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He was involved in the discovery of the transformation of cholesterol through several steps to George Sperti
His invention of an Ultraviolet "Vitamin D" lamp for irradiating milk was sold to General Foods for $300,000.
However absorption of a certain amount of UV radiation is necessary for the production of certain vitamins, notably vitamin D (see also Osteomalacia).
Her early research was dedicated towards the understanding of Vitamin D; she also jointly published the first article describing the breeding characteristics of the golden hamster.
Dr. Sorenson has published a scientific paper in the journal Dermatoendocrinology, on Vitamin D and erectile dysfunction (ED), theorizing that lack of vitamin D or sunlight could be a contributor to ED.
Nutritional immunology researchers have discovered novel mechanisms by which naturally occurring compounds such as conjugated linoleic acid, abscisic acid, n-3 polyunsaturated fatty acids, resveratrol, curcumin, limonin, Vitamin E, Vitamin A, and Vitamin D modulate immune responses.
Calbindin-D9k (S100G) is found in mammalian intestine and calbindin-D28k is in avian intestine and in mammalian kidney and other tissues.
A majority of WARF's income, around 70%, comes from Vitamin D.