I get this question almost daily from patients, and it’s a great one—so let’s clear up the confusion.
You’ve probably heard from a gym buddy or read somewhere that donating blood is a good way to manage your red blood cell count while on testosterone. But let’s set the record straight: therapeutic testosterone replacement therapy (TRT) isn’t about pushing levels to extremes. It’s about restoring testosterone to healthy, optimal levels—nothing more.
When testosterone is optimized, your body naturally produces more red blood cells. This is called secondary erythrocytosis, and despite how alarming it sounds, it’s actually a normal and expected response. More red blood cells improve oxygen delivery, which is one reason many men notice better energy, endurance, and overall stamina on TRT.
So where does blood donation come in?
Donating blood can lower red blood cell counts, but it also removes iron—specifically ferritin, the protein that stores iron in your body. And that part often gets overlooked.
The Iron Factor
If blood is donated too frequently, ferritin levels can drop too low. When that happens, men may feel fatigued, run-down, or notice a decline in exercise tolerance—even if their testosterone levels look fine on labs.
This is something I see regularly in clinical practice at Mason City Wellness, where men are often surprised to learn that feeling worse on testosterone isn’t always about testosterone at all—it’s about iron depletion.
Another important clarification: properly prescribed and monitored testosterone therapy does not increase the risk of blood clots. That concern has been overstated for years. When TRT is managed correctly, the focus is balance, not fear-based interventions.
How Often Should You Donate Blood?
If you enjoy donating blood, that’s a generous thing to do—and it doesn’t have to stop. It just needs to be done thoughtfully.
For most men on testosterone therapy, donating no more than twice per year is sufficient. This helps manage red blood cell levels without unnecessarily draining iron stores.
Here at Mason City Wellness, we initially monitor ferritin alongside other labs so decisions are guided by data—not internet advice or gym lore.
The Bottom Line
An increase in red blood cells on testosterone therapy is not a problem by default. It’s a normal physiologic response.
Blood donation can be helpful in certain cases, but donating too often can quietly create iron deficiency and leave you feeling worse instead of better.
Limit donations to about twice per year, monitor ferritin, and let labs and symptoms guide the plan—not blanket rules.
When testosterone therapy is done correctly, the goal is steady energy, mental clarity, and long-term health—not chasing numbers or unnecessary fixes.
Samantha Smith ARNP, NP-C