Waardenburg syndrome. Waardenburg syndrome: Introduction. Waardenburg syndrome: The disease was named for Petrus Johannes Waardenburg, a Dutch ophthalmologist (1886-1979) who was the first to notice that people with two different colored eyes ... more about Waardenburg syndrome.
As a result, most of the fat-soluble vitamins (such as the vitamins A, D, E, and K) that contain amounts above the daily allowance are drug products. The daily dosage of a vitamin supplement for example cannot exceed 300% of the recommended daily allowance, and for vitamin A, this limit is even lower (200%).
Water-soluble vitamins include members of the B complex (thiamin, riboflavin, niacin, vitamin B6, folic acid, vitamin B12, pantothenic acid, biotin) and vitamin C. Most water-soluble vitamins support enzyme systems in the body but are excreted daily.