Wheatgrass is a nutrient-dense young grass from the wheat plant, typically harvested 7 to 10 days after sprouting and consumed as juice, powder, or tablets. It contains a concentrated mix of flavonoids, chlorophyll, vitamins, and minerals that have shown modest but measurable benefits for cholesterol, blood sugar, digestive inflammation, and blood health in early research. Most of these findings come from small studies, so the effects are promising rather than proven at scale.
Cholesterol and Heart Health
The strongest clinical data for wheatgrass involves its effect on blood lipids. In a randomized controlled study of women with high cholesterol, taking 3.5 grams of wheatgrass daily for 10 weeks reduced total cholesterol by 5.4%, LDL (“bad”) cholesterol by 4.4%, and triglycerides by 9.5%. These are modest but meaningful shifts, roughly in line with what you’d see from other dietary interventions like increasing soluble fiber. HDL (“good”) cholesterol did drop by 6% during the study, though researchers noted this reduction wasn’t statistically significant compared to the control group.
The lipid-lowering effect likely comes from wheatgrass’s flavonoid content. The plant is rich in compounds called C-glycosylated flavonoids, with the primary active components being derivatives of apigenin, luteolin, and chrysoeriol. These act as antioxidants that help prevent the oxidation of LDL cholesterol, a key step in the buildup of arterial plaque.
Blood Sugar Effects
Animal research suggests wheatgrass may help with blood sugar regulation. In diabetic rats, wheatgrass treatment reversed the decline in insulin levels and restored the activity of key enzymes the body uses to process glucose. Liver glycogen, the stored form of sugar your body draws on between meals, also returned toward normal levels. These findings point to wheatgrass acting on multiple parts of the sugar metabolism chain rather than a single mechanism. No large human trials have confirmed these results yet, so it’s too early to call wheatgrass a reliable tool for managing blood sugar.
Digestive Inflammation
One area where wheatgrass has been tested directly in people is ulcerative colitis, a form of inflammatory bowel disease. A double-blind, placebo-controlled trial found that wheatgrass juice significantly reduced overall disease activity and the severity of rectal bleeding in patients with active inflammation in the lower colon. The reductions were statistically significant, suggesting a real anti-inflammatory effect rather than a placebo response. This remains a single small trial, but it’s notable because digestive conditions are notoriously hard to treat with dietary supplements alone.
Support During Chemotherapy
Chemotherapy often damages bone marrow, reducing the production of blood cells and sometimes forcing doctors to lower drug doses or delay treatment cycles. A pilot study of 60 breast cancer patients found that drinking 60 cc (about 2 ounces) of wheatgrass juice daily during chemotherapy significantly reduced these complications. In the control group, 15 patients experienced events serious enough to require dose reductions or additional medications to boost blood cell production. In the wheatgrass group, only 5 did. Eleven of the 15 events in the control group were specifically related to blood cell damage. The wheatgrass did not interfere with the effectiveness of chemotherapy itself, which is a critical detail for any supplement used alongside cancer treatment.
Blood Health in Thalassemia
Thalassemia is a genetic blood disorder that often requires regular transfusions. Some early Indian studies reported that wheatgrass reduced transfusion needs by more than 25% in half of patients, with a few seeing reductions above 40%. However, a more rigorous controlled study could not replicate that benefit. Transfusion frequency and blood volume needed per year were the same in wheatgrass and control groups.
What the study did find was that fetal hemoglobin levels increased significantly in the wheatgrass group but not in the control group. Fetal hemoglobin is a form that works more efficiently in carrying oxygen, and higher levels can partially compensate for the defective hemoglobin in thalassemia. Wheatgrass also appeared to stabilize ferritin levels, a marker of iron overload that’s a major concern for people receiving frequent transfusions. So while wheatgrass didn’t reduce transfusion needs, it may offer some supportive benefits for blood chemistry in this population.
Antioxidant Content
Wheatgrass gets much of its nutritional reputation from its antioxidant profile. The dominant compounds are flavonoid glycosides, specifically isoorientin and isovitexin, which are found in the young leaves. These are bound to sugars in complex arrangements that affect how your body absorbs them. The base molecules (the active parts once the sugar is stripped away) are apigenin, luteolin, and chrysoeriol, all of which have well-documented anti-inflammatory and antioxidant activity in laboratory studies.
The chlorophyll content also contributes. Wheatgrass is roughly 70% chlorophyll by dry weight, and chlorophyll has its own antioxidant properties, though its absorption in the human gut is limited. The combination of chlorophyll and flavonoids likely accounts for the anti-inflammatory effects seen in digestive and blood-related studies.
Safety and Side Effects
Wheatgrass is generally well tolerated. The most common complaint is nausea, which is partly a reaction to the strong grass-like taste of the juice. In the breast cancer study, six patients stopped taking wheatgrass juice because it worsened their existing nausea from chemotherapy. No serious adverse effects have been reported in clinical research.
The bigger safety concern is contamination. Because wheatgrass is grown in warm, moist conditions for 7 to 10 days and consumed raw, it can harbor mold or bacteria. Memorial Sloan Kettering Cancer Center specifically flags microbial contamination as a risk. If you’re growing wheatgrass at home, proper drainage and airflow matter. If you’re buying juice or powder, look for products that are tested for contaminants.
Wheatgrass and Gluten
Despite coming from the wheat plant, wheatgrass harvested at the young leaf stage contains no detectable gluten. Research from the U.S. Department of Agriculture tested wheatgrass using two different gluten-detection methods and found levels below the limit of detection in all preparations. Gluten proteins are found in the seeds of the wheat plant, not the leaves. As long as wheatgrass is harvested before the plant begins producing seeds, it is safe for people with celiac disease or gluten sensitivity. The key is sourcing from a reputable supplier, since cross-contamination with wheat seeds during processing could introduce gluten.
How Much to Take
There’s no universally agreed-upon dose. The cholesterol study used 3.5 grams of wheatgrass powder daily, while the chemotherapy study used about 2 ounces of fresh juice. Most commercial wheatgrass products suggest 1 to 4 grams of powder or 1 to 2 ounces of juice per day, and these amounts are consistent with what’s been used in research. Starting with a smaller amount and increasing gradually is a practical approach, especially if you’re sensitive to the taste or prone to nausea.