Is testosterone replacement therapy (TRT) the same as taking steroids?

No, it is not. According to WebMD: “The difference is that doses used in testosterone replacement only achieve physiologic (NATURAL) levels of hormone in the blood. The testosterone forms some athletes use illegally are in much higher doses, and often combined (“stacked”) with other substances that boost the overall muscle-building (anabolic) effect.”

For a more in depth explanation: