Stopping steroids does not automatically mean losing everything you gained. However, there is no reliable percentage that everyone will retain or lose. The claim that you will lose between one-third and two-thirds is too specific to present as a general rule.
Some changes in weight and muscle fullness may reflect reduced fluid retention rather than lost muscle tissue. Actual muscle retention depends on factors including training, nutrition, previous development, and hormonal recovery.
Keep resistance training consistent, but adjust the workload if recovery or strength declines. Avoid forcing the same training volume you managed while using steroids. Eat enough to support recovery, avoid aggressive dieting, and maintain adequate protein intake. The ISSN protein guidance supports combining resistance exercise with sufficient dietary protein to maintain muscle. pubmed.ncbi.nlm.nih.gov
Hormonal recovery also matters. Steroid use can suppress natural testosterone production, and recovery after stopping varies considerably. Persistent fatigue, low libido, or depressed mood should prompt medical assessment. Completing a PCT regimen does not, by itself, confirm recovery. PubMed
The explanation about permanently increased androgen receptors needs correction. Research has found differences in receptor expression between muscles and between groups of lifters, but that does not establish a permanent increase after stopping steroids or a guaranteed lifelong advantage. PubMed
Muscle memory may help with regaining previous size, but there is no established rule that everyone rebuilds muscle three times faster. Some human research has found higher myonuclear density in former steroid users. Myonuclei are different from androgen receptors, and those findings do not guarantee permanent retention of cycle gains. PubMed
The practical approach is consistent training, adequate food and sleep, and medically supervised recovery. Expect some changes in size and performance without assuming every drop on the scale represents lost muscle.