Unexpected Side Effects Of Coriander Seeds: What You Should Know

Even pantry staples can upset digestion, alter hormone balance, and heighten sun sensitivity if overused.

By Medha deb

Created on Sep 18, 2025

Even pantry staples can upset digestion, alter hormone balance, and heighten sun sensitivity if overused.

Coriander seeds, Coriandrum sativum, have been an integral part of kitchens worldwide for centuries, renowned for their flavor and multiple health-promoting properties. While celebrated in traditional and modern cuisines as well as natural remedies, coriander seeds also carry potential health risks that are often overlooked. Being aware of these adverse effects helps ensure you reap the benefits safely and avoid unnecessary health complications.

Introduction to Coriander Seeds
Allergic Reactions
Gastrointestinal Issues
Increased Sun Sensitivity
Hormonal Effects
Blood Sugar Lowering and Hypoglycemia
Blood Pressure Fluctuation
Interactions With Medications
Caution During Pregnancy & Specific Populations
Other Possible Side Effects
How To Consume Coriander Seeds Safely
Frequently Asked Questions

Introduction to Coriander Seeds

Coriander seeds are the dried fruits of the coriander plant and are used extensively in a variety of cuisines for their citrusy, warm flavor. In addition to their culinary value, these seeds have been traditionally used in various home remedies for digestive, anti-inflammatory, and antimicrobial purposes. However, as with many herbal remedies and spices, coriander seeds are not without potential drawbacks. Side effects, though typically rare or mild, can occur—especially with excessive use or in sensitive individuals.

1. Allergic Reactions

Some people may experience allergic reactions after consuming coriander seeds. The symptoms of coriander allergy may include:

Skin rashes, redness, or itching
Swelling of lips, tongue, or throat
Respiratory distress such as difficulty breathing
Gastrointestinal upset in severe cases

The risk of reaction is higher in those who are allergic to other members of the Apiaceae family (such as celery, carrots, parsley, or fennel). For such individuals, even small amounts of coriander seeds can trigger symptoms, ranging in severity from mild to life-threatening anaphylaxis in very rare cases. If you develop any skin irritation or swelling after consuming coriander, discontinue use and seek medical help.

2. Gastrointestinal Issues

Gastrointestinal discomfort is among the most commonly reported side effects of coriander seeds. When consumed in excess, coriander seeds may:

Cause a mild laxative effect
Lead to abdominal pain
Trigger diarrhea or loose stools
Cause nausea or, rarely, vomiting
Contribute to cramping and mild indigestion

Individuals with sensitive digestive systems, irritable bowel syndrome (IBS), or pre-existing gastrointestinal conditions should use coriander seeds with caution, as moderate to large quantities can exacerbate symptoms.

3. Increased Sun Sensitivity

Coriander seeds can make the skin more sensitive to sunlight (a condition known as photosensitivity). This increases the risk of sunburn, rashes, and, in extreme cases, long-term skin damage or increased risk of skin cancer. Those with lighter skin tones or a history of sun allergies should take special precautions.

Limit exposure to direct sunlight if you consume large amounts of coriander seeds regularly.
Apply sunblock or wear protective clothing when going outdoors.
Monitor your skin for any unusual reactions after sun exposure.

4. Hormonal Effects

Coriander seeds contain phytoestrogens, plant-based compounds that mimic the effect of estrogen in the body. This property can:

Potentially disrupt natural hormonal balance if consumed excessively
Lead to irregular menstrual cycles in rare cases
Possibly cause symptoms such as mood swings or breast tenderness in sensitive individuals

This effect is particularly relevant when coriander seeds are consumed in concentrated forms, such as coriander seed water or supplements.

5. Blood Sugar Lowering and Hypoglycemia

Coriander seeds have been shown to lower blood sugar levels. While this is helpful for many people with diabetes, it can pose risks:

May cause blood sugar to drop too low (hypoglycemia) if consumed with anti-diabetic medications
Can result in symptoms such as sweating, dizziness, tremor, confusion, or fainting
If you take insulin or oral hypoglycemics, monitor your blood sugar closely and consult your doctor before using coriander seeds as a remedy

This hypoglycemic effect is one reason why coriander-based remedies should be used judiciously by individuals with blood sugar regulation issues.

