13 Dangerous Side Effects Of Cilantro You Should Know

Recognizing hidden cilantro hazards ensures every meal stays flavorful and worry-free.

By Sneha Tete, Integrated MA, Certified Relationship Coach
Created on

Cilantro is a popular herb integral to cuisines worldwide, cherished for its fresh flavor and distinctive aroma. While it is celebrated for its culinary value and promising health benefits, cilantro is not entirely free from risks. Overconsumption or individual sensitivities can result in a variety of unpleasant — and sometimes serious — health side effects. This article explores the potentially dangerous side effects of cilantro, discusses allergic reactions and drug interactions, and provides clear tips on safely incorporating this herb into your diet.

Table of Contents

Top 13 Side Effects of Cilantro

While most people can enjoy cilantro without issue, excessive use or sensitivity can provoke a spectrum of adverse reactions. Here are the thirteen most reported side effects of cilantro:

  1. Liver Damage

    Excessive intake of cilantro may adversely affect liver function. The herb’s volatile essential oils and potent antioxidants, when consumed in excessive quantities, can overstimulate the liver, possibly increasing bile secretion and causing liver strain. Though rare, individuals with liver diseases should limit cilantro to avoid exacerbating their condition.

  2. Low Blood Pressure (Hypotension)

    Cilantro has been linked to a drop in blood pressure when taken in high amounts. This effect, while potentially beneficial for some, may result in dangerously low blood pressure, dizziness, lightheadedness, and even fainting in others.

  3. Upset Stomach

    Cilantro is known for soothing mild gastrointestinal complaints in moderation. However, overconsumption — especially in extract form — can cause excess gas, stomach pain, abdominal cramps, bloating, vomiting, and sometimes loose stools.

  4. Diarrhea

    Several reports and anecdotal evidence indicate that cilantro can induce diarrhea, particularly when consumed excessively. The herb may disturb digestive balance for some individuals, leading to frequent or watery bowel movements.

  5. Breathing Problems

    Some people experience respiratory symptoms such as difficulty breathing or chest tightness after consuming cilantro, particularly if they are allergic to the herb.

  6. Chest Pain

    Rarely, chest pain has been reported among cilantro consumers. This could signal a more serious allergic reaction or another underlying issue, and should warrant prompt medical attention if persistent.

  7. Skin Sensitivity

    Direct contact with cilantro leaves or stems can cause skin rashes, itching, or hives, especially in those with underlying sensitivities.

  8. Allergic Reactions

    Cilantro can trigger a variety of allergy symptoms, ranging from mild rashes and itching to severe cases involving facial swelling, throat swelling, hives, or even anaphylaxis.

  9. Photosensitivity

    Cilantro may increase skin sensitivity to sunlight, leading to greater risk of sunburn or photodermatitis. People with lighter complexions or sun sensitivity should use caution when adding large quantities of cilantro to their diet.

  10. Hormonal Effects

    Some anecdotal reports suggest that cilantro might mildly influence hormone levels or menstrual cycles, but robust scientific evidence is limited. As a precaution, individuals experiencing hormonal imbalances should moderate cilantro intake.

  11. Darkened Skin Patches

    Rarely, high consumption has been linked to hyperpigmentation, where patches of the skin may darken. This side effect is uncommon but worth noting.

  12. Flu-like Symptoms

    Outbreaks of intestinal illness resembling flu have been linked to cilantro contaminated by the parasite Cyclospora cayetanensis. Symptoms include fatigue, muscle aches, diarrhea, and vomiting. Always wash cilantro thoroughly before use.

  13. Abnormal Taste Perception

    Cilantro naturally contains certain aldehydes which, due to genetic variation (specifically the OR6A2 gene), can make it taste ‘soapy’ to some individuals. While not a danger in itself, it may cause aversion or digestive discomfort.

Short-Term vs. Long-Term Effects

Short-Term EffectsLong-Term Effects
Abdominal cramps, vomiting, diarrhea, hives, swelling, rash, chest tightnessLiver damage, possible kidney stones, persistent skin pigmentation

Short-term side effects often resolve upon stopping cilantro, while long-term effects may require medical consultation.

Drug Interactions

  • Sedative Medications: Cilantro may enhance the effect of sedatives, leading to excessive drowsiness or impaired alertness if consumed in large quantities.
  • Drugs That Slow Blood Clotting (Anticoagulants): Cilantro slows blood clotting and taken in excess may increase the risk of bleeding for individuals on blood thinners or with clotting disorders.

