Yes — guava is safe and exceptionally high in vitamin C, seeds and all.
Keeper's noteA great way to add variety and vitamin C. The whole fruit — skin, flesh, seeds — is edible once washed.
Why guava is good for parrots
Guava carries several times the vitamin C of an orange, plus fiber and vitamin A, and the small seeds are safe to eat. It's one of the more nutrient-dense tropical fruits you can offer, with no preparation hazards.
How to serve it
Wash, then slice; skin and seeds are safe.
Offer fresh; skip guava juice and paste (added sugar).
Pairs well in tropical chop with papaya and mango.