Besides seeds, grains and all kind of fresh food like fruit, vegetables or native grasses, there is some other food which is healthy for budgies. In addition to that, pet shops offer an abundance of food supplements and powders for supporting a bird's health which are more or less expensive. Whether feeding a budgie with such supplements is reasonable or necessary cannot be said in general, it depends on the situation in each case.
You can find further information on such food supplements and on other food budgies are allowed to eat. Please feel free to drop me a line and share your experience with me if you think that there is something missing in this chapter. Finally, I would like to stress that it's not my aim to make any advertisement for certain products here.
This chapter in Turkish on muhabbetkusu.org 
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