Dosage guide
Ashwagandha dosage
Ashwagandha dosing: typical range, frequency, half-life, onset, routes. Evidence-tiered.
At a glance
- Typical dose
- 600mg
- Half-life
- 10hr
- Frequency
- daily
- Routes
- oral
Protocol
- 1
Measure the dose
Typical Ashwagandha dose is 600 mg. Use a weight-based calculator for individual adjustments.
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- 3
Cycle if needed
Commonly used continuously for 8 to 12 weeks in RCTs; no formal cycling requirement established
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Monitor for side effects
Watch for: mild GI upset; drowsiness; headache. Stop or reduce dose if tolerability breaks down.
Why this dose
GABAergic modulation and HPA-axis attenuation; withanolides reduce cortisol secretion and inhibit NF-kB signaling.
The typical 600 mg dose is the figure most commonly used in published protocols for Ashwagandha. Treat the label as a starting point: body weight, training status, sleep, diet, and concurrent medications all shift the effective dose-response curve in real users.
How to administer
Ashwagandha is administered via the oral route. Oral dosing is straightforward: take with water, with or without food unless specifically noted.
Onset of action runs around 2 hours after administration. Plan the administration window so that peak effect lines up with whatever outcome you are dosing for, whether that is training, sleep, or symptom coverage.
Half-life note: Withanolide pharmacokinetics vary by extract; withaferin A ~7 to 10 hours in preclinical models
Cycling and tolerance
Commonly used continuously for 8 to 12 weeks in RCTs; no formal cycling requirement established
Effects to expect at typical dose
- Reduces morning serum cortisol by ~20 to 30% at 300 to 600 mg/day standardized extract over 8 weeks
- Lowers subjective stress on DASS-21 and PSS scales versus placebo in chronically stressed adults
- Modest grip-strength and 1-RM gains of ~5 to 8% in trained men when paired with resistance training
- Improves self-reported sleep quality and onset latency in adults with insomnia symptoms
- Small testosterone increases (~10 to 15%) reported in stressed or subfertile men, less clear in healthy populations
- May raise free T3 and T4; can interact with levothyroxine and unmask subclinical hyperthyroidism
Best-graded outcomes
- B Morning serum cortisol : 20 to 30% reduction at 300 to 600 mg/day (Chronically stressed adults).
- B Subjective stress scores (DASS-21, PSS) : Consistent reductions versus placebo over 8 weeks (Mild to moderate stress).
- B Anxiety scores (HAM-A, BAI) : Consistent decreases on HAM-A across RCTs (Generalized anxiety symptoms).
Side effects and interactions
Common side effects
- mild GI upset
- drowsiness
- headache
Notable interactions
- benzodiazepines (moderate): additive CNS depression
- thyroid hormone (levothyroxine) (moderate): may raise T3/T4, altering dose requirements
- immunosuppressants (moderate): theoretical antagonism via immune stimulation
Lists above cover commonly reported and well-characterized items. They are not exhaustive: review the full Ashwagandha profile and discuss with a clinician familiar with your medication list before starting, particularly if you are on prescription therapy or have a chronic condition.
Regulatory snapshot
- WADA status
- allowed
- DEA / Rx
- OTC supplement
- Pregnancy
- Not recommended
- Legal status
- Dietary supplement in most jurisdictions; regulated in Denmark
Do not use if
- pregnancy
- autoimmune disease (theoretical immune stimulation)
- hyperthyroidism
- concurrent sedative use
Related calculators
Related research