>>149797865 (OP)>The use of anabolic steroids has in an animal study been shown to givelong-term effects in skeletal muscle, by adding nuclei (DNA) to the muscle fibres and accelerating re-training. This means that the advantage of anabolic steroid use may be present in years after the athlete has stopped using the drugs.
https://www.wada-ama.org/en/resources/scientific-research/long-term-changes-human-skeletal-muscles-after-anabolic-steroid