SuperSaiyan
Questions are good, and most welcome. It's the best way to learn. Here on the Forum, you have many bird lovers, and bird breeders, some who have been involved with birds for many many years.
In regards to the Prime Vitamins, I am not familiar with them . I use a different 'German' brand called Nekton, and only once or twice a week .
That said, I am a strong believer in trying to supply all of my birds' needs through natural means, using supplements only as a '
supplement' in case I miss something in their diet.
I guess you could look at it this way.
If you were to eat only rice and take Vitamins, instead of eating meat, fish, eggs, milk, vegetables, fruits, grains and so on, you probably would not be very healthy.
That's why I recommended what I did in my other post further up, in regards to diet, Calcium sources and so on. The suggestions I made, are important for your birds health and happiness, and if you want birds who will breed for you and remain healthy and alive, I would strongly recommend reading it over again.
Good luck, and enjoy your birds.