Residual T in system?

I've noticed that my total and free drop pretty drastically if I skip a week of pinning (cypionate). They'll go from 1200 to <500. Yet the last time I came off trt, some symptoms of low T didn't start until six-weeks-off at which time they hit me hard.

Unfortunately I didn't test my levels for another few weeks by which time I'd started producing naturally again, so I don't know exactly where my levels sat at week six. I can understand that the drop-rate might not be constant, but if I dropped 700 points by missing one week, wouldn't it stand to reason that I would drop another few hundred points by week six? Or no?

Does the drop-rate indeed slow down so much that my levels could've still been half-decent as I approached week six, or is there some kind of phenomena with synthetic T where it stays in your system in a way that doesn't show on lab tests? Or was I just in some kind of placebo mode?
 

hCG Mixing Calculator

HCG Mixing Protocol Calculator

TRT Hormone Predictor Widget

TRT Hormone Predictor

Predict estradiol, DHT, and free testosterone levels based on total testosterone

⚠️ Medical Disclaimer

This tool provides predictions based on statistical models and should NOT replace professional medical advice. Always consult with your healthcare provider before making any changes to your TRT protocol.

ℹ️ Input Parameters

Normal range: 300-1000 ng/dL

Predicted Hormone Levels

Enter your total testosterone value to see predictions

Results will appear here after calculation

Understanding Your Hormones

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.

DHT

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

Free Testosterone

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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