The label update did not turn testosterone into a general-purpose energy or longevity drug. Testosterone products remain approved only for men with low testosterone caused by an associated medical condition (hypogonadism), and the FDA kept the "limitation of use" language noting that the benefit of treating age-related low testosterone on its own hasn't been established.
That's why proper diagnosis matters. Legitimate TRT starts with lab work — typically two early-morning testosterone levels — plus a review of symptoms such as low libido, erectile difficulties, fatigue, and loss of muscle mass. Screening should also cover the things that make TRT a bad fit: untreated prostate or breast cancer, plans for near-term fertility (TRT suppresses sperm production), severe untreated sleep apnea, and very high red blood cell counts. Once treatment starts, good care includes periodic monitoring of testosterone levels, hematocrit, blood pressure, and prostate health. Common side effects can include acne, fluid retention, and the blood pressure and red-blood-cell effects now flagged on the label.
Low testosterone also travels with other men's health issues — erectile dysfunction in particular. If ED is part of the picture, treating both sides often works better than either alone; you can read about prescription options like sildenafil and tadalafil on our sexual health page.