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TRT (Testosterone Replacement Therapy)Small moleculeNo amino acid sequence. Icon reflects category theme only.TRT (Testosterone Replacement Therapy) Dosage Calculator
Testosterone Replacement Therapy (TRT) is the medical use of exogenous testosterone to restore serum levels in men diagnosed with hypogonadism — defined as total testosterone consistently below 300 ng/dL on two separate morning blood draws.
80mcg · Weekly
Summary: Add 0mL BAC water to your 10mg vial. Draw to < 0.1 units on a U-100 syringe for a 80mcg dose. This vial will last 0 doses.
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TRT (Testosterone Replacement Therapy) Pharmacokinetics
Pharmacokinetics — Active Dose Over Time
t½ = ~8 days (testosterone cypionate IM)Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.
TRT (Testosterone Replacement Therapy) Dosing Protocol
| Level | Dose / Injection | Frequency |
|---|---|---|
| Beginner | 80mg | Weekly |
| Moderate | 75mg | 2x/week |
| Aggressive | 100mg | 2x/week |
Note: TRT isn't a peptide — it's exogenous testosterone, but it's commonly stacked with peptides like gonadorelin or HCG for fertility preservation. Testosterone cypionate and enanthate are the two most common injectable esters. Always get baseline bloodwork before starting: total testosterone, free testosterone, estradiol, SHBG, CBC with hematocrit, PSA, and a lipid panel. Recheck labs at 6 weeks, 3 months, 6 months, then every 6-12 months. Splitting your weekly dose into 2 injections (every 3.5 days) produces more stable blood levels and reduces estrogen spikes. Aromatase inhibitors like anastrozole should only be used if estradiol climbs above 40-50 pg/mL with symptoms — don't crash your estrogen.
About TRT (Testosterone Replacement Therapy)
Testosterone Replacement Therapy (TRT) is the medical use of exogenous testosterone to restore serum levels in men diagnosed with hypogonadism — defined as total testosterone consistently below 300 ng/dL on two separate morning blood draws. The FDA approved testosterone cypionate (Depo-Testosterone) for this indication decades ago, and it remains the most widely prescribed injectable form in the United States. Testosterone enanthate is equally effective with a nearly identical pharmacokinetic profile. TRT is prescribed when the body can't produce enough testosterone on its own, whether from primary testicular failure, pituitary dysfunction, aging-related decline, or prior use of anabolic steroids that suppressed the HPTA. Symptoms of low testosterone include fatigue, reduced libido, erectile dysfunction, loss of muscle mass, increased body fat, depressed mood, and poor concentration. Injectable testosterone cypionate comes in 10 mL multi-dose vials at 200 mg/mL concentration. It's an oil-based solution (typically in cottonseed or grapeseed oil) injected intramuscularly or subcutaneously. Unlike peptides, there's no reconstitution required — you draw directly from the vial. The 2023 TRAVERSE trial (n=5,246) established cardiovascular safety in men with pre-existing CV risk, finding testosterone was noninferior to placebo for major adverse cardiac events (HR 0.96, 95% CI 0.78-1.17). This was a landmark result that resolved years of debate about cardiac safety. TRT requires ongoing monitoring. Hematocrit must be checked regularly — if it exceeds 54%, dose reduction or therapeutic phlebotomy is needed. PSA should be tracked for prostate safety. Estradiol management matters because testosterone aromatizes to estrogen, which can cause water retention, gynecomastia, and mood changes if levels climb too high.