Crested Geckos, Diet and Food, Geckos

2 Reasons Why You Shouldn’t Feed Avocados To Crested Geckos 

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by The Pet Engineers


Can crested geckos eat avocados? Should you feed avocados to your crested gecko? The fact that we humans can consume some foods without adverse effects doesn’t mean it won’t be the same for our pets.

Avocados are such food that should be avoided when feeding geckos. Here’s why you shouldn’t feed avocados to a crested gecko. 

Can Crested Geckos Eat Avocados?

Yes, crested geckos can eat avocados. But, you shouldn’t feed them to your crestie if you want it to live. 

Should You Feed Crested Geckos Avocado?

No, you shouldn’t feed crested geckos avocados. Avocados shouldn’t be eaten by crested geckos.

In the most severe scenario, avocados can cause death. Hence they should be avoided and not included in your crested gecko’s diet. 

Why Are Avocados Bad For Crested Geckos?

Two reasons why avocados are bad for crested geckos are:

High in oxalic acid

Avocados contain high amounts of oxalic acid which are dangerous to geckos. Oxalic acid can cause metabolic bone disease because they bind calcium and magnesium preventing absorption.

This results in metabolic bone disease and if not treated injuries or death. 

Contains a dangerous compound called persin

Avocados contain a natural, oil-soluble fungicide called person. Although not harmful to humans unless eaten in massive quantities. Persin is toxic to most animals. If persin is ingested.

It will cause inflammation, heart rhythm problems, and death. This is the biggest reason why avocados shouldn’t be given to crested geckos. 

Persin chemical structure

What Is The Ratio Of Calcium To Phosphorus In Avocado?

The ratio of calcium to phosphorus in avocado is 1:40.4. This indicates that there is forty as much phosphorus as calcium in the avocado. 

Importance of Calcium to Phosphorous Ratio in Gecko Diet

Crested geckos should eat a diet that has a Ca:P ratio of 2:1, 1:1, or 1:0.5. The ratio you decide to feed your gecko can affect their growth, metabolism, and health.

If the gecko consumes calcium above what it needs, it is excreted in its urine.

If they consume too much phosphorus, they store it in their bones and teeth, which can lead to problems like kidney stones and metabolic bone disease.

Nutritional Value Of Avocado

Nutritional value of avocado
Nutritional value of avocado

How To Calculate Ca:P Ratio

You can figure this out by calculating the Ca:P ratio using the formula given below. 

According to the nutritional content, the Ca:P ratio is 18mg:727mg. Dividing through by 18 (calcium). The ratio becomes 1:40.4.

How Does Oxalic Acid Affect Your Pet?

Oxalic acid is not a nutrient or essential dietary component and it is not required for normal growth or health.

When oxalic acid is consumed, it binds to the calcium and magnesium in the body and prevents them from being absorbed.

This can lead to calcium deficiency which can be harmful to your pet. Crested geckos are strict insectivores and may not benefit from the oxalic acid in the food and may not be able to digest it.

Some people recommend soaking and rinsing the fruits to get rid of the oxalic acid. However, this is not proven to be effective.

What is the Oxalic Acid Level In Avocado?

Avocados have an oxalic acid level of about 19mg, which is considered high. In addition to this, avocados contain persin – a chemical dangerous to crested geckos.

For this reason, avocados should be fed to crested geckos. 

Avocados are high in oxalic acid

5 Alternatives To Avocado

Now that you know avocados shouldn’t be fed to your crestie. Here are 5 alternatives to avocados:


Blueberries are great for your gecko and can be a healthy addition to their diet. They contain a lot of antioxidants that boost their immune system and reduce the risk of diseases.

Furthermore, they are an excellent source of vitamin C and fiber.

blue berries

Calci worms

Calci worms are the larvae of the black soldier fly and contain large amounts of calcium. If you want to boost your crested gecko’s calcium intake, they are the best.

Great to promote healthy growth in bones, teeth, and muscles. Also, if your crestie is suffering from metabolic bone disease calci worms can help reduce symptoms. 

Calci worms


Blackberries are rich in calcium and contain flavonoids which help your crested gecko to stay healthy.

They contain low amounts of oxalic acid making them not harmful to your gecko. They are best served when sliced up into small pieces.

handful of blackberries


Mealworms are rich in proteins and fat. Excellent for baby and juvenile crested geckos since they require the most protein for their development.

A low-risk food that doesn’t contain pathogens that may cause sickness in your crested gecko.



Waxworms are the larvae of the wax moth and are a great alternative to avocados.

They contain a good amount of protein, fat, and no toxins that can cause harm to your pet. These can be fed either whole or blended to a paste. 



The high amount of oxalic acid and the presence of persin in avocados are the two main reasons why they should be avoided.

Avocados can cause heart problems, inflammation, or even death when a large amount is consumed.

Fortunately, there are so many healthy alternatives to avocados that can be fed to your crested gecko. 

The Pet Engineers

A team of pet lovers. We have owned various pets over their years. From dogs to reptiles, etc. Our love of pets, strive to us to create up-to-date and accurate helpful guides on pets.

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