Below are the nutrition details for Mangos (according to the USDA).
Mangos (raw)Per 100g Serving
Areas of Interest
Overall mangos are fairly healthy, there's just a few areas of concern.High Sugar Content
All fruits contain sugar, but few fruits contain more natural sugar than mangos. A 100g serving of mango contains 13.6g of sugar which is a lot for a bearded dragon. For reference, 100g of Coca-Cola® contains 9g of sugar. High sugar diets can lead to obesity and dental issues in bearded dragons so mangos should be used as treats rather than a common part of their diet.High Vitamin A
Vitamin A is great to have in your bearded dragon's diet. You should only be concerned with this if you beardie is regularly given vitamin A supplements containing retinol (synthetic vitamin A). Retinol overdose (vitamin A toxicity) occurs when a bearded dragon's body is given more vitamin A than it can safely absorb. If you do use a retinol multivitamin you should recalculate the dosage as it may need to be reduced to compensate for the already ingested vitamin A. If you use a multivitamin containing beta-carotene (natural vitamin A) you have nothing to worry about as natural vitamin A has zero overdose risk.Calcium Phosphorus Ratio
Ideally the healthiest foods have more calcium than phosphorus. This is because phosphorus blocks calcium from being absorbed, which can cause issues if the calcium is not provided from other foods or supplements. Mangos have less calcium than phosphorus which means your beardie will need to be fed a calcium-rich food along with the mango to keep their meal balanced.