Supplement analysis backed by scientific evidence · PT

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Limited evidenceGeneral health

Wheatgrass

Almost every wheatgrass claim — alkalizing the blood, chlorophyll acting like hemoglobin, detoxification — is either biochemically wrong or untested. The only human data worth reading are small uncontrolled thalassemia transfusion studies and one modest, unblinded lipid trial.

What the science says

  • Reducing transfusion need in thalassemia major Limited evidence

    In a pilot study, 16 transfusion-dependent children drank about 100 mL/day of wheatgrass juice and served as their own historical controls against the preceding year. Transfusion requirement fell by more than 25% in 8 of 16, and by more than 40% in 3. With no parallel control group and no blinding, regression to the mean and growth-related changes cannot be excluded — later controlled work has not confirmed the effect.

  • Blood lipids Limited evidence

    A randomized study in 59 hyperlipidemic South Asian women gave 3.5 g/day of freeze-dried wheatgrass powder for 10 weeks: total cholesterol fell 5.4%, LDL 4.4%, and triglycerides 9.5%, with significantly lower baseline-adjusted total cholesterol, triglycerides, and ApoB versus control. But HDL also dropped 6%, and the control group received no intervention at all rather than a placebo.

  • Menopausal symptoms Limited evidence

    The same 10-week trial reported reductions in vasomotor (42%), somatic (33%), and psychological (50%) symptom prevalence — all non-significant, with urogenital symptoms unchanged. This is not a supported use.

Dosage & safety

Studied doseNo established effective dose. Human studies used roughly 100 mL/day of fresh juice (thalassemia) or 3.5 g/day of freeze-dried powder (lipids), for 10 weeks to a year.
SafetyGenerally well tolerated; nausea, headache, and green stool are common in the first days. The real risk is microbiological: wheatgrass is sprouted in warm, humid conditions and fresh juice and sprouts are a recognised vehicle for mold, E. coli, Salmonella, and Listeria — a genuine hazard for immunocompromised, pregnant, or elderly people, who should avoid raw wheatgrass juice. Wheatgrass is harvested before the grain forms and so is normally gluten-free, but cross-contamination during processing does occur; people with celiac disease should use products with verified gluten testing.

Scientific references

Where to buy

Starwest Botanicals, Organic Wheat Grass Powder, 1 lb (453.6 g)

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