Where do the half-life values come from?

Published pharmacokinetic literature (e.g. Behre & Nieschlag, Comparative Pharmacokinetics of Testosterone Esters, 1998) and PubChem molecular-weight data. They are population estimates — individual variation is significant.

Why does Sustanon 250 show four curves?

Sustanon is a blend of four testosterone esters (propionate, phenylpropionate, isocaproate, decanoate), each releasing at a different rate. The plotter models each ester independently and sums them for the total.

What does active fraction mean?

The ester adds molecular weight to the parent hormone. 250 mg of testosterone enanthate contains about 180 mg of the parent hormone — the rest is the ester group.

Is this a dosing recommendation?

No. It is a mathematical model for planning research protocols and understanding ester kinetics. Vyroval does not provide dosing guidance.

12-week serum level curve

Laboratory Tools

Ester Half-Life Plotter

Plot estimated active-compound levels across a 12-week protocol for testosterone, nandrolone, trenbolone and other esters.

Model the curve, plan the protocol.

Every ester releases active compound at its own rate. Plot a simplified 12-week first-order pharmacokinetic model for any ester in the Vyroval catalog, or open Sustanon 250 to see its four-ester blend decompose into individual release curves.

Modelled remaining fraction — 12 weeks

first-order PK model · estimates only

Reference ester data

Compound	Est. half-life	Active fraction
Testosterone Enanthate	4.5 days	72%
Testosterone Cypionate	8 days	70%
Sustanon 250 (blend)	8 days	69%
Trenbolone Acetate	2 days	87%
Nandrolone Decanoate	15 days	64%
Boldenone Undecylenate	14 days	63%
Drostanolone Propionate	4.5 days	84%
Methenolone Enanthate	10 days	73%
Stanozolol (oral)	0.5 days	100%
Oxandrolone (oral)	0.5 days	100%
Methandrostenolone (oral)	0.5 days	100%
Sustanon 250 — Propionate	2 days	86% · 30 mg
Sustanon 250 — Phenylpropionate	4.5 days	77% · 60 mg
Sustanon 250 — Isocaproate	8 days	72% · 60 mg
Sustanon 250 — Decanoate	15 days	64% · 100 mg

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How it works

The model behind the curve

First-order elimination

C(t) = Σ dose × active% × e^(−k·Δt), k = ln2 / half-life

Each dosing interval contributes a decaying amount in the reference model; the curve sums every prior contribution — pharmacokinetic arithmetic from published half-lives, not personal advice. The active fraction (e.g. testosterone enanthate is 72% active hormone by mass).

Sustanon 250 — four esters, four curves

Each 250 mg/mL of Sustanon contains 30 mg propionate (~2 day half-life, fast release), 60 mg phenylpropionate (~4.5 days),60 mg isocaproate (~8 days) and 100 mg decanoate(~15 days, slow release). The plotter draws each ester separately plus the combined total — the same decomposition used in published multi-ester pharmacokinetic analysis.

Steady state

≈ 5 × half-life

After roughly four to five half-lives, input equals elimination and peaks become predictable. The plotter reports the steady-state peak, trough and swing from the final four weeks of the run.

This is a simplified single-compartment model with population-average half-life estimates (Behre & Nieschlag 1998, and PubChem molecular-weight data). Individual variation is significant. For laboratory research context only — not medical advice.

FAQ

Frequently asked questions

CAS 13103-34-9

10mL vial · In stock

For laboratory research use only