4 weeks off, or ongoing at lower doses |
| Evidence Level | strong_human | moderate_human |
Ashwagandha's primary bioactives are withanolides (particularly withaferin A and withanolide D). KSM-66 is a full-spectrum root extract standardized to >5% withanolides. It modulates the HPA axis by reducing cortisol output (20-30% reduction in trials), likely through GABAergic activity (withanolides are GABA-mimetic at GABA-A receptors) and by normalizing cortisol receptor (GR) sensitivity. It also inhibits the NMDA-induced neurotoxicity pathway, enhances DHEA-S production, promotes thyroid function (increases T4 to T3 conversion), upregulates antioxidant enzymes (SOD, catalase, glutathione peroxidase), and has demonstrated sirtuin-activating properties.
600mg KSM-66 daily (300mg 2x/day)
Morning and evening with meals. Evening dose supports sleep quality via cortisol reduction.
Cycle 8-12 weeks on, 2-4 weeks off (to prevent adaptogenic tolerance)
Holy Basil (Ocimum tenuiflorum) contains eugenol, rosmarinic acid, ursolic acid, and ocimumosides. Eugenol inhibits COX-2 and 5-LOX, providing anti-inflammatory effects. Ursolic acid activates AMPK and inhibits NF-kB. Ocimumosides (A and B) exhibit anti-stress activity by normalizing corticotropin-releasing hormone (CRH) and cortisol levels. Holy Basil also inhibits cortisol synthesis at the adrenal level, modulates GABAergic and serotonergic neurotransmission, has adaptogenic effects via normalization of hypothalamic-pituitary-adrenal axis, and exhibits hypoglycemic action via enhanced insulin secretion and peripheral glucose uptake.
500-1000mg daily (standardized extract) or 300mg of high-potency extract
Morning and/or evening with meals. Tulsi tea form is also traditional.
Cycle 8-12 weeks on, 2-4 weeks off, or ongoing at lower doses
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