Supplement encyclopedia

Avena sativa

Name: Avena sativa
Creator: Pillintrip Editorial Team

Written by Pillintrip Editorial Team Updated October 30, 2026

Oats (Avena sativa) are used as a food grain, a source of β-glucan and raw material for green herb extracts. These products differ.

Recheck the conclusions and examine the sources before choosing a supplement.

Main conclusion

Potential benefits

Oatmeal can make breakfast more filling. Green oat extract is a different product: in individual trials it changed performance on attention and working-memory tasks. A food effect cannot be applied to every capsule. [1] [2]

What was studied

Satiety after breakfast: Two test breakfasts; assessment over four hours and the following lunch; Attention and working memory: 29 days. [1] [2]

How to obtain it from food

Effects and studied questions

Goal or question	Result	Confidence	Studies	Population studied	Key sources
Satiety after breakfast	Ordinary oatmeal has direct evidence for a more filling breakfast; this does not establish an effect of a weight-loss capsule.After oatmeal, subjective satiety was higher and the next lunch contained fewer calories than after dry oat breakfast cereal. Body weight over months was not assessed in this experiment.	3/5	1One direct trial described; the count refers to the named publication, not the entire literature.Instant Oatmeal Increases Satiety and Reduces Energy Intake Compared to a Ready-to-Eat Oat-Based Breakfast Cereal: A Randomized Crossover Trial ↗	48 healthy adults	Instant Oatmeal Increases Satiety and Reduces Energy Intake Compared to a Ready-to-Eat Oat-Based Breakfast Cereal: A Randomized Crossover Trial ↗
Attention and working memory	A specific extract may have a small effect on task performance; ordinary oatmeal is not equivalent.Positive results on individual working-memory and simultaneous-processing tasks were obtained at 430 and 1290 mg. There was no convincing mood improvement and no linear dose-response relationship.	2/5	1One direct trial described; the count refers to the named publication, not the entire literature.Acute and Chronic Effects of Green Oat (Avena sativa) Extract on Cognitive Function and Mood during a Laboratory Stressor in Healthy Adults: A Randomised, Double-Blind, Placebo-Controlled Study in Healthy Humans ↗	132 healthy adults aged 35–65; 126 in the day-29 analysis	Acute and Chronic Effects of Green Oat (Avena sativa) Extract on Cognitive Function and Mood during a Laboratory Stressor in Healthy Adults: A Randomised, Double-Blind, Placebo-Controlled Study in Healthy Humans ↗

The study count refers to the cited source. Reviews with overlapping trials and outcomes from one study are not added together.

Guidance for each goal

Satiety after breakfast

Confidence3/5

Ordinary oatmeal has direct evidence for a more filling breakfast; this does not establish an effect of a weight-loss capsule.

Study findings. After oatmeal, subjective satiety was higher and the next lunch contained fewer calories than after dry oat breakfast cereal. Body weight over months was not assessed in this experiment.

Studied regimen66.8 g of dry flakes with 360 g of water and 307 g of milk; breakfast 363 kcalPrepared oatmeal

Duration and populationTwo test breakfasts; assessment over four hours and the following lunch48 healthy adults

The confidence scale assesses the reliability of this conclusion, not the probability of an individual result.

Attention and working memory

Confidence2/5

A specific extract may have a small effect on task performance; ordinary oatmeal is not equivalent.

Study findings. Positive results on individual working-memory and simultaneous-processing tasks were obtained at 430 and 1290 mg. There was no convincing mood improvement and no linear dose-response relationship.

Studied regimen430, 860 or 1290 mg of finished product/day, corresponding to 300, 600 or 900 mg of native extractGreen oat extract with a defined specification

Duration and population29 days132 healthy adults aged 35–65; 126 in the day-29 analysis

The confidence scale assesses the reliability of this conclusion, not the probability of an individual result.

How to read the confidence scale 1–5

The rating considers study quality, directness and applicability to the stated group and regimen. It is an editorial scale, not the probability of an individual result.

