How much does nandrolone decanoate build up with weekly dosing?

At steady state on a weekly schedule, the model's level is about 2.2 times what one dose gives, and it swings about 1.77:1 between the peak and the trough before the next dose. Longer gaps between doses mean less build-up and a bigger swing.

Is this chart my actual nandrolone decanoate 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.

Nandrolone Decanoate Half-Life: Peak and Steady State Chart

Q: When does nandrolone decanoate peak after a dose?

Blood levels peak about 2.5 days after an injection into muscle, according to Bagchus WM et al. 2005. Dose Track counts what is still in the oil depot as well as what is in blood, so its modeled total is highest right after each injection; blood levels rise as the depot releases. Individual timing varies with the injection site, the amount and the person.

Q: How long does nandrolone decanoate 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 nandrolone decanoate 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: Nandrolone decanoate has a half-life of about 8 days (Bagchus WM et al. 2005) and reaches steady state after about 40 days (~5.7 weeks) of regular dosing. Levels peak about 2.5 days after an injection into muscle. On a weekly schedule the model builds up to about 2.2× a single dose, with a peak-to-trough swing of about 1.77:1.

What do nandrolone decanoate levels look like with weekly dosing?

The US nandrolone decanoate label gives 100 to 200 mg per week for men with anemia of kidney failure. The chart holds 100 mg weekly. Source: Nandrolone decanoate injection USP (Watson Laboratories) label. Bioavailability 100% as in the app. Dashed line: 5 half-lives. Change the amount or schedule in the calculator.

When does nandrolone decanoate peak after a dose?

Levels peak about 2.5 days after an injection into muscle. 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.

How long does nandrolone decanoate 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, nandrolone decanoate (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 nandrolone decanoate 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, nandrolone decanoate, in Dose Track's model.
Interval	Peak : trough	Build-up vs one dose
Daily	1.08 : 1	12.05×
Every other day	1.17 : 1	6.29×
Twice weekly	1.33 : 1	3.82×
Weekly	1.77 : 1	2.2×
Every 2 weeks	3.18 : 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 nandrolone decanoate 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 US label gives no half-life. In healthy men given a single injection into muscle of 50, 100 or 150 mg (Bagchus 2005), the terminal half-life was 7 to 12 days and blood levels peaked about 30 hours after 50 or 100 mg and 72 hours after 150 mg. Dose Track uses 8 days and 60 hours, inside those ranges. Another study (Minto 1997) found that peak levels depend on injection site and volume, with the highest levels after a 1 mL injection into the buttock.

The curve uses the half-life, time to peak, route and bioavailability built into the Dose Track app for nandrolone decanoate, 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 Nandrolone Decanoate guide.

When does nandrolone decanoate peak and reach steady state?