Guava is a fruit thatis usually 4 to 12 centimetres long. They are round or oval depending on the species.
They have a very typical fragrance, which is quite similar to lemon rind but not as sharp.
It has a rough outer skin that can vary in taste depending on the species and is usually green before maturity, but becomes yellow, maroon, or green when ripe. Its pulp is sweet or sour depending on the species.
So can bearded dragons eat guava?
In particular, their acidic, calcium, phosphorus, water, protein, fat, sugar, and fibre content is of most interest when it comes to bearded dragons.
Another thing of importance is the calcium:phosphorus ratio as for every part phosphorus, there needs to be another part calcium if not more. From 1:1 to 2:1 is ideal as far as bearded dragons are concerned.
As you can see guava is quite acidic and also has a disproportionate calcium:phosphorus ratio. It also has quite a lot of sugar in it.
This means that they can eat it in small amounts very occasionally, but it is not a good food for bearded dragons to eat because of its acidic, phosphorus and sugar content.
There are better foods for the out there.