These nutrients are taken from the bird's body. A. Well, remember again your birds are consuming isolated synthesized nutrients and not complex whole nutrients when you feed a synthetic supplement or feed. Anytime you take large doses of a synthetic nutrient it creates imbalances. This is because they are chemicals, not the real thing. However, if you use the synthetic form of vitamin E, dl tocopherol, this will decalcify bones.
Alpha tocopherol is the natural form and most biologically effective.
The vitamin G portion is the component of the vitamin that has vasodilative effects. It relaxes the mind and body. The B portion of the vitamin constricts and causes tension. Often those products that contain vitamin B have a long list of milligrams behind each nutrient in the B complex. This indicates that the product was made in a lab.