Medication cause of Braun's positive test: Report By QMI Agency

Brewers outfielder Ryan Braun reacts after an out against the Mets at Citi Field in New York, N.Y., Aug. 21, 2011. (JIM McISAAC/Getty Images/AFP)

Medication used for a "private issue" caused National League MVP Ryan Braun's failed drug test a source told TMZ on Monday.

The announcement of the failed drug test came Dec. 10, although Braun indicated he was aware of it in late October.

Braun, who reportedly won't say what the medication is for, tested for elevated levels of testosterone.

Braun's spokesman said the results were "highly unusual" and said the slugger was confident he would be cleared of taking performance-enhancers.

Braun hit .332 with 33 homers and 111 RBI, finishing first in the NL in slugging percentage, .597, and on-base plus slugging percentage, .994.

The 28-year-old faces a 50-game suspension if the ban is upheld.