This is expected
[DOI] [PubMed] [Google Scholar] 69.Salven P, Lymboussaki A, Heikkil P, Jskela-Saari H, Enholm B, Aase K, et al
During a subcutaneous injection, a short needle is used to inject a drug into the fatty tissue layer between the skin and the muscle, usually in specific areas of the thigh, arm, and abdomen
After injection, withdraw the needle smoothly, apply gentle pressure with cotton wool, and immediately dispose of the needle in a sharps container without recapping
Some of that testosterone converts to estradiol through aromatase activity
Advanced research protocols also track NAD+ levels via blood assay, respiratory exchange ratio (RER) during exercise to measure substrate utilization, and adiponectin levels as a marker of metabolic health