Choline cobalamin vitamin

The major vitamins are described in separate alphabetical entries in tins book. Titles used for these entries have been selected on tlie basis of the most frequently used designations as of tlie early 1980s. In alphabetical order, the vitamins described in this book are Ascorbic Acid (Vitamin C) Biotin Choline and Cholinesterase Folic Acid Inositol Niacin Pantothenic Acid Vitamin Bj (Riboflavin) Thiamine (Vitamin Bj) Vitamin A Vitamin B (Pyridoxine) Vitamin B12 (Cobalamin) Vitamin D Vitamin E and Vitamin K. 

The B group vitamins and vitamin C serve as coenzymes or coenzyme precursors. The B complex includes thiamine, riboflavin, pyridoxine, niacin, pantothenic acid, biotin, folate, and cobalamin. Inositol, choline, and paraaminoben-zoic acid, usually classified as vitamin-like substances in humans, are sometimes included with the B-complex vitamins. They will be discussed briefly at the end of the chapter. The B vitamins occur in protein-rich foods... 

At the present time, 9 fractions of the vitamin B complex are generally recognized, and others are postulated. Those discussed in this book (alphabetically under their name designations) are biotin, choline, folacin (folic acid), niacin (nicotinic acid nicotinamide), pantothenic acid (vitamin B-3), riboflavin (vitamin B-21), thiamin (vitamin B-1), vitamin B-6 (pyridoxine, pyridoxal pyridoxamine), and vitamin B-12 (cobalamins). 

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