TRT Side Effects & Safety: What the Evidence Says
The real, evidence-based risks of TRT — polycythemia, fertility suppression, acne, and the updated cardiovascular picture — versus the myths.
Is TRT safe, and what are the actual side effects?
- •The most common real effects: elevated hematocrit, acne/oily skin, fluid retention, breast tenderness, and fertility suppression.
- •In 2025 the FDA removed the class-wide cardiovascular boxed warning after newer trial data; the picture is more reassuring than a decade ago, though monitoring still matters.
- •TRT does not 'cause' prostate cancer in current evidence, but PSA and prostate symptoms are monitored.
- •Polycythemia (thick blood) is the side effect most likely to require dose changes or a blood draw.
- •Risk is managed by correct dosing + monitoring, not by avoiding treatment in men who genuinely need it.
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Educational information, not medical advice. Testosterone-therapy decisions should be made with a qualified physician. Figures are typical ranges, not prescriptions.