Precaution: Always consult your doctor before adding large amounts of cilantro to your diet if you take prescription medications for sleep or blood-dilution.

When To See A Doctor

  • If you experience severe allergic symptoms: swelling, difficulty breathing, chest pain, or hives.
  • When digestive issues persist despite avoiding cilantro.
  • If blood pressure drops significantly or you feel lightheaded after consuming cilantro.
  • Upon noticing new or worsening liver or kidney problems while consuming cilantro regularly.

Prompt medical advice can prevent potentially dangerous complications. Severe cases or anaphylaxis require immediate emergency care.

How To Safely Incorporate Cilantro Into Your Diet: Tips And Precautions

  • Start Slow: Begin with small portions to gauge individual sensitivity before increasing intake.
  • Monitor Symptoms: If you notice any respiratory, skin, or digestive discomfort, discontinue use and consult a healthcare provider.
  • Cook When Possible: Cooking cilantro may decrease the likelihood and severity of allergic reactions in sensitive individuals.
  • Be Aware Of Related Allergies: If you are allergic to plants in the Apiaceae family (parsley, dill, fennel), exercise additional caution.
  • Wash Thoroughly: Rinse cilantro under running water to minimize the risk of parasite and pathogen contamination.
  • Watch For Photosensitivity: Limit sun exposure or use sunscreen if you consume large amounts of cilantro due to increased risk of sunburn.
  • Inform Your Doctor: Let your physician know about significant cilantro intake if you are on sedatives, anticoagulants, or have liver/kidney conditions.

Key Takeaways

  • Cilantro is generally safe, but can have dangerous side effects in sensitive individuals or when over-consumed.
  • Allergic reactions, digestive issues, and drug interactions are the most common concerns.
  • People with pre-existing liver or kidney problems, or those on specific medications, should monitor their cilantro intake carefully.
  • If you experience swelling, shortness of breath, hives, or digestive distress after eating cilantro, seek medical advice promptly.
  • Safe consumption practices involve starting with small amounts, avoiding related allergens, and thorough washing.

Frequently Asked Questions (FAQs)

Q: Can cilantro cause a severe allergic reaction?

Yes. Though uncommon, cilantro allergies can trigger anaphylaxis — a potentially life-threatening condition marked by difficulty breathing, throat swelling, and shock. Immediate emergency attention is crucial if symptoms like facial swelling, trouble breathing, or a fast heartbeat occur.

Q: How much cilantro is safe to eat daily?

Cilantro is considered safe in culinary amounts. Adverse effects have been reported with large amounts, such as over 200 grams of extract per week. Moderation is recommended for all users.

Q: Who should avoid cilantro?

People with known allergies to cilantro or related plants (parsley, dill, fennel), those with liver disease, individuals on blood thinners, and people with a history of severe allergic reactions should use cilantro only under medical guidance.

Q: Can cilantro interact with medications?

Yes, especially sedatives and anticoagulants, as cilantro may increase drowsiness or bleeding risk respectively. Always consult your healthcare provider before combining cilantro with these drugs.

Q: Does cilantro cause problems during pregnancy?

There is insufficient evidence regarding cilantro safety during pregnancy or breastfeeding. Better to stick with regular food amounts and consult a healthcare professional before using it medicinally.

Q: Why does cilantro taste like soap to some people?

This is due to genetic variation in the OR6A2 gene, making certain people sensitive to specific aldehydes in cilantro that create a soapy flavor.

Q: Can cilantro toxicity be reversed?

Most side effects resolve after discontinuing cilantro. However, persistent or severe symptoms should be managed by a medical professional as organ involvement (liver, kidney) may require intervention.

Q: How can I reduce the risk of cilantro contamination?

Wash cilantro thoroughly under running water and avoid consuming it raw in places with a higher risk of parasite contamination.

Sneha Tete
Sneha TeteBeauty & Lifestyle Writer
Sneha is a relationships and lifestyle writer with a strong foundation in applied linguistics and certified training in relationship coaching. She brings over five years of writing experience to thebridalbox, crafting thoughtful, research-driven content that empowers readers to build healthier relationships, boost emotional well-being, and embrace holistic living.

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