One effective use of corticosteroid injections is as a post-operative treatment. A forum member detailed how, after their gynecomastia surgery, one nipple began to protrude. They were concerned about leftover tissue, but their surgeon identified it as possible scar tissue or swelling. The surgeon administered a Kenalog (steroid) injection. While the nipple flattened for a few days before becoming puffy again, it illustrated how injections can be a first-line, non-surgical attempt to correct post-surgical issues before considering a revision surgery.
If you are looking to improve your physique or performance, it is much safer to stick to lab-tested oral supplements (like Creatine) and a structured training program. If you feel you have a hormonal deficiency, the only "real" and safe path is a blood test through a licensed endocrinologist performance-enhancing alternatives, or were you researching how to treat gynecomastia
Always opt for treatments and products from reputable sources. If a product or treatment seems too good to be true or is heavily promoted online without professional endorsement, it's best to approach with caution.
However, . Doctors use off-label injectable forms of drugs originally meant for breast cancer or fertility.