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Maximum-Strength GABA 750 mg

Swanson Ultra
4.7
★ ★ ★ ★ ★
(2979 ratings)
GABA 750 mg
Product Image
Score82
A focused standard GABA product delivering 750 mg in a single capsule. The high amount may be more sedating and the source is not verified.
How scoring works
Quantity:60 Capsule(s) • (60 servings)
Goals:
Sleep Support
Stress Relief
Mood Support

Score 82

A focused standard GABA product delivering 750 mg in a single capsule. The high amount may be more sedating and the source is not verified.
How scoring works
$11.09($0.18 per serving)
Walmart
$ 11.09
Amazon
$ 11.09
iHerb
$ 11.29
iHerb
$ 11.29
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Analysis

The single capsule supplies 750 mg of standard GABA. The formula also has a focused maximum-strength formula.

The upper-range amount may suit people who already know they respond to GABA. It is less appropriate as a first trial because stronger drowsiness can make daytime use or dose adjustment difficult.

The main limitation is that the high amount may be more sedating and the source is not verified. The product fits experienced users seeking an upper-range capsule, provided sedative stacking and next-day drowsiness are considered.

Who is it for
  • experienced users seeking an upper-range capsule
  • people seeking focused relaxation support without a multi-herb blend
Best for
  • evening relaxation
  • supporting a calmer bedtime routine

Pros

  • Clearly states 750 mg of GABA
  • Single capsule is easy to use
  • A focused maximum-strength formula

Cons

  • The high amount may be more sedating and the source is not verified
  • Higher fixed amount offers limited titration flexibility
  • Focused formula does not address broader causes of poor sleep or stress

Warnings

  • GABA may cause drowsiness, dizziness, or reduced alertness.
  • Alcohol, sleep medicines, benzodiazepines, antihistamines, or other sedatives may intensify drowsiness when combined with GABA.
  • Avoid driving or operating machinery until the response to the 750 mg amount is known.

Nutrient quality

82 Highest impact

The vegetable capsule is practical, but the generic GABA source lacks fermentation details. The GABA amount reaches the high end of the common standalone range, and the high single-active dose provides depth within one calming pathway.

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Ingredient transparency

79 High impact

Every listed active has a specific amount and no proprietary blend obscures the formula. Complete intake directions and inactive ingredients are not supplied, leaving part of the label unverified.

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Customer satisfaction

73 High impact

The supplied aggregate satisfaction level is strong. The extensive feedback volume makes the aggregate dependable.

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Value for money

95 Highest impact

The high dose strongly supports the modest cost. The serving offers excellent value, and the product compares favorably among high-dose GABA capsules.

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Goals

Sleep Support
Impact
High effect
C+ Goal FitA Strength of SupportC CoverageA+ Formula Quality

A substantial GABA amount is intended to promote nervous-system relaxation before bed. The single-active formula is focused and fully disclosed.

Human sleep evidence is limited because oral GABA does not reliably reach the brain in meaningful amounts. GABA may add to drowsiness from alcohol, sedatives, or other sleep medicines.

Study evidence
GABA Supportive 4 studies
Stress Relief
Impact
High effect
B- Goal FitA- Strength of SupportC- CoverageA+ Formula Quality
GABA · 750 mg

GABA provides a direct calming rationale through inhibitory signaling, and the 750 mg amount is substantial. Oral GABA evidence is still limited because delivery to the brain is uncertain.

The focused formula provides strong depth for acute relaxation but does not address adaptogenic or foundational nutrient pathways. Its exact active amount is clear, though no branded fermented source is identified.

Study evidence
GABA Supportive 6 studies
Mood Support
Impact
High effect
D Goal FitB+ Strength of SupportD CoverageA+ Formula Quality

Oral GABA may promote a calmer state, but its ability to influence persistent mood is uncertain. Evidence is limited by uncertain brain entry and does not establish a dependable mood-stabilizing effect.

The 750 mg amount is clearly disclosed and fits standalone calming use. GABA may add to drowsiness from alcohol, sleep aids, or other sedating medicines.

