injection basics

  1. K

    Subcutaneous Test C - Supplies

    So I’m starting my first cycle of TRT and I will be injecting subcutaneously EOD. I understand some people use insulin needles, I’m not super comfortable with the idea of drawing and injecting with the same needle. I’ve been looking for 0.5ml lure lock needles but haven’t found any. I’m...
  2. B

    UNABLE TO DRAW TRT FROm VIAL

    Strange experience the other day. I could not get the syringe to fill. Never had this happen. NEw vial of TRT new needle. Thoughts..... it seemed like it was really thick or something.
  3. S

    Injection...

    Is there a difference if injected intermuscular or sublingual?
  4. R

    Here's an easy way how to get the last drops out of the vial

    Here's good advice if you want to get the last 5-10 units from the vial without them going to waste. Remember as she says this should only be done when you're done the whole bottle . To open the bottle early you'll risk serious contamination and infection.
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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