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Wheatgrass (Triticum aestivum)
The young grass of the common wheat plant, juiced or powdered as a chlorophyll- and nutrient-rich 'green' tonic. A few small clinical trials hint at benefits — reduced disease activity in distal ulcerative colitis and lower transfusion needs in some thalassemia patients — but every trial is small and methodologically limited, and most other claims rest on in-vitro and animal work.
What the evidence says
Most Wheatgrass studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from mixed-quality randomised trials published 2002–2026 with a typical study size of 23 participants.
Based on 4 studies · 1 RCT · 39 total participants
Confidence
LowBy outcome
Wheatgrass has an evidence score of 2.5/10 — emerging evidence based on 4 indexed studies. The young grass of the common wheat plant, juiced or powdered as a chlorophyll- and nutrient-rich 'green' tonic. A few small clinical trials hint at benefits — reduced disease activity in distal ulcerative colitis and lower transfusion needs in some thalassemia patients — but every trial is small and methodologically limited, and most other claims rest on in-vitro and animal work. Representative study: PMID 11989836.
The commonly studied dose of Wheatgrass is About 100ml of fresh wheatgrass juice daily (dose used in the UC and thalassemia trials); powders ~3-5g. 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.
Wheatgrass is the young, grass-stage shoots of Triticum aestivum, harvested before the plant forms grain and consumed as fresh juice, frozen juice, tablets or powder. Its marketing leans on a rich content of chlorophyll, flavonoids, and vitamins C and E, with broad 'detox' and 'energy' claims. The honest evidence picture: there are a handful of small human trials with intriguing but preliminary signals — a randomized double-blind placebo-controlled trial in active distal ulcerative colitis (23 patients) found reduced disease activity and rectal bleeding, and a pilot study in transfusion-dependent beta-thalassemia found roughly half of patients needed less blood. Beyond these, most evidence is in-vitro (often using the distinct fermented wheat germ extract) or animal work on antioxidant, anti-cancer-adjuvant and gastroprotective effects. Reviews of the field consistently conclude that the trials are small, have methodological problems, and that benefits need confirmation in larger studies before any clinical recommendation. So wheatgrass sits firmly in 'emerging, plausible-but-unproven' territory.
Rich in chlorophyll, flavonoids and vitamins C/E, with antioxidant activity shown in lab assays.
Preclinical work links wheatgrass flavonoids (e.g. schaftoside) to mucin-protective pathways in cell and animal models.
How Wheatgrass 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.
About 100ml of fresh wheatgrass juice daily (dose used in the UC and thalassemia trials); powders ~3-5g
Can be taken without food
| Form | Type |
|---|---|
| 💊Fresh wheatgrass juice | Recommended |
| 💊Frozen wheatgrass juice | Alternative |
| 🧪Wheatgrass powder | Alternative |
| 💊Wheatgrass tablets | Alternative |
Note that fermented wheat germ extract studied for cancer adjuvant use is a different product from wheatgrass juice.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Traditionally taken as juice on an empty stomach.
Dose-response data unavailable. The current published research for Wheatgrass 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.
Lower disease activity and rectal bleeding in one small distal-UC RCT.
Broad 'detox/energy' claims are not supported by human trials.
Use caution — verify the product is certified gluten-free, as seed/grain cross-contamination is possible.
Not studied; raw juice also carries a contamination risk — avoid raw forms in pregnancy.
No clinically significant drug interactions are well documented; data are limited.
Tip: Start with a small amount; dilute the juice
Both are chlorophyll-rich 'green' supplements marketed for detox and antioxidant support.
Layered chlorophyll and micronutrient intake (each modestly evidenced).
Commonly combined in 'green' blends as nutrient-dense additions.
Broad antioxidant and micronutrient intake.
The best time to take Wheatgrass is in the morning. It can be taken on an empty stomach. Traditionally taken on an empty stomach as juice; trials used ~100ml/day.
Wheatgrass is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are nausea, headache, or unpleasant taste (tolerability). Use caution if any of these apply to you: Wheat or grass allergy; Celiac disease / gluten sensitivity (grass is harvested pre-grain but cross-contamination with seed is possible).
Reduces cold risk and shortens infection duration — most effective when started at first sign of symptoms.
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