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I thought you'd enjoy this article by Lara Pizzorno, MDiv, MA, LMT on Longevity Medicine Review:

http://www.lmreview.com/articles/view/vitamin-a-tolerance-extends-longevity

Vitamin A is a family of essential fat-soluble dietary compounds, three of which—retinol, retinal and retinoic acid—play significant roles in the human body, with each compound performing functions the others cannot. Retinol is the major transport and storage form of vitamin A; retinal is essential for vision, and retinoic acid acts like a hormone, binding to nuclear-hormone receptors and affecting the expression of more than 500 genes. Vitamin A is required for vision, immune function, skin health, regulation of cell growth and bone metabolism, thus symptoms of vitamin A insufficiency include night blindness; increased susceptibility to infection and loss of immune tolerance (environmental and food allergies, autoimmune diseases); hyperkeratosis, dry skin, brittle nails, hair loss; epithelial cancers and bone loss. 

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Lara Pizzorno is a member of the American Medical Writers Association with 25+ years of experience writing for physicians and the public, Lara is Editor for Longevity Medicine Review as well as Senior Medical Editor for SaluGenecists, Inc. Read more...

Lara Pizzorno, MDiv, MA, LMT

John Morgenthaler has been active in the field of nutritional medicine since 1986. Today, John travels the world looking for breakthrough nutraceuticals and anti-aging therapies. He also continues to publish cutting-edge nutrition and medical science books and periodicals. Read more...

John Morgenthaler, Publisher

Longevity Medicine Review - Analyzing the latest research in longevity science

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