Also try offering them grapes and assorted berries. Vegetables Cockatiels just love veggies, cooked and fresh. Give them shredded carrots, small pieces of squash, zucchini, celery, peas, corn, and beans. You can also give them frozen vegetables that have been thawed. Protein Chopped boiled eggs are a good source of extra protein, especially during moults.
Cereals Look for the inexpensive generic brands like puffed wheat and rice and uncooked rolled oats.
Check the boxes for content. Ideally you want cereals with no sugar or salt. Remember, vitamins loose their potency in water. It should be changed daily. Change Change of any kind can cause a bird to become stressed if it is not accustomed to variety in its environment.