Vitamin C is an interesting vitamin. I believe that in captivity it is vital that your bird receives vitamin C from whole foods just as it would in the wild from the fresh foods available in their native habitat. Now, I'd like to tell you about vitamin C's composition. Vitamin C is called ascorbic acid, but the ascorbic acid is the antioxidant protector of the vitamin C complex. In the same way that an eggshell is the protector of the contents of the egg.
Vitamin P strengthens the vascular system.
Vitamin K promotes prothrombin, which aids in coagulation. Birds who tend to bleed easily do not have enough vitamin K in their bodies. If a bird has enough vitamin K then it is used in the formation of protein, which is then transported to the injured tissue, such as a broken blood feather. Vitamin K also assists in the strength and health of bone, organs and glands. Vitamin J increases the oxygen-carrying capacity of the blood.