Switching from injections to Kyzatrex - residual T and labs timing?

Vman

Member
As the title states, I am switching from 12mg T cypionate subq daily injections to Kyzatrex oral testosterone (I plan on detailing my journey in another thread when I have labs to share). I stopped my injections today and will not start taking Kyzatrex for a week. I have some questions about how much T from my cypionate injections will show up in my labs. Specifically,

1. Does anyone know what percentage of my T cyp injections dosage will still be in my system at 3 weeks and 4 weeks?
2. How long until the T from the injections is completely out of my system?
3. How many hours post Kyzatrex dose should I take my labs for the most accurate peak?

I am concerned because my doctor will titrate my Kyzatrex dose based off my labs and I want to make sure my labs are not still drastically inflated from my T cyp injections. I have my information from my doctor, but I know there are some extremely well informed people on these forums so I thought I'd ask here as well. Thanks in advance for your help!
 
I stopped my injections today and will not start taking Kyzatrex for a week.
Oral testosterone ambassador here. That’s not really necessary, there’s no reason to wait to start Kyzatrex.

You will reach steady states in seven days on oral testosterone.

How long until the T from the injections is completely out of my system?
It took 4 1/2 weeks for the testosterone cypionate to wash out of my system and for my HPTA to become functional again.

How many hours post Kyzatrex dose should I take my labs for the most accurate peak?
Four to six hours. You really want to aim for midpoint, so 6 hours.
 
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Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

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Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

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The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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