Does splitting testosterone cypionate into more frequent doses keep levels steadier?

In the model, it narrows the swing but not the average. With the same total per week, the peak-to-trough ratio at steady state is about 1.33:1 twice weekly, about 1.79:1 weekly, about 3.23:1 every 2 weeks. Which schedule to use is a decision for you and your prescriber.

Is this chart my actual testosterone cypionate level?

No. It is a modeled estimate from a published half-life, using the same one-compartment model as the Dose Track app. Real levels vary with body weight, injection site, kidney and liver function and other factors, and only a lab test measures them. It is not medical advice.

Testosterone Cypionate Half-Life: Peak and Steady State

Q: How long does testosterone cypionate take to reach steady state?

About 40 days (~5.7 weeks) of regular dosing at the same amount and interval, which is 5 half-lives. With a half-life of about 8 days, levels reach about 50% of steady state after 8 days and about 90% after 27 days (~3.8 weeks). Changing the dose or interval starts a new climb toward a new steady state.

Q: How long does testosterone cypionate stay in your system after the last dose?

Roughly 5 half-lives, about 40 days (~5.7 weeks), until about 97% has cleared in the model. Half is gone about 8 days after levels start falling. Real clearance varies from person to person, and a drug can still have effects after levels are low.

Short answer: Testosterone cypionate has a half-life of about 8 days (Depo-Testosterone (testosterone cypionate) label) and reaches steady state after about 40 days (~5.7 weeks) of regular dosing. We could not confirm a published time to peak for testosterone cypionate, so we do not state one. With the same total per week, Dose Track's model gives a peak-to-trough swing of about 1.33:1 twice weekly, about 1.79:1 weekly and about 3.23:1 every 2 weeks.

Weekly vs twice weekly: how do testosterone cypionate levels compare?

The Depo-Testosterone label gives 50 to 400 mg every 2 to 4 weeks for testosterone replacement. The chart keeps the same 100 mg per week in every line (200 mg every 2 weeks, 100 mg weekly, 50 mg twice weekly) to compare spacing only. It is a comparison, not a recommendation. Source: Depo-Testosterone (testosterone cypionate) label. Bioavailability 100% as in the app. Dashed line: 5 half-lives. Change the amount or schedule in the calculator.

When does testosterone cypionate peak after a dose?

We could not confirm a published time to peak for testosterone cypionate, so we do not state one. The chart follows the app: for an oil injection into muscle it counts what is still in the injection depot plus what is in blood, so the modeled total is highest right after each shot and then falls as the depot releases and the body clears it. The curve still needs a rise time, so it uses the app's modeling estimate; treat the shape of the first day or two as approximate.

How long does testosterone cypionate take to reach steady state?

With regular dosing at a fixed amount and interval, levels climb toward steady state by the same fraction every half-life, whatever the dose. At a half-life of about 8 days:

Time from the first dose to each share of steady state, testosterone cypionate (half-life 8 days).
Share of steady state	Half-lives	Time
50%	1	8 days
75%	2	16 days
90%	3.3	27 days (~3.8 weeks)
97% (Dose Track's steady-state rule)	5	40 days (~5.7 weeks)

How much do testosterone cypionate levels swing between doses?

The longer the gap between doses compared with the half-life, the bigger the swing from peak to trough and the less the levels build up. These ratios do not depend on the amount.

Steady-state peak:trough and build-up by dosing interval, testosterone cypionate, in Dose Track's model.
Interval	Peak : trough	Build-up vs one dose
Daily	1.09 : 1	12.05×
Every other day	1.18 : 1	6.29×
Twice weekly	1.33 : 1	3.82×
Weekly	1.79 : 1	2.2×
Every 2 weeks	3.23 : 1	1.42×

Build-up is the accumulation ratio 1 / (1 − e^−k·τ), with k = ln 2 / half-life and τ the interval.

How long does testosterone cypionate stay in your system?

After the last dose, about half is gone every 8 days. After 5 half-lives, about 40 days (~5.7 weeks), roughly 97% has cleared in the model.

Where do these numbers come from?

The FDA Depo-Testosterone label says the half-life of testosterone cypionate injected into muscle is about eight days. The label gives no time to peak, so we leave it out.

Depo-Testosterone (testosterone cypionate) prescribing information. DailyMed.

The curve uses the half-life, time to peak, route and bioavailability built into the Dose Track app for testosterone cypionate, and the same one-compartment model with first-order absorption. These are modeled estimates from published half-lives, drawn with the same one-compartment model as the Dose Track app. Real levels vary from person to person, and only a lab test measures them. This is not medical advice and not a dosing recommendation; dosing decisions belong with you and your prescriber.

Vial sizes and syringe math are in the Testosterone Cypionate guide.

When does testosterone cypionate peak and reach steady state?