Last verified: 17 days ago
Green Oat Extract
Also known as: Wild Green Oat Extract, WGOE, Avena sativa extract, Neuravena, GOE
Evidence under review. — Not yet rated
Green oat extract may support blood vessel function and stress relief, with mixed results for cognition.
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What it does
Green oat extract is a concentrated extract from the unripe Avena sativa plant. Clinical trials show it can meaningfully improve blood vessel flexibility in both systemic and cerebral arteries...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
900-1500 mg daily based on study doses
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Found in
What the Science Says
Green oat extract is a concentrated extract from the unripe Avena sativa plant. Clinical trials show it can meaningfully improve blood vessel flexibility in both systemic and cerebral arteries after 12 weeks of daily use at 1500 mg. It has also shown benefits for stress, sleep quality, and quality of life in adults trying to reduce smoking, at 900 mg/day over 8 weeks.
What It Doesn't Do
Won't reliably sharpen your thinking long-term — a 12-week trial found no lasting cognitive benefit in healthy older adults. Doesn't lower resting blood pressure. Acute mental performance boosts seen in some studies haven't translated into sustained improvements with daily use.
Evidence-Based Benefits
Improves blood vessel flexibility in both the arms and brain after 12 weeks of daily use.
Moderate EvidenceEffective at: 1500 mg/day
Supporting studies (click to view on PubMed):
Reduces perceived stress levels in adults during smoking reduction or cessation.
Moderate EvidenceEffective at: 900 mg/day
Supporting studies (click to view on PubMed):
Improves sleep quality parameters in adults undergoing smoking reduction efforts.
Weak EvidenceEffective at: 900 mg/day
Supporting studies (click to view on PubMed):
Supports smoking reduction — more users cut daily cigarettes by 20%+ compared to placebo.
Weak EvidenceEffective at: 900 mg/day
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — no pharmacokinetic studies were included in the provided data. Oral capsule forms were used in all human trials without absorption data reported.
Red Flags to Watch For
- Most human research uses a single proprietary extract (Neuravena), so results may not apply to other green oat products on the market.
- Cognitive benefits appear to be acute only — chronic daily use did not improve cognition in healthy older adults in a 12-week RCT.
- Animal studies used very high doses that don't directly translate to human dosing guidance.
- Over 1,000 supplement products contain this ingredient, but the clinical evidence base is only 5 trials — most marketing claims outpace the science.
Products Containing Green Oat Extract
See how Green Oat Extract is used in these analyzed products:
Frequently Asked Questions
What does Green Oat Extract do?
Green oat extract may support blood vessel function and stress relief, with mixed results for cognition.
What is the effective dose of Green Oat Extract?
900-1500 mg daily based on study doses
Is Green Oat Extract safe?
Most human research uses a single proprietary extract (Neuravena), so results may not apply to other green oat products on the market.
What doesn't Green Oat Extract do?
Won't reliably sharpen your thinking long-term — a 12-week trial found no lasting cognitive benefit in healthy older adults.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25