Testosterone gel 1% is a transdermal androgen replacement for male hypogonadism that restores physiologic testosterone levels and improves androgen‑deficiency symptoms through steady 24‑hour systemic absorption from the skin reservoir. About 9–10% of applied testosterone is absorbed, with serum levels rising within 30 minutes and reaching steady state by day 2–3 of daily use. Application is to clean, dry shoulders/upper arms or abdomen with hand‑washing afterward; cover once dry, avoid transfer to others, and wash or cover the site before close contact. Periodic labs and clinical follow‑up guide ongoing therapy.