I've suffered very low test levels (well below reference range minimum) for a long time, due to being in SSRI meds for anxiety. Those meds do their jobs but crushed my test levels. Symptoms included lots of belly fat and man boobs (put on 30lbs in 2 years despite regular exercise), but the major issues were all psychological; low mood, low self esteem, no drive to do stuff.
Finally got on TRT and it's turned everything upside down in the best possible way. I'm more assertive, but calmer, less anxious but also willing to tackle issues. Way more drive and motivation to do stuff. Horny like a teenager. Belly fat is melting away and exercise is showing incredibly fast results. I'm so incredibly motivated to work out because I can literally see progress in the mirror on a weekly basis.
I do this all under doctors supervision (using a well known trt clinic in London), and have had no negative biomarker results, in fact quite the opposite, my lipids have gone from "you need help" to optimal. Even managed to knock up the wife. (I'm on HCG as well to maintain fertility).
Guys, get your hormones checked. It will transform your life.