6. Blood Pressure Fluctuation

Coriander seeds may also improve heart health by lowering blood pressure, but this property is a double-edged sword:

Beneficial for those with high blood pressure
May cause problems for people already on antihypertensive medications, leading to abnormally low blood pressure (hypotension)
Can cause symptoms such as dizziness, lightheadedness, dizziness upon standing, and even fainting in susceptible individuals

If you already have low blood pressure or are on medication to reduce it, discuss safe doses with your healthcare provider before adding coriander seeds to your regimen.

7. Interactions With Medications

Coriander seeds can potentiate or interfere with the effects of certain medications, such as:

Blood sugar-lowering drugs for diabetes
Antihypertensive medications
Anticoagulants and antiplatelet agents (due to possible mild blood-thinning properties)
Drugs that affect hormonal balance

Such interactions may result in an increased risk of hypoglycemia, hypotension, or even bleeding in rare cases. Always inform your physician about any herbal remedies or spices you are consuming, particularly in large doses, if you are on chronic medications.

8. Caution During Pregnancy & Specific Populations

Pregnant and breastfeeding women should be cautious with coriander seeds, particularly in herbal doses:

There is insufficient research about the safety of high doses in pregnancy or lactation.
Coriander seed use in moderate culinary amounts is generally considered safe.
Pediatric and geriatric populations, as well as people with chronic illnesses, should use coriander seeds with added caution.

Always consult a doctor before using coriander seeds in medicinal forms or in large quantities when pregnant, breastfeeding, or under medical care for other conditions.

9. Other Possible Side Effects

Skin irritation: Application of coriander seeds or oil to the skin may cause rashes, redness, or contact dermatitis in sensitive persons.
Kidney strain: Very large amounts of coriander seed water might increase urination, potentially straining kidney function (especially in those with pre-existing renal issues).
Acid reflux and heartburn: Some individuals have reported symptoms like reflux when consuming coriander seed water or large doses of seeds.
Respiratory discomfort: Rare cases of throat dryness or tightness have been observed in people after prolonged or high-dose use, mostly among individuals with asthma or allergies.

How To Consume Coriander Seeds Safely

Use coriander seeds in moderate culinary amounts.
Start with small doses if you are trying coriander seeds for the first time.
Monitor for adverse reactions, especially if you have allergies or are on medication.
Consult your healthcare provider if you plan to use coriander seeds for therapeutic purposes or in large quantities, especially if you have pre-existing conditions or are pregnant/breastfeeding.
If skin contact causes irritation, stop using topically or use protective gloves.

Moderation is the golden rule: even natural remedies can have significant impacts when overused or misused.

Frequently Asked Questions

1. Can coriander seeds cause serious allergies?

Yes, although rare, coriander seeds can cause moderate to severe allergic reactions, particularly in people sensitive to other members of the Apiaceae plant family.

2. Are coriander seeds safe for people with diabetes?

Coriander seeds may help lower blood sugar, but those on glucose-lowering medications should monitor levels carefully and consult a doctor to avoid hypoglycemia.

3. Is it safe to use coriander seeds during pregnancy?

There is not enough research to confirm the safety of large or medicinal doses during pregnancy or breastfeeding. Culinary use is generally safe, but doses beyond food amounts should be discussed with your healthcare provider.

4. How much coriander seed is safe to consume daily?

Most experts recommend keeping daily intake within typical culinary amounts (about 1-2 teaspoons of seeds) unless advised otherwise by a professional.

5. Can coriander seeds be used for treating digestive issues?

Yes, coriander seeds have been used to ease bloating and indigestion. However, overuse may cause opposite effects, such as diarrhea or stomach discomfort.

6. Who should avoid coriander seeds?

People with a known allergy to coriander or related plants, those on diabetes or blood pressure medications, pregnant/breastfeeding women (in high doses), and individuals with digestive sensitivities should exercise added caution.

Conclusion

Coriander seeds are packed with flavor and health benefits, but being aware of their potential side effects ensures that you continue to use them safely. Know your sensitivities, consult your healthcare provider as needed, and remember that moderation is essential when it comes to any herbal remedy or spice.

References

Author

medha deb

Medha Deb is an editor with a master's degree in Applied Linguistics from the University of Hyderabad. She believes that her qualification has helped her develop a deep understanding of language and its application in various contexts.

Read full bio of medha deb