Study evidence
GABA Supportive 12 studies

Ingredients

IngredientAmount per serving
GABA
750 mg
Adults 18–50 Vegetarian
Report overview
GABA · 750 mg OverallScore84
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB- Value

The clearly disclosed GABA amount reaches the upper end of the preferred standalone range. A vegetable capsule provides practical delivery, but the unbranded source lacks the quality signal of fermented PharmaGABA. Cost per effective serving is favorable.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Oral intake of γ-aminobutyric acid affects mood and activities of central nervous system during stressed condition induced by mental tasks.
    Yoto A; Murao S; Motoki M; Yokoyama Y; Horie N; Takeshima K; Masuda K; Kim M; Yokogoshi H · Amino acids · 2012
    Randomized trial63 participantsStress Relief Mood Support forGABA
  2. Peripartum neuroactive steroid and γ-aminobutyric acid profiles in women at-risk for postpartum depression.
    Deligiannidis KM; Kroll-Desrosiers AR; Mo S; Nguyen HP; Svenson A; Jaitly N; Hall JE; Barton BA; Rothschild AJ; Shaffer SA · Psychoneuroendocrinology · 2017
    Cohort study56 participantsMood Support forGABA
  3. The role of neurotransmitters in mediating the relationship between brain alterations and depressive symptoms in patients with inflammatory bowel disease.
    Wang J; Liu G; Xu K; Ai K; Huang W; Zhang J · Human brain mapping · 2023
    Case-control study69 participantsMood Support forGABA
  4. Occipital gamma-aminobutyric acid and glutamate-glutamine alterations in major depressive disorder: An mrs study and meta-analysis.
    Truong V; Cheng PZ; Lee HC; Lane TJ; Hsu TY; Duncan NW · Psychiatry research. Neuroimaging · 2021
    Observational studyMood Support forGABA
  5. Systematic review of gamma-aminobutyric-acid inhibitory deficits across the reproductive life cycle.
    Vigod SN; Strasburg K; Daskalakis ZJ; Blumberger DM · Archives of women's mental health · 2014
    Systematic review11 studies pooledMood Support forGABA
  6. Safety and Efficacy of Gamma-Aminobutyric Acid from Fermented Rice Germ in Patients with Insomnia Symptoms: A Randomized, Double-Blind Trial.
    Byun JI; Shin YY; Chung SE; Shin WC · Journal of clinical neurology (Seoul, Korea) · 2020
    Randomized trial40 participantsSleep Support forGABA
  7. Analysis of the Effects of Known Sleep-Support Supplements in Relation to Life Habits, Sleep Conditions, and Sleep Problems.
    Imafuku F; Yamamoto K; Tanaka E; Aoki R; Nishino S · Nutrients · 2023
    Randomized trial160 participantsSleep Support forGABA
  8. Reduced γ-aminobutyric acid in occipital and anterior cingulate cortices in primary insomnia: a link to major depressive disorder?
    Plante DT; Jensen JE; Schoerning L; Winkelman JW · Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2012
    Case-control study40 participantsSleep Support forGABA
  9. 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.
    Guimarães AP; Seidel H; Pires LVM; Trindade CO; Baleeiro RDS; Souza PM; Silva FGDE; Coelho DB; Becker LK; Oliveira EC · Journal of dietary supplements · 2024
    Randomized trial30 participantsSleep Support Stress Relief forGABA
  10. Relieving occupational fatigue by consumption of a beverage containing γ-amino butyric acid.
    Kanehira T; Nakamura Y; Nakamura K; Horie K; Horie N; Furugori K; Sauchi Y; Yokogoshi H · Journal of nutritional science and vitaminology · 2011
    Clinical trial30 participantsStress Relief forGABA
  11. Cortical gamma-aminobutyric acid and glutamate in posttraumatic stress disorder and their relationships to self-reported sleep quality.
    Meyerhoff DJ; Mon A; Metzler T; Neylan TC · Sleep · 2014
    Case-control study45 participantsStress Relief forGABA
  12. Comparison of the effects of two amino acids, Gamma-aminobutyric acid (GABA) and L-theanine, on sedation, anxiety, and cognition in preoperative surgical patients - A randomized controlled study.
    Deshpande SS; Kurdi M; Baiju A; Athira AS; Sarasamma AG; Gangadharan AK · Journal of anaesthesiology, clinical pharmacology · 2025
    Randomized trial168 participantsStress Relief forGABA