The Correct Way To Dose + Monitor TRT (Labs Explained)

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How To Titrate A TRT Dose Without Guessing

Most people start testosterone at whatever number the clinic hands them, wait a few weeks, feel something, and then never adjust again. The dose becomes permanent by accident.

The better way is to treat the first dose as a starting position and let your bloodwork tell you where to go from there.

Before the numbers, understand the chain. Testosterone goes in, some of it converts to estradiol through an enzyme called aromatase, which is the protein that turns androgens into estrogens, and that estradiol is doing real work in your body on bone, brain, joints, and libido. Estrogen production in men depends almost entirely on this conversion rather than direct secretion, which is why your E2 rises when your testosterone rises (Burger, Horm Res 2001). Aromatase itself sits in fat tissue, muscle, brain, and bone, so the more of you there is, the more conversion you get (Karaer et al., Acta Obstet Gynecol Scand 2004).

That relationship is the whole reason E2 becomes your ceiling marker.

Now what's going to happen is is when you add that testosterone you're going to see a meaningful increase of estradiol E2 and Hopefully IGF-1 and so what you'll do is you'll start with something like 125 milligrams a week Run that for four to six weeks do another set of labs at your trough meaning the low instead of the peak Okay midway point between your injections and then evaluate where E2 is Where your testosterone is where your IGF-1 levels are where your GGT is your liver health Don't do AST and ALT because they will be elevated if you're lifting in the gym Okay, and then of course get your HDL and your LDL if your testosterone levels are elevated you feel good you're performing well and Your E2 is still below that reference range and that means you have room to go up So what you'll do is then after that evaluation period you'll increase your dose by 10 to 25 milligrams per week and then do it again

Take that apart piece by piece.

Four to six weeks is not arbitrary. Testosterone cypionate and enanthate take roughly five half-lives to reach a stable blood level, and with a weekly injection schedule that lands you around the four to six week mark. Test earlier and you are measuring a system still climbing toward its plateau, which means you will read a low number and chase it with a dose increase you did not need.

Trough is the same logic applied to a single week. Your level right after an injection is the highest it will be, and if you dose that peak you are titrating against a number your body only sees for a day or two. The midpoint between injections is the closest thing to your real baseline.

On liver markers, the AST and ALT point is the one people fight me on. Both enzymes exist in skeletal muscle, not just liver, so heavy training releases them into the blood and the panel comes back looking like liver damage when nothing is wrong. Researchers looking at bodybuilders found exactly this pattern, with AST and ALT elevated while liver-specific markers stayed normal, which pointed to muscle as the source rather than the liver (Dickerman et al., Clin J Sport Med 1999). GGT is the marker I use instead, though I want to be clear that I have never seen a study run head to head on GGT specifically in men on testosterone. That is my clinical preference, not a literature finding.

Same honesty on IGF-1 and the lipid panel. I track both because I have watched them move on clients and they tell me something useful about how a dose is landing, but the research on testosterone driving IGF-1 up is not something I can point you to, and the cholesterol monitoring is a habit built from practice rather than a trial.

Research: Burger HG, Horm Res 2001; Karaer O et al., Acta Obstet Gynecol Scand 2004; Dickerman RD et al., Clin J Sport Med 1999.

References:

Karaer O, Oruç S, Koyuncu FM. Aromatase inhibitors: possible future applications. Acta Obstet Gynecol Scand. 2004. https://pubmed.ncbi.nlm.nih.gov/15255840/

Burger HG. Physiological principles of endocrine replacement: estrogen. Horm Res. 2001. https://pubmed.ncbi.nlm.nih.gov/11786692/

Dickerman RD, Pertusi RM, Zachariah NY et al.. Anabolic steroid-induced hepatotoxicity: is it overstated? Clin J Sport Med. 1999. https://pubmed.ncbi.nlm.nih.gov/10336050/