What Are The Side Effects Of Wheatgrass?

Reviewed By Registered Dietitian Nutritionist and certified Personal Trainer Alexandra Dusenberry, MS, RDN
Written by Ravi Teja Tadimalla

Wheatgrass is a potent food with important benefits. The newly sprouted leaves of the plant are rich in nutrients and generally considered safe for health. However, there is limited research available to support the claims.

The intake of wheatgrass has also been linked to certain side effects in the past. Some of these include headache, nausea, and allergies.

Does research have anything to state about these adverse effects? In this post, we will explore that and the ways you can prevent the side effects.

Scroll down to find out.

11 Side Effects Of Wheatgrass

Wheatgrass – A Brief

Wheatgrass is the young grass of the wheat plant named Triticum aestivum. Wheatgrass is available in the form of juice, powder, capsules, pills, and tablets.

It is sold in the market either as juice or a powdered concentrate. Commercially, wheatgrass is also available as a cream, gel, spray, and massage lotion.

The history of the plant can be traced back to over 5,000 years when it was first thought to be used in ancient Egypt. It is believed that the Egyptians had preserved the leaves of the plant and used them for improving health and beauty.

How Is Wheatgrass Bad For You?

Wheatgrass is known to offer an array of health benefits. Some feel it boosts energy levels, while others believe it could work as a performance enhancer.

Though it is usually considered safe, there have been cases of adverse effects following its consumption. Since it is grown within the soil and consumed raw, wheatgrass also has an increased risk of contamination that can lead to severe issues.

More importantly, wheatgrass is not exceedingly nutritious when compared with other vegetables. Hence, if you are to include it in your diet, it must be along with other veggies as well.

There also is inadequate information on its long-term usage, especially as medicine.

We will now look at the potential side effects of wheatgrass.

Side Effects Of Wheatgrass

1. May Cause Headache

Some people have reported headaches after drinking wheatgrass juice (1). Though the juice acts as a treatment for headache and nausea, excess intake may lead to a headache (2). Some believe the headache could also be a sign of your body’s general intolerance to the juice.

Taking the juice in fewer quantities could reduce the risk of headaches. The methanol extract of the juice was found to be safe at a dose level of 2000 mg per kg of body weight (3).

You may also mix the juice with any other juice to mask its taste. If the headache persists, visit your doctor right away.

Wheatgrass contamination is said to be often caused by an organism called Listeria monocytogenes. This organism can cause serious side effects, one of them being severe headaches (4).

2. May Cause Nausea

Nausea could also be attributed to your body’s intolerance to wheatgrass. Though some assume this nauseated feeling is due to detoxification, there is no evidence supporting this belief. If your nauseating symptoms persist, please visit your doctor.

Wheatgrass was found to cause nausea in six patients involved in chemotherapy treatment (5).

Some believe wheatgrass contains gluten. It could cause adverse symptoms, including nausea, in people who are glucose-intolerant (6). However, a research paper concludes that wheatgrass contains no gluten (7). Hence, more research is required to understand this effect.

3. May Cause Allergies

Some individuals could be allergic to wheatgrass, especially when they consume it in the pill or juice form. You might develop symptoms in different parts of the body within a few moments of consuming wheatgrass. This usually happens due to the overproduction of certain chemicals that combat the suspected allergen.

If you are allergic to wheat products, it is recommended you stay away from wheatgrass as well (5).

The symptoms of wheatgrass allergy are yet to be studied. As per anecdotal evidence, such allergy may cause nausea, cramping, vomiting, and diarrhea. Your skin might get inflamed and break out into hives. Other allergic reactions may include shortness of breath and congestion.

Due to a lack of information, it could be difficult to attribute any of these symptoms to wheatgrass. But if you experience any of these signs after taking wheatgrass, stop the intake and visit your doctor.

As previously discussed, wheatgrass does not contain gluten.

This is because it is made out of the stem and leaves, whereas gluten is found in the kernel of the seed. But if one of the seeds is accidentally included, it could get contaminated with gluten. Hence, individuals with gluten intolerance are recommended to practice caution while taking wheatgrass. Read the ingredient labels before purchasing any product.

