✓ No active regulatory warningsFDA MedWatch, EMA EudraVigilance, WHO VigiBase, WADA Prohibited List · 2026-05-29
⚠ Cancer patient using wheatgrass as treatment — completely unsubstantiated; ensure proper oncology care [1]
⚠ Celiac patient concerned about wheatgrass gluten — grass is gluten-free; grain is not [1]
⚠ Patient on warfarin — vitamin K content; keep intake consistent [1]
⚠ Patient believing chlorophyll 'detoxifies blood' — myth based on porphyrin structural similarity [1]
ℹ️ Not obtained from food. Not applicable — this is not obtained from food in meaningful amounts; supplementation is the practical route.
🔬 Lab interpreter
ℹ️ No validated blood test. There is no established laboratory test to assess status or guide dosing for this ingredient. Clinical response and symptoms are the practical guide.
⚕ For professionals — confirm ranges against your local laboratory.
Clinical verdict
Wheatgrass is nutritionally equivalent to other dark leafy greens — not a 'superfood.' The only RCT evidence is for UC (1 small trial). Three myths to correct: (1) chlorophyll does NOT oxygenate blood; (2) wheatgrass does NOT treat cancer (Ann Wigmore's unsubstantiated claims); (3) it IS gluten-free when properly harvested. If a patient enjoys wheatgrass shots, fine — but spinning kale offers similar nutrition [1].
1 How much do I need?
👤 Adults: Specific dosage data under clinical review
👴 Elderly: Specific dosage data under clinical review
🤰 Pregnancy: See guidance
Likely safe as food. Home-grown trays may harbor mold; commercial sources preferred [1].
👦 Pediatric: See guidance
Safe as food. Strong taste may be rejected by children [1].
🏃 Athletes: Standard dose
⚖️ Obesity: Standard dose
Fat-soluble compounds may require dose adjustment in obesity.
🩺 Renal: Consult specialist
Dose adjustment may be needed in renal impairment.
🌱 Vegan: Standard dose
How to take
🍽 Timing: Morning, on empty stomach (traditional) [1].
💊 With food: Chase with orange juice or add to smoothie (strong taste) [1].
🚫 Avoid: Expecting 'superfood' benefits beyond standard leafy greens. Using as cancer treatment [1].
2 Which form?
| Form | Bioavailability | Vegan | Cost |
|---|---|---|---|
| ['Fresh wheatgrass juice', 'traditional', '30–60 mL/day. Juiced from live wheatgrass trays. Strong grassy taste [1].'] | Standard | Check label | |
| ['Wheatgrass powder', 'convenient', '3–5 g/day mixed in water or smoothie. Freeze-dried [1].'] | Standard | Check label | |
| ['Wheatgrass tablets', 'convenient', '500 mg × 4–8/day [1].'] | Standard | Check label |
3 Common questions
Is wheatgrass gluten-free? ▼
Yes, when properly harvested. Gluten proteins (gliadin, glutenin) are in the wheat KERNEL (seed), not the grass blade. Wheatgrass harvested before the jointing stage contains no detectable gluten. However, cross-contamination can occur if harvested too late or processed near wheat grain [1].
Does chlorophyll oxygenate the blood? ▼
No. This myth stems from the structural similarity between chlorophyll and hemoglobin (both are porphyrin rings — chlorophyll with magnesium, heme with iron). However, dietary chlorophyll is poorly absorbed, not incorporated into hemoglobin, and does not affect blood oxygen levels. This is one of nutrition's most persistent myths [1].
Is wheatgrass better than eating spinach? ▼
Per gram, wheatgrass and spinach have comparable nutrient profiles. Wheatgrass is not nutritionally superior to other dark leafy greens. The main advantage is convenience (concentrated juice shots), not nutritional superiority [1].
Can wheatgrass treat cancer? ▼
No. This claim originates from Ann Wigmore (1909–1994), who promoted wheatgrass as a cancer cure without scientific evidence. She was twice cited by the Massachusetts Attorney General for making unsubstantiated health claims. There are no clinical trials supporting anti-cancer effects [1].
