USA Today story published a story Wednesday calling Braun "MLB's Public Enemy No. 1" in its investigation of Biogenesis.
Biogenesis is an anti-aging clinic alleged to have sold performance-enhancing drugs to baseball players. Braun's and numerous other baseball players names appeared on the log books of clinic operator Anthony Bosch.
"Everyone whose name has surfaced surrounding the Miami New Times story and Biogenesis is being investigated with equal vigor," Major League Baseball executive vice president Rob Manfred said in a statement to the Milwaukee Journal Sentinel.
Braun said he contacted Bosch to be a consultant in his appeal of a positive drug test for elevated testosterone levels in the winter of 2011-12 and never paid Bosch for performance-enhancing drugs.
"I'm extremely confident and secure in who I am and how I live my life," Braun told USA TODAY. "I will never allow anyone or anything to get me down or change that. I've always tried to do everything right in life and I'm proud of what I've accomplished. You get to the point where you almost don't care what people think. But anybody that knows me and who has ever known me knows who I am. They know the way I live my life. They know I'm a good person."