Safety and limitations

Grain, bran, β-glucan and green herb differ. Digestive complaints may occur. In celiac disease, absence of gluten contamination and individual tolerability matter: some people may react to avenin even in pure oats. In celiac disease, choose oats with controlled gluten contamination; even pure oats may cause an individual reaction to avenin. Increase β-glucan amounts according to dietary fiber tolerability.

Acute and Chronic Effects of Green Oat (Avena sativa) Extract on Cognitive Function and Mood during a Laboratory Stressor in Healthy Adults: A Randomised, Double-Blind, Placebo-Controlled Study in Healthy Humans ↗ · The separate effects of whole oats and isolated beta-glucan on lipid profile: A systematic review and meta-analysis of randomized controlled trials ↗ · Oat beta-glucans and reduction of postprandial glucose peak: Evaluation of a health claim pursuant to Article 13(5) of Regulation (EC) No 1924/2006 ↗

Forms

Grain, flakes, bran: Foods with differing fiber contents and water proportions. Oat β-glucan: The amount of the fiber itself, solubility, viscosity and food matrix matter for the result. Green herb extract: Not equivalent to grain or β-glucan; studied doses are tied to the extract specification.

Food sources

Food forms of oats include grain, flakes, bran, porridge and foods with added oats. A 40 g portion of dry flakes contains about 152 kcal, and 20 g of dry bran 49 kcal. For comparison with LDL studies, check the amount of β-glucan: flake or bread weight is not the weight of this fiber. For LDL effects, the study reference is the amount of oat β-glucan, not calories or total product weight. Obtain β-glucan content from the specification/label; do not calculate it from total fiber. In bread and baked products, the oat proportion and sugar depend on the recipe. Green extract is a separate form.

Food	Group	Amount	Serving	Calories	Sources
Oat graindry	Oat food forms	—	40 g · 155.6 kcal	389 kcal / 100 g	USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗
Oat flakesdry, unfortified	Oat food forms	—	40 g · 151.6 kcal	379 kcal / 100 g	USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗
Oat brandry	Oat food forms	—	20 g · 49.2 kcal	246 kcal / 100 g	USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗
Oat bran porridgecooked	Oat food forms	—	150 g · 60 kcal	40 kcal / 100 g	USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗
Oat bran breadfinished bread	Oat food forms	—	30 g · 70.8 kcal	236 kcal / 100 g	USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗
Oat bran muffinfinished baked product	Oat food forms	—	50 g · 135 kcal	270 kcal / 100 g	USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗

USDA National Nutrient Database for Standard Reference, Release 28 (SR28): ASCII data and documentation ↗

Studies

Publication	What was studied	Participants	Form and dose	Result
Instant Oatmeal Increases Satiety and Reduces Energy Intake Compared to a Ready-to-Eat Oat-Based Breakfast Cereal: A Randomized Crossover Trial ↗	Satiety after breakfast	48 healthy adults	Prepared oatmeal: 66.8 g of dry flakes with 360 g of water and 307 g of milk; breakfast 363 kcal. Two test breakfasts; assessment over four hours and the following lunch	After oatmeal, subjective satiety was higher and the next lunch contained fewer calories than after dry oat breakfast cereal. Body weight over months was not assessed in this experiment.
Acute and Chronic Effects of Green Oat (Avena sativa) Extract on Cognitive Function and Mood during a Laboratory Stressor in Healthy Adults: A Randomised, Double-Blind, Placebo-Controlled Study in Healthy Humans ↗	Attention and working memory	132 healthy adults aged 35–65; 126 in the day-29 analysis	Green oat extract with a defined specification: 430, 860 or 1290 mg of finished product/day, corresponding to 300, 600 or 900 mg of native extract. 29 days	Positive results on individual working-memory and simultaneous-processing tasks were obtained at 430 and 1290 mg. There was no convincing mood improvement and no linear dose-response relationship.