Ive been on TRT for 5 years. I stabilized once I stopped donating blood and doing the Yo Yo of Ferritin, Iron, T levels, Hema and Hemo. My levels are pretty consistent at 18 hemo and 52 for hema the past 1.5 years. I stopped donating about 1.5 years ago. My testosterone level is always in the 500-600 range. I watch platelets..which are always at the middle of the range. Unscientific observation: I think where people run into more occurrences of issues is when they try to push T levels into the 900+ range from what Ive seen. Im a 49 year old male, exercise 4-5 days per week, mostly cardio.