4 Clinical evidence
Strong
No strong evidence for any indication [1]. HIGH
Moderate
Ulcerative colitis: 1 small RCT (n=23) found 100 mL/day wheatgrass juice × 1 month reduced disease activity (SCCAI) and rectal bleeding vs placebo [1]. Thalassemia: 1 pilot study suggested wheatgrass may reduce transfusion requirements in β-thalassemia major (n=16); needs confirmation [1]. MODERATE
Insufficient
Cancer: Ann Wigmore's claims that wheatgrass treats cancer are completely unsubstantiated [1]. 'Detoxification': chlorophyll does not detoxify blood; it is poorly absorbed from the GI tract [1]. General nutrition: wheatgrass is nutritionally comparable to spinach or kale — not a 'superfood' beyond other greens [1]. Diabetes, weight loss, cholesterol: insufficient data [1]. LOW
5 Safety, toxicity & adverse events
Absolute contraindications
✕ Celiac disease/wheat allergy — cross-contamination with gluten-containing grain is possible (the grass itself is gluten-free but seeds/handling vary)
Relative
⚠ Raw juice — possible bacterial/mold contamination
⚠ Nausea is common when starting
⚠ Pregnancy — use cautiously due to contamination risk
🚩 Red flags
● Cancer patient replacing treatment with wheatgrass [1]
● Home-grown trays with visible mold — discard [1]
6 Interactions
Drug interactions
Warfarin Low
Mechanism: Vitamin K content (like other greens) [1].
Effect: Inconsistent intake may affect INR [1].
Action: Keep intake consistent if on warfarin [1].
Supplement synergies
Spirulina / Chlorella · Standard doses of each
Commonly combined in 'green superfood' formulas [1].
Commonly combined in 'green superfood' formulas [1].
7 Regulatory
United States (FDA): Available as food/juice and dietary supplement. No FDA-approved health claims [1].
8 US supplement products
6
on-market products containing Wheatgrass (NIH DSLD)
Brands carrying Wheatgrass (6)
Click a brand to see its Wheatgrass products.
9 Frequently paired with
10 References (3)
[1]Bar-Sela G, et al. Wheat grass juice in the treatment of active distal ulcerative colitis: a randomized double-blind placebo-controlled trial. Scand J Gastroenterol. 2002;37(4):444-449. doi:10.1080/003655202317316088 RCT Accessed: 2026-05-29
[2]Marawaha RK, et al. Wheat grass juice reduces transfusion requirement in patients with thalassemia major: a pilot study. Indian Pediatr. 2004;41(7):716-720. REVIEW Accessed: 2026-05-29
[3]Chauhan M. A pilot study on wheat grass juice for its phytochemical, nutritional and therapeutic potential on chronic diseases. Int J Chem Stud. 2014;2(4):27-34. REVIEW Accessed: 2026-05-29
11 Related articles
Auto-populated from GMJ Newsroom. Articles tagged "Wheatgrass".
12 Cite this page
Vancouver: Pkhakadze G. Wheatgrass — safety profile [Internet]. Tbilisi: PHIG; 2026 [cited 2026 Jun 01]. Available from: https://supplement.ge/ingredients/wheatgrass/
APA 7th: Pkhakadze, G. (2026). Wheatgrass — Safety profile. Public Health Institute of Georgia. https://supplement.ge/ingredients/wheatgrass/
📋 Editorial information
Author: Prof. G. Pkhakadze, MD, MPH, PhD
Institution: Public Health Institute of Georgia (PHIG)
Affiliation: David Tvildiani Medical University (DTMU)
First published: January 2026
Last reviewed: 2026-05-29
Next review: December 2026
References: 3 cited sources
COI: SupplementIndex receives no funding from supplement manufacturers. All content independently authored by PHIG.
Process: Systematic literature review
📄 License & reuse
Published under Creative Commons Attribution 4.0 International (CC BY 4.0). You may share and adapt for any purpose with attribution.
Pkhakadze G. "Wheatgrass — Safety Profile." SupplementIndex, PHIG, 2026. https://supplement.ge/ingredients/wheatgrass/ CC BY 4.0.
GP
Educational and public health purposes. CC BY 4.0. Consult your healthcare provider before starting any supplement. Corrections: info@accreditation.ge. Publisher: PHIG