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GABA 500 mg Unflavored

Nutricost
4.7
★ ★ ★ ★ ★
(442 ratings)
GABA 500 mg
Product Image
Score83
A focused standard GABA product delivering 500 mg in a bulk unflavored powder. Accurate measurement depends on the included scoop and careful technique.
How scoring works
Quantity:500 Gram(s) • (1000 servings)
Goals:
Stress Relief
Sleep Support

Score 83

A focused standard GABA product delivering 500 mg in a bulk unflavored powder. Accurate measurement depends on the included scoop and careful technique.
How scoring works
$21.95($0.02 per serving)
iHerb
$ 21.95
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Analysis

The bulk unflavored powder supplies 500 mg of standard GABA. The formula also has flexible servings without additional listed actives.

The adjustable format makes it easier to use less or more than a fixed capsule serving. Standard oral GABA may support relaxation for some users, but its effects are variable and should not be treated as a guaranteed sleep aid.

The main limitation is that accurate measurement depends on the included scoop and careful technique. The product fits adults comfortable measuring bulk powder, provided sedative stacking and next-day drowsiness are considered.

Who is it for
  • adults comfortable measuring bulk powder
  • people seeking focused relaxation support without a multi-herb blend
Best for
  • evening relaxation
  • supporting a calmer bedtime routine

Pros

  • Clearly states 500 mg of GABA
  • Adjustable format supports flexible serving size
  • Flexible servings without additional listed actives

Cons

  • Accurate measurement depends on the included scoop and careful technique
  • Oral GABA effects may differ substantially between users
  • Focused formula does not address broader causes of poor sleep or stress

Warnings

  • Measure the bulk powder with the supplied scoop; a heaped or substituted scoop can materially change the serving.
  • GABA may cause drowsiness, dizziness, or reduced alertness.
  • Alcohol, sleep medicines, benzodiazepines, antihistamines, or other sedatives may intensify drowsiness when combined with GABA.

Nutrient quality

87 Highest impact

Powder delivery is flexible, but the generic GABA source lacks fermentation details. The GABA amount provides substantial standalone depth, and the single active directly targets relaxation but covers only one pathway.

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Ingredient transparency

78 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

70 High impact

The supplied aggregate satisfaction level is strong. The moderate feedback volume offers a useful but not definitive aggregate.

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Value for money

99 Highest impact

The large supply and flexible delivery strongly support the low cost. The serving is exceptionally economical, and the product is highly competitive for bulk GABA use.

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Goals

Stress Relief
Stress Relief
Impact
High effect
B- Goal FitA- Strength of SupportC CoverageA Formula Quality
GABA · 500 mg

GABA has a direct calming rationale as the body's main inhibitory neurotransmitter, and the powder provides a meaningful amount. Oral GABA's ability to reach the brain remains uncertain, so individual effects may vary.

The unflavored single-ingredient powder is transparent and flexible to measure, but it lacks a branded fermented source. The formula offers focused depth for one calming pathway without broader stress-resilience support.

Study evidence
GABA Supportive 6 studies
Sleep Support
Sleep Support
Impact
High effect
D+ Goal FitA Strength of SupportC- CoverageA Formula Quality

GABA at 500 mg supplies a clearly disclosed amount aimed at nervous-system relaxation. Oral GABA has uncertain entry into the brain, so evidence for improving sleep remains limited.

The powder keeps the formula simple and gives one pathway meaningful depth. Circadian timing, mineral support, and other sleep mechanisms are not addressed.

Study evidence
GABA Supportive 4 studies

Ingredients

IngredientAmount per serving
GABA
500 mg
Gluten Free Adults 18–50
Report overview
GABA · 500 mg OverallScore93
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The powder supplies a clearly disclosed standalone amount within the preferred range. Powder delivery is flexible and may support rapid mixing, though the GABA source is not a branded fermented form. The very low serving cost provides strong value.

View ingredientView products
Loading alternative details
74 Performance

Liposomal GABA

Quicksilver Scientific
<p>240 mg GABA with 100 mg L-theanine and phosphatidylcholine broadens the original's single-ingredient approach and may better support relaxation through complementary pathways. The supplied data do not establish how much the liposomal delivery changes absorption, and the serving cost is high.</p>
85 Performance

Pharma GABA 250 mg

Natural Factors Stress-Relax
<p>250 mg fermented branded GABA provides clearer source definition than the original's generic GABA. The branded source improves ingredient definition, although oral GABA effects can vary and drowsiness remains possible.</p>
84 Performance

GABA 500 mg

NOW
<p>500 mg GABA with 2 mg vitamin B6 adds a small relevant vitamin cofactor while retaining the original's GABA amount. Generic sourcing and uncertain oral brain availability limit confidence, and drowsiness remains possible.</p>
84 Budget

GABA

NOW
<p>The eligible pool does not provide three lower-cost choices, so 500 mg GABA is a near-cost fallback rather than a true saving. Generic sourcing and uncertain oral brain availability limit confidence, and drowsiness remains possible.</p>
81 Budget

GABA 750 mg

Source Naturals Serene Science
<p>The eligible pool does not provide three lower-cost choices, so 750 mg GABA is a near-cost fallback rather than a true saving. Generic sourcing and uncertain oral brain availability limit confidence, while the high amount may increase drowsiness.</p>
83 Budget

GABA 500 mg

Nutricost
<p>The eligible pool does not provide three lower-cost choices, so 500 mg GABA with 2 mg vitamin B6 is a near-cost fallback rather than a true saving. Generic sourcing and uncertain oral brain availability limit confidence, and drowsiness remains possible.</p>
83 Value

GABA 500 mg

NOW
<p>500 mg GABA with 2 mg vitamin B6 offers a practical formula-and-cost balance, although it is not cheaper than the unusually economical original. Generic sourcing and uncertain oral brain availability limit confidence, and drowsiness remains possible.</p>
83 Value

GABA 500 mg

Swanson
<p>500 mg GABA offers a practical formula-and-cost balance, although it is not cheaper than the unusually economical original. Generic sourcing and uncertain oral brain availability limit confidence, and drowsiness remains possible.</p>
81 Value

GABA Powder

Source Naturals Serene Science
<p>750 mg GABA offers a practical formula-and-cost balance, although it is not cheaper than the unusually economical original. Generic sourcing and uncertain oral brain availability limit confidence, while the high amount may increase drowsiness.</p>
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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 forGABA
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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