Word: provitamine
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...could be kept in storage without losing its power. Vitamin C is mainly to be found in fruit, vegetables or fresh milk from cows that have been grazing in the open. In my experiments I used the juice of oranges. ... In the unripe oranges I found the so-called provitamin -that is, the product which, when the fruit ripens, develops into the vitamin. I found that it was identical with what the chemists call narkotin. . . . Having arrived at this conclusion, my next task was to find a mechanical process to deal with narkotin, which proved to be very difficult...
...Liver Oil & Ergosterol. In cod-liver oil, is a substance which contains Vitamin D and which helps both to prevent and cure rickets (bone disease). That substance (provitamin) acts like a solid alcohol (sterol) and is believed to be ergosterol. If ergosterol is exposed to certain wave lengths of ultraviolet light for certain periods the potency of this provitamin is increased so powerfully that, for treating rickets, one ounce of it is as good as six tons of cod-liver oil.-Dr. Alfred Fabian Hess of Manhattan...
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