Are Low T3 and T4 Levels Normal on TRT? (TRT Q&As)
Timeline
The caller says his T3 and T4 have been low while using testosterone and after experimenting with a steroid cycle. Dr. O’Connor explains that thyroid function should be evaluated with the full picture, especially TSH, rather than interpreting T3 and T4 in isolation, and recommends working with a physician to investigate the abnormal values.
The caller is concerned about creatinine around 1.4 to 1.5 and eGFR readings in the 50s while taking 10 grams of creatine daily. Dr. O’Connor explains that creatine supplementation can raise serum creatinine and make creatinine-based eGFR appear falsely low, and suggests temporarily stopping creatine, hydrating, repeating the test, and checking cystatin C for additional clarification.
The caller asks about using one to two IU of growth hormone every other day. Dr. O’Connor says there is no strong evidence that this approach extends lifespan, discusses the limited anabolic effects and potential side effects of growth hormone, and emphasizes that benefits and risks depend heavily on dose and the individual.
The caller says he recently began experimenting with a small dose of retatrutide and asks whether Dr. O’Connor has experience with it. Dr. O’Connor discusses having seen patients use it, but emphasizes that these newer compounds require caution because long-term experience and safety data remain limited.
A new TRT patient notices testicular shrinkage and weaker erections after initially feeling strong effects from treatment. Dr. O’Connor explains that testosterone cypionate can take roughly six weeks to reach steady state and advises against increasing the dose too quickly, since symptoms, sexual function, medications, and hormone levels need time to stabilize.
The caller asks about adding peptides and other compounds to improve mental health. Dr. O’Connor urges him not to move too quickly, especially with a history of anxiety, and recommends prioritizing stability and working closely with his clinician rather than rapidly adding multiple growth factors, secretagogues, or other experimental compounds.
Video Summary
This session focuses on patient-submitted questions related to testosterone therapy, metabolic health, and symptom interpretation, with discussion framed around general clinical principles rather than individualized medical guidance. The conversation emphasizes common areas of confusion patients experience when reviewing laboratory values, symptoms, and treatment expectations, particularly in the context of hormone optimization and chronic health conditions.
Key discussion points include how testosterone levels should be interpreted alongside clinical symptoms rather than in isolation, and why single laboratory values are insufficient to define health status or treatment success. The importance of trend analysis, contextual factors such as sleep, nutrition, stress, and comorbid conditions, and appropriate monitoring intervals is reinforced throughout the session.
The session also addresses common misconceptions around testosterone therapy, including expectations of rapid symptom resolution, dose escalation, and the meaning of “normal” laboratory ranges. The clinician highlights the risks of overcorrection and the need to balance symptom improvement with physiologic safety, reinforcing that more aggressive intervention does not necessarily translate to better outcomes.
Overall, the discussion underscores the value of individualized evaluation, careful monitoring, and collaboration with qualified clinicians when navigating testosterone and metabolic health concerns. The session is educational in nature and intended to support informed discussions between patients and their healthcare providers rather than replace professional medical care.
Drug Callouts
Condition Callouts
Key Takeaways
- You're is interpreted using repeated patterns rather than isolated moments.
- Don't descriptions help guide follow-up context.
- Gonna concerns benefit from clear, consistent reporting.
- Tracking right supports more informed interpretation.
- Clear communication about they're improves future visits.