Blog

Pharmacokinetics · Peptide math · TRT · GLP-1 protocols — every claim cited.

[Tool · Peptide math]

Peptide Reconstitution Calculator

Interactive. Enter your vial size and the dose you want per injection — it returns the exact bacteriostatic water volume to add, the concentration, and the units to draw. Includes a reference chart for common vial sizes.

· Free tool
[GLP-1]

How Long Does Tirzepatide (Mounjaro, Zepbound) Stay in Your System?

Tirzepatide half-life is about 5 days. What the Zepbound label says about peak time, steady state, missed doses and how long it takes to wear off after the last shot.

· 6 min read
[GLP-1]

How Long Do Saxenda, Wegovy, Victoza and Trulicity Stay in Your System?

Saxenda clears in days, Trulicity in weeks, Wegovy in 5 to 7 weeks. Half-life, peak time and missed-dose rules for each, straight from the FDA labels.

· 6 min read
[TRT · Tracking]

TRT Symptom Tracker: What to Log and How to Track Injections and Symptoms

What to log on TRT besides the shot itself: symptoms, lab timing and cycle day. Based on Endocrine Society monitoring guidance, plus how Dose Track keeps it in one place.

· 6 min read
[GLP-1 · Comparison]

Ozempic vs Mounjaro: Tirzepatide vs Semaglutide Compared (2026)

Head-to-head: half-life, weight loss in SURMOUNT-1 vs STEP-1 vs the SURMOUNT-5 head-to-head, side effects, dosing schedules, and 2026 cost. Cited from FDA labels and NEJM trials.

· 9 min read
[TRT · Bloodwork]

Estradiol (E2) on TRT: Symptoms, Testing, and Anastrozole Use

Why sensitive E2 (LC-MS/MS) is the right assay, the typical 20–40 pg/mL target, what high and low E2 actually feel like, and the cautious case for and against anastrozole on TRT.

· 9 min read
[Peptide · Pharmacology]

BPC-157: Dosage, Reconstitution, Pharmacology & 2026 Regulatory Status

Pentadecapeptide structure, acetate vs arginate salt forms, reconstitution math in insulin-syringe units, the real human evidence base, and the moving 2026 regulatory picture (HHS, FDA PCAC, WADA).

· 9 min read
[GLP-1 · Evidence]

GLP-1 Microdosing: What the Pharmacology and Trials Actually Show

An honest look at low-dose semaglutide and tirzepatide — what the trial data does and doesn't say, what the pharmacology supports, and the open questions that aren't yet answered.

· 8 min read
[Injection technique]

Injection Site Rotation: Why It Matters and How to Map It

Lipohypertrophy, scar tissue, and absorption drift — what happens when you keep hitting the same site, and a rotation map for SC and IM injections across TRT, GLP-1, and peptides.

· 8 min read
[Bloodwork]

Bloodwork 101: Total Testosterone vs Free Testosterone vs SHBG

Why a "normal" total testosterone result can still mean low free T, how SHBG distorts the picture, and the Vermeulen calculation your lab probably isn't running for you.

· 8 min read
[TRT]

TRT Steady State: When Do Testosterone Levels Stabilize?

Why testosterone cypionate takes 4–5 weeks to reach steady state, what your bloodwork actually shows after one shot, and how to time labs for an accurate trough.

· 8 min read
[GLP-1]

How Long Does Ozempic Stay in Your System? Semaglutide Half-Life Explained

Semaglutide has a 7-day half-life — meaning measurable plasma concentration weeks after stopping. What that means for missed doses, breaks, and switching protocols.

· 8 min read
[Peptide math]

How to Calculate Peptide Reconstitution: Insulin Syringe Units Explained

A clinician-grade walkthrough of the BAC water → mg/mL → insulin units math, with worked examples for BPC-157, Ipamorelin, HGH, and CJC-1295.

· 8 min read

More guides coming. Have a topic request? hello@dosetrack.app