Vitamin A
The Complete Idiot's Guide to Vitamins and Minerals
Vitamin A Guide
Updated and revised for the first time since 2000, this new edition of The Complete Idiot's Guide to Vitamins and Minerals covers all the latest research and developments in vitamins, minerals, and supplements in the last six years. It features significant new information on Vitamins A and E, folate, and glycosamine, among many others, and sets the record straight on much of the conflicting information out there on this subject.
--Covers all research and developments in vitamins, minerals, and supplements in the last six years
--Significant new information on Vitamin A and Vitamin E, folate, glycosamine, and others
For anyone interested in health and nutrition, this guide provides up-to-date information. It explores the functions, benefits, and risks of each essential vitamin and mineral, and gives accurate information about the hottest supplements, including antioxidants, DHEA, and melatonin. The book also points out which drugs and foods may block the body's absorption of important nutrients.
The Complete Idiot's Guide to Vitamins and Minerals, 3rd Edition
Anyone interested in learning about nutritional supplements should read this book! It covers all of the basics about supplements, why we need them, and what benefits they can provide us with for optimum health. You'll see all of the popular vitamins, minerals, herbs and antioxidants and a whole lot more. I strongly recommend "The Complete Idiot's Guide to Vitamins and Minerals" to anyone that has wanted to learn more about supplements, but didn't know where to find reliable information.
This book helped me to get seriously involved in the nutritional supplement field, and I make sure that I keep a copy of it readily available at all times! - Wayne Wasserman (Florham Park, New Jersey United States)
A Complete and Handy Reference Guide
Part 1: The Vital Keys to Good Health
Part 2: The A to K of Vitamins
Part 3: Minerals: The Elements of Good Health
Part 4: Exploring Other Supplements
Appendix A: A quick reference chart for common health problems such as acne, colds and insomia
Appendix B: Resources (includes addresses and phone number of that company/organization) for Finding nutritionally oriented physicians and other health care professionals in your location, Nutrition and the elderly, Testing labs, Supplement manufacturers, Supplement infomation and regulation, Federal Regulation and Industry association & help for medical problems
Appendix C: Includes a in-depth glossary of the terms throughout the book.
This book is packed with infomation and I found this book very useful.
In its introduction, the author explains briefly on why vitamins and minerals are so important for us to stay alive. Throughout the book there are plenty of charts, including many that list good food sources for the various vitamins, minerals, and other supplements. The book also gives tips on how to get the most from your foods and supplememnts, how to avoid problems like overdoses or bad interactions with other drugs or supplements. It also includes a sidebar with a duck character letting you know what supplements don't work or what to avoid because it dosen't work. - catdogkidsfirst (USA)
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Vitamin A
Vitamin A, a bi-polar molecule formed with bi-polar covalent bonds between carbon and hydrogen, is linked to a family of similarly shaped molecules, the retinoids, which complete the remainder of the vitamin sequence. Its important part is the retinyl group, which can be found in several forms. In foods of animal origin, the major form of vitamin A is an ester, primarily retinyl palmitate, which is converted to an alcohol (retinol) in the small intestine. Vitamin A can also exist as an aldehyde (retinal), or as an acid (retinoic acid). Precursors to the vitamin (provitamins) are present in foods of plant origin as some of the members of the carotenoid family of compounds. Carolyn Berdanier. 1997. Advanced Nutrition Micronutrients. pp 22-39
All forms of vitamin A have a beta-ionone ring to which an isoprenoid chain is attached. This structure is essential for vitamin activity. The orange pigment of carrots - beta-carotene - can be represented as two connected retinyl groups, which are used in the body to contribute to Vitamin A levels. The retinyl group, when attached to a specific protein, is the only primary light absorber in visual perception, and the compound name is related to the retina of the eye.
Vitamin A can be found in various forms:
*retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble, vitamin with importance in vision and bone growth. Since the alcohol form is unstable, the vitamin is usually produced and administered in a form of retinyl acetate or palmitate.
*other retinoids, a class of chemical compounds that are related chemically to vitamin A, are used in medicine. American Cancer Society: Retinoid Therapy
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