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Head-to-head evidence comparison — which supplement is right for you?
GABA vs Kava: Kava has the stronger overall evidence (6 vs 4/10); they're alternatives for reduce anxiety & stress — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Kava wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Probably helps
3 of 6 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both GABA and Kava have evidence — compare verdict strength side-by-side.
250-300 mg (the one cited trial that states its dose used 300 mg a day). Label ranges go up to 750 mg, above that dose.
30-60 minutes before desired effect, Before bed for sleep, Before stressful events for anxiety
Capsules or powder
150-300mg kavalactones daily. The cited trials used 120 to 250 mg of kavalactones a day.
Evening for relaxation, 30-60 minutes before stressful events, Before bed for sleep
Water-extracted root powder or capsules
and 6 more not shown
Excessive sedation and CNS depression
Avoid combining due to additive CNS depression.
30-60 minutes
30-60 minutes
30-60 minutes
30-60 minutes
30-60 minutes
30-60 minutes
1-2 hours
Herbal Remedies and Their Possible Effect on the GABAergic System and Sleep
Nutrients (2021) · Systematic review
A systematic analysis of studies on how various herbal medicines act on GABA receptor subtypes in the context of sleep. It reviews mechanisms, not trials of GABA supplements.
Effect of Probiotics on the Symptomatology of Autism Spectrum Disorder and/or Attention Deficit/Hyperactivity Disorder in Children and Adolescents: Pilot Study
Research on child and adolescent psychopathology (2025) · Rct · n=80
80 children aged 5 to 16 with ADHD (38) or autism (42) took a probiotic (Lactiplantibacillus plantarum and Levilactobacillus brevis, strains linked to dopamine and GABA production) or placebo for 12 weeks. No GABA was given.
GABA Supplementation, Increased Heart-Rate Variability, Emotional Response, Sleep Efficiency and Reduced Depression in Sedentary Overweight Women Undergoing Physical Exercise: Placebo-Controlled, Randomized Clinical Trial
Journal of dietary supplements (2024) · Rct · n=30
30 sedentary women with overweight or obesity doing physical exercise took GABA 200 mg or placebo once daily for 90 days.
Herbal medicines in the treatment of psychiatric disorders: 10-year updated review
Phytotherapy research : PTR (2018) · Systematic review
Other encouraging herbal medicines with preliminary evidence include Curcuma longa (turmeric) in depression, Withania somnifera (ashwagandha) in affective disorders, and Ginkgo biloba (ginkgo) as an adjunctive treatment in Schizophrenia.
GABA-modulating phytomedicines for anxiety: A systematic review of preclinical and clinical evidence
Phytotherapy research : PTR (2018) · Systematic review
An open-ended search to 5 July 2017 was conducted using MEDLINE (PubMed), Scopus, and Cochrane library online databases and performed in a stepped format from preclinical to clinical investigations.
Herbal medicine for insomnia: A systematic review and meta-analysis
Sleep medicine reviews (2015) · Meta analysis · n=1602
There was no statistically significant difference between any herbal medicine and placebo, or any herbal medicine and active control, for any of the thirteen measures of clinical efficacy.
Kava has a higher evidence score (6/10 vs 4/10) and wins in 2 of 3 categories.
For reduce anxiety & stress, Kava has a higher relevance score (90 vs 75).
Excessive sedation and CNS depression Avoid combining due to additive CNS depression. Consult a healthcare provider for personalized advice.
Ashwagandha, L-theanine, magnesium, saffron — what actually helps stress, and the safety caveats.
Melatonin, magnesium, glycine, L-theanine — tiered by evidence, plus a wind-down timeline.
What’s safe while nursing, the truth about milk-supply herbs, and what to avoid (it passes into milk).
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.