Ashwagandha vs Shankhpushpi for Anxiety

Two Ayurvedic heavyweights, two very different evidence stories. Ashwagandha (Withania somnifera) has some of the best anxiety-trial data of any herb — randomized trials measuring validated stress scales and cortisol. Shankhpushpi (Convolvulus pluricaulis, officially; regionally Evolvulus alsinoides or Clitoria ternatea) is a classic medhya rasayana used for mental calm, but its human evidence is mostly open-label. If anxiety is the goal, the comparison isn't close on evidence — but shankhpushpi's traditional role and safety profile make it worth understanding. Here's the honest breakdown.

Head-to-Head Comparison Table

Ashwagandha for Anxiety: The Trial Record

Ashwagandha's anxiety evidence is genuinely trial-backed, which sets it apart:

• Chandrasekhar et al. 2012 — randomized, double-blind, placebo-controlled trial (n=64); 300 mg high-concentration full-spectrum root extract twice daily for 60 days reduced Perceived Stress Scale scores by 44.0% (vs 5.5% placebo, p<0.0001) and serum cortisol by 27.9% (vs 7.9% placebo, p=0.002).
• Salve et al. 2019 — 8-week RCT in 60 stressed adults (baseline PSS >20); 250 mg and 600 mg/day of root extract both reduced PSS scores and cortisol vs placebo (greater effects at 600 mg) and improved sleep quality.
• Pratte et al. 2014 — systematic review of 5 human RCTs of ashwagandha for anxiety/stress: all five reported greater score improvements than placebo, but unclear/high risk of bias and heterogeneous design prevented a meta-analysis, so the evidence should be treated with caution.
• Langade et al. 2019 — double-blind, randomized, placebo-controlled study (n=60; 40 test, 20 placebo) in adults with insomnia and anxiety; 300 mg root extract twice daily for 10 weeks improved sleep-onset latency, sleep efficiency, sleep quality, and Hamilton Anxiety (HAM-A) scores vs placebo at 10 weeks (5-week sleep-onset latency did not separate from placebo).
• Extracts: trials used named standardized extracts — KSM-66 (root-only, ≥5% withanolides) and Sensoril (root+leaf, ≥10% withanolides). No direct head-to-head anxiety trial of KSM-66 vs Sensoril has been published, so superiority claims for either extract are unsupported.

The pattern: effects were measured at 8–10 weeks on validated scales — not just "feels calmer" anecdote. Interim trial timepoints (Salve's 4-week PSS, Langade's 5-week sleep-onset latency) did not separate from placebo, so a 2–4-week onset claim isn't supported by the trial data.

Shankhpushpi for Anxiety: Tradition vs Trials

Shankhpushpi's calming reputation is traditional rather than trial-established. It is one of Ayurveda's classic medhya rasayanas (brain tonics); traditional use centers on mental calm, reducing stress and anxiety, and insomnia (ADDF Cognitive Vitality dossier). The human studies identified in published reviews are open-label, without placebo control — ADDF's search found 2 open-label clinical studies and no randomized controlled trials of shankhpushpi at all.

That's not nothing — open-label studies still report symptom improvement — but it's a fundamentally weaker evidence tier than ashwagandha's placebo-controlled trials with validated scales and biomarker (cortisol) data.

Honest framing: if someone finds shankhpushpi calming, the traditional use case supports that experience; but for evidence-based anxiety management, ashwagandha is the defensible first pick between the two.

⏱ Which Works Faster?

Ashwagandha: trial timepoints show benefits at 8–10 weeks, with no trial demonstrating an earlier onset — interim measures at 4–5 weeks did not separate from placebo. Commit to at least 8 weeks before judging. Shankhpushpi has no trial-defined timeline, so there's no honest comparison to make — don't trust a product that gives shankhpushpi a precise onset week.

Dosage Comparison

Safety Comparison

Ashwagandha — more data, more documented cautions:

• Case reports of liver injury (rare) — NCCIH notes "a number of cases that link liver injury to ashwagandha supplements"; Björnsson et al. 2020 published a case series (PMID 31991029). Thyroid hormone increases reported (Sharma et al. 2018 RCT: TSH −17.4%, T4 +19.6%, T3 +41.5%) — NCCIH does not recommend use in people with thyroid disorders, and it may interact with thyroid hormone medications.
• May potentiate sedatives — NCCIH lists sedatives among documented interactions; trial adverse events included drowsiness.
• Avoid in pregnancy — NCCIH advises against use in pregnancy and while breastfeeding; long-term safety data are lacking.
• Autoimmune conditions: NCCIH does not recommend use — possible immune stimulation.

Shankhpushpi — favorable animal toxicology, thinner human data:

• C. pluricaulis: no mortality in animal toxicology up to 5,000 mg/kg; E. alsinoides: no mortality or organ toxicity up to 2,000 mg/kg in acute and 28-day subacute studies (Siripurapu et al. 2005).
• Thyroid caution from Panda & Kar 2001 — root extract inhibited T3 production in levothyroxine-treated female mice (animal study; not a human safety signal).
• No human case reports of liver/kidney injury identified.
• Excessive intake above ~12 g/day flagged on precautionary grounds by the site's own shankhpushpi guide (excessive sedation, blood-pressure drop, GI upset, possible thyroid interference with medications).

Bottom line on safety: ashwagandha's cautions are better documented because it's better studied; shankhpushpi's profile looks clean but rests on thinner human evidence. Both warrant prescriber input if you take thyroid medication, sedatives, or are pregnant.

How to Choose

• Anxiety/stress as the primary goal → ashwagandha. It has the RCTs, the validated scales, and the cortisol data. This is the evidence-based pick.
• Gentle traditional calming use, mild mental fatigue, and you're comfortable with tradition-grade evidence → shankhpushpi (species-identified product: Convolvulus pluricaulis).
• Sleep-focused anxiety → ashwagandha (Langade 2019 insomnia/anxiety trial).
• Combining: no placebo-controlled trials have tested ashwagandha + shankhpushpi together; the combination appears in traditional polyherbal formulas and commercial products but is unstudied as an anxiety pairing. Both can cause drowsiness — introduce separately and don't drive drowsy.

📢 Disclaimer: This information is for educational purposes only and is not medical advice. Always consult a qualified healthcare professional before starting any new supplement. Sources are linked for verification.

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