Alex Rodriguez was granted an exemption by Major League Baseball to use testosterone prior to his 2007 MVP season, according to a new book.

The book, "Blood Sport: Alex Rodriguez, Biogenesis and the Quest to End Baseball's Steroid Era" by Tim Elfrink and Gus Garcia-Roberts outlines that Rodriguez was granted a therapeutic use exemption in order to treat hypogonadism (a testosterone deficiency), a rarity in the sport.

"In 2007, of the 1,354 players subjected to testing, 111 were granted a TUE," according to the book. "Only two, apparently including Rodriguez, received an exemption for 'androgen deficiency medications,' the category that would include testosterone."

Rodriguez went on to win his third MVP award in 2007 after hitting 54 home runs and driving in 156 runs (both MLB highs) with a .314 average.