NutriStack
Ashwagandha and GABA, a caution.
Ashwagandha has GABA-mimetic activity, so stacking it with supplemental GABA can produce additive sedation and pronounced drowsiness.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
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At a glance
- Substances
- Ashwagandha and GABA
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Ashwagandha has GABA-mimetic activity, so stacking it with supplemental GABA can produce additive sedation and pronounced drowsiness.
Mechanism. Ashwagandha withanolides act as positive modulators at the GABA-A receptor and show GABA-mimetic activity in preclinical models, so adding exogenous GABA can compound inhibitory neurotransmission and central depression.
Recommendation. Use together cautiously and start with low doses, preferably at night. Avoid combining before driving and be careful if also taking prescription sedatives or sleep medications.
Sources (2)
- Candelario M et al. Direct evidence for GABAergic activity of Withania somnifera on mammalian ionotropic GABAA and GABAρ receptors. J Ethnopharmacol. 2015;171:264-72. PMID 26068424
- Boonstra E et al. Neurotransmitters as food supplements: the effects of GABA on brain and behavior. Front Psychol. 2015;6:1520. PMID 26500584
Stack Score
How this pair moves the number.
Effect on the composite score
If both Ashwagandha and GABA are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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