The drug can be used as a masking agent to cover up steroid use. It basically kicks your body back into making testosterone.

From ESPN:
"...two people with knowledge of the case told ESPN's Mark Fainaru-Wada and T.J. Quinn. The sources said that in addition to the artificial testosterone, Ramirez was identified as using the female fertility drug human chorionic gonadotropin, or hCG."

And later in the article:
"ESPN reported earlier that testing showed Ramirez had used hCG, which is typically used by steroid users to restart their bodies' natural testosterone production as they come off a steroid cycle. It is similar to Clomid, the drug Barry Bonds, Jason Giambi and others used as clients of BALCO."

http://sports.espn.go.com/mlb/news/story?id=4148907

Here is some more information about hCG:
http://en.wikipedia.org/wiki/Human_chorionic_gonadotropin

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