Can Bearded Dragons Eat Onions? 4 Reasons to Avoid

Bearded dragons are fascinating reptiles known for their unique appearance and friendly nature.

As a responsible pet owner, providing them with a balanced and nutritious diet is crucial to ensure their overall health and well-being.

One common question that arises is, “Can bearded dragons eat onions?”

In this comprehensive guide, we will explore the topic of feeding your bearded dragon onion, discussing the potential risks and alternative food options.

So let’s dive in and discover whether onions are a suitable addition to your bearded dragon’s diet.

Can Bearded Dragons Eat Onions? 

No, bearded dragons should not be fed onions. Onions belong to the Allium family, which includes garlic, leeks, and chives.

These vegetables contain compounds that can be harmful to bearded dragons if consumed in large quantities. One such compound is thiosulfate, which can lead to oxidative damage to a bearded dragon’s red blood cells, potentially causing anemia and other health issues.

Therefore, it is best to avoid feeding your bearded dragon onion altogether.

The Risks of Feeding Onions to Bearded Dragons

While onions may be a common ingredient in human diets, they can pose significant risks to bearded dragons.

Here are some reasons why feeding onions to your pet reptile is not advisable:

Toxicity: Onions contain compounds that can be toxic to bearded dragons, leading to adverse health effects.

Hemolytic Anemia: Thiosulfate present in onions can cause oxidative damage to a bearded dragon’s red blood cells, potentially resulting in a condition called hemolytic anemia.

Gastrointestinal Upset: Onions are known to cause digestive issues in reptiles, including diarrhea and vomiting.

Unbalanced Nutrition: Onions do not offer significant nutritional benefits for bearded dragons, and feeding them may lead to an imbalanced diet.

The Nutritional Needs of Bearded Dragons

To provide the best care for your bearded dragon, it’s crucial to understand its nutritional requirements.

Bearded dragons are omnivorous, meaning they consume both plant matter and insects. Their diet should consist of a variety of vegetables, leafy greens, fruits, and appropriately sized insects to ensure they receive a well-rounded and balanced nutritional intake.

Here is a breakdown of the essential nutrients for bearded dragons:


High-quality protein is essential for bearded dragons’ growth and development.

Offer insects such as crickets, mealworms, and dubia roaches as sources of protein.

Ensure the insects are appropriately sized to avoid choking hazards.


Bearded dragons require a proper calcium-to-phosphorus ratio for bone health.

Dust insects with calcium powder before feeding them to your bearded dragon.

Provide calcium-rich vegetables such as collard greens and kale.


Vitamins are crucial for various bodily functions in bearded dragons.

Supplement their diet with vitamin D3, which aids in calcium absorption.

Offer a variety of vegetables and fruits to provide a range of vitamins.

Alternative Food Options for Bearded Dragons

While onions are off-limits, there are numerous other safe and nutritious food options that you can include in your bearded dragon’s diet. Here are some alternatives to consider:

Leafy Greens: Offer a variety of leafy greens, such as collard greens, mustard greens, and dandelion greens. These are rich in vitamins and minerals.

Squash and Bell Peppers: Both squash and bell peppers are excellent sources of vitamins and can add variety to your bearded dragon’s diet.

Berries: Bearded dragons can enjoy small amounts of berries, such as strawberries and blueberries, as occasional treats.

Insects: Appropriately sized insects like crickets, dubia roaches, and mealworms are crucial sources of protein for bearded dragons.

Remember to research each food item thoroughly before introducing it into your bearded dragon’s diet to ensure it is safe and nutritionally beneficial.

Frequently Asked Questions

Can bearded dragons have green onions?

No, bearded dragons should avoid all types of onions, including green onions. The compounds present in onions can be toxic and potentially harmful to your pet.

What should I do if my bearded dragon accidentally eats onions?

If your bearded dragon has consumed onions accidentally, monitor them closely for any signs of distress or abnormal behavior. If you notice any concerning symptoms, contact a veterinarian immediately for guidance.

Can bearded dragons eat onion powder or onion-flavored foods?

It is best to avoid feeding your bearded dragon foods containing onion powder or onion flavoring. Even small amounts of these substances can be harmful to your pet.

Are there any vegetables that should be avoided in a bearded dragon’s diet?

While bearded dragons can consume a wide range of vegetables, a few should be avoided, such as spinach and iceberg lettuce. These vegetables have low nutritional value and can cause digestive issues.

Can bearded dragons eat cooked onions?

No, cooking onions does not remove the compounds that can be harmful to bearded dragons. Therefore, it is best to avoid feeding cooked onions to your pet.


It is crucial to prioritize the health and well-being of your bearded dragon by providing them with a proper and balanced diet. While onions are commonly used in human cooking, they should never be included in a bearded dragon’s diet due to their potential risks and toxicity.

Instead, focus on offering a variety of safe and nutritious food options, such as leafy greens, squash, bell peppers, and appropriate-sized insects. 

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Mian Hasnat

As an animal lover since childhood, Mian Hasnat has always had a deep interest in the intricacies of animal life. His passion for animals has only grown over time, and he finds great joy in researching and writing about various aspects of the animal kingdom.

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