MLB suspended Marlon Byrd 162 games for his second PED violation. Byrd is not appealing the suspension:

“Since that time, I have paid close attention to the substances that are banned by the Joint Drug Agreement, as I had no intention of taking any banned substances. I relied upon a medical professional for assistance and advice with respect to the supplements that I was taking. However, certain supplements I was taking were not on the NSF Certified for Sport list, and therefore, I assumed certain risks in taking them.

“When I learned that I had tested positive for Ipamorelin, I retained the services of private counsel and an independent chemist to determine the origin of the Ipamorelin test result because I never knowingly ingested Ipamorelin. After an extensive investigation by my lawyers and an independent chemist, it was concluded that the most likely source of Ipamorelin was a tainted supplement.

“I alone am responsible for what I put in my body, and therefore, I have decided for forgo my right to an appeal in this matter and accept the suspension. I apologize for any harm this has caused the Cleveland Indians, Indians’ fans, my teammates, and most importantly, my family.”

So there is certified list, but a player is going to risk his career going off certification? Sure. More likely because Byrd is 38, his career is close to over, so he probably figured the risk of getting caught was worth it.