Forty-six-year-old Jonathan Imler, of Williamsburg, was charged and jailed in Blair County on Tuesday.
Police say the girl's 16-year-old boyfriend, who is the father of the child, another 17-year-old boy and Imler stole the hormone ProstaMate from a farm. The 17-year-old allegedly put a drop of it in the girl's Gatorade in March 2008.
The girl's mother has said a friend told her daughter about the drink's contents later that day.
Police say they plan to charge the boys.
The girl has since given birth. Her mother says the hormone apparently didn't harm the baby.
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Information from: Altoona Mirror, http://www.altoonamirror.com