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Barley Grass (Hordeum vulgare)
The young leaves of the barley plant, dried or juiced into a chlorophyll- and nutrient-rich 'green' powder. It carries flavonoids (saponarin, lutonarin), antioxidant enzymes and vitamins, and a few small studies hint at antioxidant, lipid and glycemic effects — but the human evidence is sparse and most data are compositional, in-vitro or animal.
What the evidence says
Most Barley Grass studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from mixed-quality studies published 2002–2019 with a typical study size of 36 participants.
Based on 4 studies · 36 total participants
Confidence
Very lowBy outcome
Barley Grass has an evidence score of 2.5/10 — emerging evidence based on 4 indexed studies. The young leaves of the barley plant, dried or juiced into a chlorophyll- and nutrient-rich 'green' powder. It carries flavonoids (saponarin, lutonarin), antioxidant enzymes and vitamins, and a few small studies hint at antioxidant, lipid and glycemic effects — but the human evidence is sparse and most data are compositional, in-vitro or animal. Representative study: PMID 11976562.
The commonly studied dose of Barley Grass is Commonly 3-15g of barley grass powder daily (one clinical trial used 15g of young barley leaf extract). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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Last reviewed June 2026 · evidence from 4 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Barley grass is the young, leafy growth of Hordeum vulgare harvested before grain forms, consumed as juice powder or tablets in 'green superfood' blends. Its bioactive profile is genuinely interesting on paper: flavone glycosides such as saponarin and lutonarin, the antioxidant enzyme superoxide dismutase, GABA, chlorophyll, polyphenols and a range of vitamins and minerals — which underpins antioxidant and metabolic-health marketing. The honest evidence picture is thin. There is one small 4-week clinical study in 36 people with type 2 diabetes showing young barley leaf extract reduced markers of LDL oxidation and free-radical activity (more so when combined with vitamins C and E). Beyond that single human study, the literature is dominated by compositional analyses, in-vitro antioxidant and cancer-cell assays, and animal models (e.g. an anti-obesity / lipid-profile study in high-fat-diet rats). No large randomized trials, no meta-analyses, and no confirmed effect on hard clinical endpoints. So barley grass is best treated as a nutrient-dense green with early, mostly-preclinical metabolic signals rather than a proven supplement.
Contains saponarin, lutonarin, SOD and polyphenols with antioxidant activity in lab and animal models.
Small clinical and animal data suggest reduced LDL oxidation and improved lipid profiles.
How Barley Grass works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
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Commonly 3-15g of barley grass powder daily (one clinical trial used 15g of young barley leaf extract)
Can be taken without food
| Form | Type |
|---|---|
| 🧪Barley grass powder | Recommended |
| 💊Young barley leaf extract | Alternative |
| 💊Barley grass tablets | Alternative |
| 💊Barley grass juice | Alternative |
Distinct from barley grain and from barley beta-glucan supplements.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Commonly taken as a morning green drink.
Dose-response data unavailable. The current published research for Barley Grass does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
Lowered markers of LDL oxidation in one small type 2 diabetes study.
Antioxidant and lipid claims rest largely on in-vitro and animal work.
Use caution — choose a certified gluten-free product, as grain cross-contamination is possible.
Not specifically studied; use normal dietary amounts and prefer well-processed products over raw juice.
No clinically significant drug interactions are well documented; data are limited.
Tip: Start with a low dose and increase gradually
Both are chlorophyll-rich cereal grasses commonly combined in 'green' blends.
Layered chlorophyll, flavonoid and micronutrient intake (each modestly evidenced).
In the diabetes trial, adding vitamins C and E to barley leaf extract enhanced the anti-LDL-oxidation effect.
Greater protection of LDL from oxidation than barley leaf alone.
The best time to take Barley Grass is in the morning. It can be taken on an empty stomach. Often taken as a morning green drink; the one clinical trial used 15g/day of young barley leaf extract.
Barley Grass is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are bloating, gas, or mild GI upset. Use caution if any of these apply to you: Barley or grass allergy; Celiac disease / gluten sensitivity (grass is harvested pre-grain but grain cross-contamination is possible).
Gel-forming soluble fiber that lowers LDL cholesterol, regulates blood sugar, and promotes digestive regularity.