Another note on this. I agree with JP. Even if a pellet had all the nutrition value that a parrot needs it definitely lacks the life enriching colors, textures, tastes and possible foraging options provided by a wide array of foods that we can offer our birds.We all rely on pellets as a base. I'm only suggesting you don't rely on them too much.
The latest studies show parrots in the wild have a very wide and varied diet. Look up the diet section on this forum