Anthony Bosch, founder of former South Florida anti-aging clinic Biogenesis, said in an interview with "60 Minutes" that New York Yankees third baseman Alex Rodriguez was meticulous about his use of performance-enhancing drugs.
Bosch also said he injected drugs into Rodriguez.
The interview aired Sunday night.
Rodriguez's 211-game suspension, handed down Major League Baseball for his connection to Biogenesis, was shortened to 162 games by an arbitrator Saturday.
The interview, as well as text messages between Bosch and Rodriguez, indicate that Rodriguez was obsessed with using PEDs to help him try to become the only major-leaguer to reach 800 home runs. He has 654 homers.
Bosch injected drugs into Rodriguez because he was "scared of needles."
"So at times, he would ask me to inject," Bosch said.
Bosch described Rodriguez as secretive and himself as accommodating.
"Try to use service elevators. Careful. Tons of eyes," Rodriguez wrote to Bosch in a text message in June 2012 in Atlanta.
Bosch said in the interview that Rodriguez paid $12,000 per month for PEDs from Bosch.
"Alex cared. Alex wanted to know," Bosch said. "He would study the product. He would study the substances. He would study the dosages, because he wanted to achieve all his human performance or in this case, sports performance, objectives. And the most important one was the 800 home run club."
Rodriguez sent Bosch a text during a spring training game in April 2012 after he had three RBIs.
"Really good. Explosive," Rodriguez wrote.
"Go with same protocol," Bosch replied.
Bosch's televised appearance drew an angry response from the Major League Baseball Players Association, which issued a statement that read in part, "It is unfortunate that Major League Baseball apparently lacks faith in the integrity and finality of the arbitrator's decision and our Joint Drug Agreement, such that it could not resist the temptation to publicly pile-on against Alex Rodriguez. It is equally troubling that the MLB-appointed Panel Arbitrator will himself be appearing in the '60 Minutes' segment, and that Tony Bosch, MLB's principal witness, is appearing on the program with MLB's blessing."
MLB replied in a statement that read in part, "Out of respect to the grievance process and at the request of the MLBPA, we waited until a decision was rendered to make our response.
"It is ironic that the MLBPA is complaining about MLB's participation in this ('60 Minutes') program given that Mr. Rodriguez's lawyer is also participating in the show.
"As to Mr. Bosch's appearance, he is not controlled by us and is entitled to speak however he chooses about his interactions with Mr. Rodriguez."
Bosch spokeswoman Joyce Fitzpatrick said in a statement that Bosch believes Rodriguez's suspension is fair and deserved.
"Tony Bosch doesn't take joy in seeing Alex Rodriguez suspended from baseball, but he believes the arbitrator's decision was appropriate," she said Saturday. "He is glad to have the arbitration behind him and believes he can play a valuable role in the future by educating athletes about the dangers of performance-enhancing drugs."