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NOW Foods vs Life Extension GABA (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
NOW Foods edges it on our rubric, 87 to 86 on our 0-100 execution score. Dosing and form ties at a full 25 for both, since each lands inside the studied synthetic range. Life Extension wins purity verification 20 to 19 and transparency 22 to 20; NOW wins value 23 to 19 at half the daily cost. Neither one holds a badge in our GABA scorecard: our Top Pick sits with a PharmaGABA product and our Best Value with a different NOW SKU. In our view the one-point margin is the correct read. These are near-identical synthetic GABA capsules from credible brands, and the deciding factor is price, where NOW is half.
The added B6 is a mild point in NOW's favor and our own notes say it is not proven to improve outcomes, so we would not pay extra for it. The larger judgment our rubric cannot make: our profile says L-theanine and magnesium glycinate have stronger evidence for the same goals, and that long-term safety beyond 8 to 12 weeks is unknown. It also says to skip GABA entirely if you take benzodiazepines, gabapentin, or other GABAergic drugs, which is worth checking with your clinician.
NOW Foods GABA 500mg
NOW Foods
Life Extension GABA 750mg
Life Extension
Head-to-Head Comparison
| Category | NOW Foods GABA 500mg NOW Foods | Life Extension GABA 750mg Life Extension |
|---|---|---|
| Brand Score | 87/100Winner | 86/100 |
| Dosing & Form | 25/25Winner | 25/25 |
| Purity | 19/25 | 20/25Winner |
| Value | 23/25Winner | 19/25 |
| Transparency | 20/25 | 22/25Winner |
| Cost/Day | $0.06Winner | $0.12 |
| Dose/Serving | 500mg | 750mg |
| Form | synthetic gamma-aminobutyric acid capsule with vitamin B6 | synthetic gamma-aminobutyric acid vegetarian capsule |
| Third-Party Tested | ✓ Yes | ✓ Yes |
| Proprietary Blend | No | No |
Why This Comparison Matters
Both of these are synthetic gamma-aminobutyric acid capsules from established brands, one point apart on our rubric, and both inherit the same problem. Our profile grades GABA at evidence tier 4, says oral GABA likely does not cross the blood-brain barrier, and notes that the entire category rests on a single 13-person PharmaGABA EEG study.
NOW is 500mg per capsule with 2mg of vitamin B6 added as a cofactor for GABA synthesis, which our notes call a logical if unproven inclusion, at 200 capsules for $11.99 from an NPA GMP audited facility. Life Extension is 750mg per capsule in a vegetarian capsule at 90 capsules for $10.88, with third-party testing certificates available on request. Neither carries USP or NSF certification, and neither is PharmaGABA, the fermented form behind most of what evidence exists.
On cost, NOW is about $0.06 a day and Life Extension about $0.12. Our profile's stated range is 100 to 750mg daily, with most studies using 100 to 200mg of PharmaGABA or 250 to 750mg of synthetic GABA, so both doses sit inside it.
Detailed Score Breakdown
NOW Foods GABA 500mg
NOW Foods
Synthetic GABA at 500mg - moderate dose. Closer to the range used in the Byun 2018 sleep study (300mg), though still synthetic rather than fermented.
NPA GMP audited facility. No major third-party certification on this SKU. NOW Foods has a track record of passing ConsumerLab tests in other categories.
$0.06/day - excellent value. The 200-count bottle lasts over 6 months.
Clean label. Synthetic GABA clearly stated. B6 (2mg) added as a cofactor for GABA synthesis, which is a reasonable inclusion. No proprietary blends.
Includes 2mg vitamin B6 as a cofactor. B6 is involved in GABA synthesis in the body, which is a logical (if unproven) addition.
Life Extension GABA 750mg
Life Extension
Synthetic GABA at 750mg. Same evidence limitations as all synthetic GABA products - the BBB question is unresolved.
Life Extension uses third-party testing (certificates available on request). GMP facility. No USP/NSF certification on this product.
$0.12/day - moderate pricing. More expensive than NOW Foods for an equivalent product.
Full ingredient disclosure. No proprietary blends. Life Extension provides detailed product information and references on their website.
Life Extension funds independent longevity research. Their GABA product is a basic synthetic formulation that costs more than NOW Foods for the same ingredient.
How We Compared These Products
Every product in our database is scored on four equally-weighted pillars: dosing accuracy and form quality, purity verification (third-party testing), cost per clinically effective dose (not cost per pill), and label transparency. Each pillar is worth 25 points for a total of 100.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
Frequently Asked Questions
Does oral GABA actually work?
Our profile is skeptical. It grades GABA at evidence tier 4, says oral GABA likely does not cross the blood-brain barrier, and notes the entire category rests on a single 13-person PharmaGABA EEG study. It points to L-theanine and magnesium glycinate as having stronger evidence for the same goals. That applies to both products here equally, since neither is PharmaGABA.
Which GABA supplement is cheaper per day?
NOW Foods, at about $0.06 a day against Life Extension at about $0.12. The bottles are $11.99 for 200 capsules and $10.88 for 90. Our value pillar scores that 23 to 19, and it is the only pillar with a meaningful gap between the two.
Is PharmaGABA better than synthetic GABA?
Our profile lists PharmaGABA, the naturally fermented form, first among best forms, and notes that most of what evidence exists used 100 to 200mg of PharmaGABA rather than synthetic GABA. Neither product in this comparison is PharmaGABA; both are synthetic at 500mg and 750mg, which our profile's 250 to 750mg synthetic range covers. Our Top Pick badge in this category sits with a PharmaGABA product from a different brand.
More GABA (Gamma-Aminobutyric Acid) Comparisons
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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.