Herb & supplement monograph

Wheatgrass Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Wheatgrass interacts with medications. The heart of this page is the interaction list — every drug Wheatgrass is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Wheatgrass is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Wheatgrass Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Wheatgrass drug interaction appears low for most people, because every reported interaction is theoretical rather than proven in humans. None of the listed interactions are rated major, and all of them rest on animal or lab research only, not on human studies.

Interactions deserving the most attention

The combination most worth watching involves diabetes medications. Animal research suggests wheatgrass may prompt the body to release more insulin and lower blood sugar, so adding it could, in theory, increase the chance of low blood sugar in people whose glucose is tightly managed. Wheatgrass may also speed up an enzyme the liver uses to clear certain medications, which could make those medicines slightly less effective, though this has only been seen in lab studies.

What the rest of the list means

The long list of medications comes almost entirely from that one enzyme effect, so a large number does not mean many separate dangers. Most of these combinations have never been shown to cause meaningful changes in people, and the concerns remain predictions rather than documented problems.

Check your medications against Wheatgrass

Based on HelloPharmacist’s Wheatgrass interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Wheatgrass

272 medications have a known interaction with Wheatgrass, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Wheatgrass using our pharmacist-reviewed interaction data.

AI summaries are generated from our Wheatgrass interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Wheatgrass combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Wheatgrass affects

Every type of medication (drug category) Wheatgrass is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 2 drug categories Wheatgrass interacts with

Antidiabetes DrugsCytochrome P450 1a2 (cyp1a2) Substrates

Antidiabetes Drugs

Theoretically, taking wheatgrass with antidiabetes drugs might lower blood glucose levels and increase the risk of hypoglycemia.
Animal research shows that taking wheatgrass stimulates the release of insulin from beta-cells and lowers blood glucose.

Likelihood Possible Evidence D

Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, wheatgrass might decrease the levels and clinical effects of CYP1A2 substrates.
In vitro research shows that wheatgrass induces CYP1A2 enzymes.

Likelihood Possible Evidence D

Monograph

Wheatgrass: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Wheatgrass is the young grass of the wheat plant, taken as a juice or powder, and is mainly used as a concentrated source of vitamins and plant nutrients. Solid scientific evidence for most health claims is limited, and it is best viewed as a nutritional add-on rather than a treatment. It is generally well tolerated, but people with celiac disease, wheat allergy, or who are pregnant should be cautious and check with a healthcare provider.

Scientific name: Triticum aestivum
Family: Poaceae
Part used: Young grass (leaves/shoots) of the wheat plant
Common forms: Fresh juice, powder, tablets, capsules, and added to smoothies or health drinks

People commonly use it for

General nutrition support
Digestive health
Antioxidant support
Energy and wellness
Arthritis symptoms
Detox or cleansing routines

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated as a food, but quality and contamination concerns mean caution is wise.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Wheatgrass is the young, green grass of the common wheat plant, Triticum aestivum. It is harvested while the grass is still very young and tender, before the plant forms grain. It can be grown indoors in trays or on farms in many parts of the world.

People most often take wheatgrass as a fresh-squeezed juice, a dried powder, or in tablet and capsule form. The powder is popular because it can be stirred into water, juice, or smoothies. Wheatgrass is marketed as a "superfood" and a concentrated source of vitamins, minerals, chlorophyll, and plant antioxidants.

How it works

Wheatgrass contains chlorophyll, vitamins (such as some B vitamins, vitamin C, and vitamin K), minerals, amino acids, and various plant antioxidants. Supporters believe these compounds give it antioxidant and anti-inflammatory effects.

In laboratory and animal research, antioxidant plant compounds may help neutralize unstable molecules called free radicals and calm certain inflammatory signals. However, these proposed mechanisms are based largely on test-tube and animal studies, and it is not clear how strongly they apply when a person drinks wheatgrass juice or takes the powder.

Effectiveness

Does Wheatgrass work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 17 uses evaluated

17 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Wheatgrass, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 17 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Benign prostatic hyperplasia (BPH)