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New RCT: Vitamin D beneficial for increasing muscle fiber size

Posted on: January 2, 2014   by  John Cannell, MD


In my 2008 book, Athletes Edge; Faster, Quicker, Stronger with vitamin D, I reviewed studies showing vitamin D affects muscle tissue. Several earlier studies suggest vitamin D increases the size of muscle fibers, especially the type II, fast twitch, type of fiber. Type II fibers are thought to contribute most to muscle strength.

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