4. May Cause Constipation

Some believe taking wheatgrass juice could lead to constipation, but there is no evidence to prove this statement. However, if you experience such a condition that does not improve even after a few hours, please consult your doctor.

5. May Cause Stained Teeth

This is a harmless side effect. Wheatgrass juice/shot is green. Taking it could temporarily stain your teeth. You can remove the stains by brushing your teeth properly afterwards.

6. May Cause Mold Development

Wheatgrass is a sprouted grass that is grown in moist conditions. Hence, it may lead to mold development if no proper care is taken. If you find any such mold, it is best to throw the grass away.

The most common type of mold to affect wheatgrass is the ‘blue fuzz’ mold. This type of mold may not be harmful and can simply be washed away from the surface of the grass. But other types of mold (like the brown and white types) mean spoilage, and the grass must be thrown away in this case.

7. May Suppress Appetite

Though this may be beneficial for those looking to lose weight, long-term effects of appetite suppression are not known. Also, there is no evidence suggesting that wheatgrass may actually suppress appetite.

8. May Cause Dizziness And Fatigue

Anecdotal evidence suggests that undiluted wheatgrass juice may cause dizziness and fatigue in certain individuals. This could be attributed to wheatgrass contamination. If you experience any such symptoms, please visit your doctor immediately.

9. May Cause Rashes

This can also be attributed to a form of allergy. Some individuals may experience rashes as their skin may get inflamed after drinking wheatgrass juice. The exact cause for this is yet to be studied.

10. May Cause Mild Fever

Some believe wheatgrass could detoxify the body and may cause mild fever in the process. However, none of the claims have been substantiated by evidence. If you experience fever that persists after taking wheatgrass juice, please consult your doctor.

11. Might Have Contaminants

This can be related to mold formation. Wheatgrass is grown in a moist environment. This puts it at the risk of contamination. Ensure you procure your wheatgrass juice from a trusted supplier. This way, you can avoid food borne illnesses, like upset stomach and vomiting.

If you are growing wheatgrass at your home, you can prevent any contamination by sterilizing the trays where the harvesting happens. You can also seal the wheatgrass in plastic bags to avoid cross-contamination in your kitchen.

The major concern with wheatgrass is the possibility of contamination. Most of the other side effects listed above are yet to be backed by research. While it is important to know the possible adverse effects, taking the right precautions can help you avoid them.

Precautions To Be Taken

  • Wheatgrass juice is usually concentrated. Hence, taking it in less quantities or in combination with other vegetable juices can mask its strong taste.
  • If your wheatgrass juice tastes bitter, it is most likely to be moldy. Stop drinking and discard it immediately.
  • To avoid contamination, you can sterilize the trays in which wheatgrass grows.
  • Store your wheatgrass powder supplement according to the instructions on the pack.


Ensure the wheatgrass you get from the market is fresh as it often is at a high risk of contamination. If you experience any symptoms or allergies following its intake, please visit your doctor immediately.
Though wheatgrass could have some benefits, taking it in excess could not be safe. There is limited information on the dosage of wheatgrass. You may check with your health care provider for the same.

Frequently Asked Questions

What are the side effects of wheatgrass shots or supplements?

The side effects of wheatgrass shots or supplements are similar to the plant itself. If you are taking the shots or supplements, stick to the recommended dosage.
Also, if you are purchasing the juice or supplement from the market, check the label to ensure it is gluten-free.

What are the side effects of wheatgrass cream?

There is no enough information about the safety of the long-term use of wheatgrass cream. But as per anecdotal evidence, the cream is possibly safe for most adults when applied to the skin for a duration of six weeks.

Can I take wheatgrass on an empty stomach?

Though certain sources say that is the only way to take it, there is no proper evidence. Please consult your doctor.


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Ravi Teja Tadimalla is an editor and a published author. He graduated from SRM University, Chennai, and has been in the digital media field for over six years. He has a Professional Certificate in Food, Nutrition & Research from Wageningen University. He considers himself a sculptor born to chip away at content and reveal its dormant splendor. He started his career as a research writer, primarily focusing on health and wellness, and has over 250 articles to his credit. Ravi believes in the great possibilities of abundant health with natural foods and organic supplements. Reading and theater are his other interests.