Oat Straw Extract
Four small RCTs, all with manufacturer involvement: a 2011 trial (Berry et al.) in elderly people with below-average cognition found a single 1600mg dose reduced Stroop errors, but 2400mg did no better than placebo; a 2012 trial by the same group found 1500mg/day for 12 weeks had no effect on any cognitive measure in healthy older adults (material supplied by Frutarom); a 2015 trial (Kennedy et al., two Frutarom employees as co-authors) found 800mg improved speed, delayed recall and executive function in adults 40–65 with memory complaints, concluding the optimal dose is at or below 800mg; and a 2020 trial (Kennedy et al., two Anklam Extrakt employees as co-authors) found 430–1290mg improved working memory and multitasking over 4 weeks, with no effect on mood.
Evidence reviewed:
Mechanism of action
The human trials we cite tested branded green oat herb extracts (Neuravena in all but one), not oat straw, and the authors of the 12-week cognition trial call the mechanism unknown (Wong 2012). In laboratory assays the Neuravena extract inhibited monoamine oxidase B (MAO-B) and phosphodiesterase-4 (PDE4); no study we found measured cyclic AMP or dopamine signalling in neurons after taking it. Avenanthramides raised nitric oxide production in cultured human aortic smooth-muscle cells, but how much of them the extract contains is not known. In one 12-week crossover trial in 37 healthy adults over 60, 1500mg a day raised cerebrovascular responsiveness by 42% versus placebo (Wong 2013, PubMed 23221935).
Clinical evidence summary
Four small RCTs, all with manufacturer involvement: a 2011 trial (Berry et al.) in elderly people with below-average cognition found a single 1600mg dose reduced Stroop errors, but 2400mg did no better than placebo; a 2012 trial by the same group found 1500mg/day for 12 weeks had no effect on any cognitive measure in healthy older adults (material supplied by Frutarom); a 2015 trial (Kennedy et al., two Frutarom employees as co-authors) found 800mg improved speed, delayed recall and executive function in adults 40–65 with memory complaints, concluding the optimal dose is at or below 800mg; and a 2020 trial (Kennedy et al., two Anklam Extrakt employees as co-authors) found 430–1290mg improved working memory and multitasking over 4 weeks, with no effect on mood.
Human effect matrix
Based on human clinical trials only. Animal and in-vitro data excluded.
| Effect | Evidence | Magnitude | Studies |
|---|---|---|---|
| Attention & Concentration | mixed | Small | 4 |
| Stress Response | preliminary | Small | 1 |
Evidence key: Strong = multiple consistent RCTs · Moderate = smaller/fewer RCTs · Preliminary = early trials or small n · Mixed = conflicting results
Documented benefits
- Acute attention and executive-function gains in small trials
- Working memory and multitasking over 4 weeks (one trial)
Side effects & cautions
- Generally well tolerated — no serious adverse events and no blood-pressure changes in the trials reviewed
- Mild GI discomfort rare
- Oats are often cross-contaminated with gluten during processing — choose a certified gluten-free product if you have celiac disease
How to take
Stacking recommendations
Ingredients that pair well with Oat Straw Extract and why.
Oat Straw is studied for attention; Alpha-GPC is a choline precursor. We cite no trial of the pairing.
L-Tyrosine is a dopamine precursor. We cite no trial of the pairing.
Oat Straw is studied for attention, Bacopa for memory; we cite no trial of the pairing.
Frequently asked questions
Is Oat Straw the same as oatmeal?
No. Oat Straw extract comes from the green, unripe aerial parts of Avena sativa — harvested before the oat grain matures. The active compounds (avenanthramides, saponins) are concentrated in the green straw, not the grain. Eating oatmeal does not provide nootropic effects.
Is a higher dose better?
Not in the trials. In Berry 2011, 1600mg reduced Stroop errors but 2400mg did no better than placebo, and Kennedy 2015 concluded the optimal dose was at or below 800mg. Doses of 430–1290mg worked over 4 weeks in Kennedy 2020.
Does Oat Straw contain gluten?
Oats are technically gluten-free but are commonly cross-contaminated with wheat during processing. If you have celiac disease or severe gluten sensitivity, verify the supplement is certified gluten-free or avoid it entirely.
How does it compare to caffeine for focus?
It is not a stimulant, and no trial has compared the two. The oat extract trials found small attention and working-memory gains without the typical stimulant side effects, but the evidence base is four small, manufacturer-linked trials — far thinner than caffeine's.
Top stacks containing Oat Straw Extract
Oat Straw Extract in Canada
Products in Canada
Health Canada (NPN)
Regulatory note
Natural health products available in Canada are regulated by Health Canada under the Natural Health Products Regulations. Where a product holds an NPN (Natural Product Number), Health Canada says that number "assures consumers that the product has been reviewed and approved by Health Canada for safety and efficacy"; it also states, "To be licensed in Canada, natural health products must be safe, effective, of high quality" (canada.ca, checked 2026-10-08). Cross-border imports without an NPN are not Health Canada licensed. This page is for educational purposes only and is not medical advice. Consult a qualified healthcare professional before starting any supplement.
Sources (5)expand
- PMID 21711204Acute effects of an Avena sativa herb extract on responses to the Stroop Color-Word test (2011)
- PMID 22690320Chronic effects of a wild green oat extract supplementation on cognitive performance in older adults: a randomised, double-blind, placebo-controlled, crossover trial (2012)
- PMID 26618715Acute effects of a wild green-oat (Avena sativa) extract on cognitive function in middle-aged adults: A double-blind, placebo-controlled, within-subjects trial (2015)
- PMID 32485993Acute and Chronic Effects of Green Oat (Avena sativa) Extract on Cognitive Function and Mood during a Laboratory Stressor in Healthy Adults (2020)
- PMID 23221935Chronic consumption of a wild green oat extract (Neuravena) improves brachial flow-mediated dilatation and cerebrovascular responsiveness in older adults (2013)