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Lexicon

Muscle & performance

NPP (Nandrolone Phenylpropionate)

The fast Deca - the same nandrolone molecule with a short ester.

1 min read 2 sources Titration Updated June 2026

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Class: 19-nor anabolic (short phenylpropionate ester)
Use: Intramuscular, every other day
Half-life: about 2-3 days
WADA: banned (anabolic)

Getting started

Typical dosing (research context)

Per-week figures in mg, split every other day (EOD). Short ester - same nandrolone as Deca, just faster.

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What is NPP?

NPP (Nandrolone Phenylpropionate) is the exact same nandrolone molecule as Deca, just with a short phenylpropionate ester. It rises and clears faster than Deca - meaning more frequent injections, but faster control and faster onset.

This information is for research and educational purposes only. No medical advice.

How it works

Identical to Deca: androgen receptor activation, weak aromatization, progesterone activity (prolactin topic). Only the kinetics differ.

NPP vs Deca

NPP: short, every other day, faster onset, fast out - popular for those who want to try nandrolone or control it quickly.
Deca: long, 1-2x per week, more convenient, builds over weeks.

Dosing

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What the research shows

Nandrolone research (Johansen, JAMA 1999) applies to both esters equally - once the ester is cleaved, the same nandrolone acts. AAS pharmacology: Kicman 2008.

Side effects

Prolactin - cabergoline as countermeasure.
Strong HPTA suppression - PCT topic.
Weak aromatization, AI if needed.
Injection site irritation more common due to the short ester.

Storage

Store the oil solution at room temperature, protected from light - no fridge needed. Out of reach of children.

Practice

PCT / after coming off

Anabolic substances suppress the body's own testosterone production in the research context. Anyone who comes off a cycle (rather than running it continuously) typically uses a post-cycle therapy (PCT) to restart the natural axis (HPTA).

The standard scheme in the research/literature context combines a SERM (tamoxifen and/or clomifene, alternatively enclomiphene) over roughly four weeks, optionally preceded by HCG to re-sensitise the testes before the SERM block. An aromatase inhibitor (anastrozole/exemestane) belongs more to on-cycle estrogen control than to the PCT itself.

19-nor note: nandrolone and trenbolone are progestagenic and can raise prolactin. The literature additionally discusses a prolactin-lowering agent (cabergoline) and a somewhat longer wash-out window here.

Tip: order the PCT items together with the cycle so they are already on hand when you come off.

This information serves research and educational purposes only. Not medical advice.

Tamoxifen (Nolvadex) SERM, core of PCT Clomid (Clomifen) SERM, core of PCT Enclomiphene (Androxal) SERM alternative HCG testicular restart before PCT Arimidex (Anastrozole) aromatase inhibitor, on-cycle Aromasin (Exemestane) aromatase inhibitor, on-cycle Cabergoline prolactin control for 19-nor

Evidence

Sources

1 Anabolic effects of nandrolone decanoate in dialysis patients - randomized trial. Johansen et al., JAMA, 1999
2 Pharmacology of anabolic steroids - comprehensive review. Kicman, Br J Pharmacol, 2008

Keep reading

More in the lexicon

Deca (Nandrolone Decanoate) The classic bulk staple - slow, mild building with a joint reputation. Read NandroMix 300 Nandrolone in two esters (NPP fast + decanoate long) in one oil, the classic 19-nor mass builder. Read Modafinil (Provigil, Modalert) The eugeroic - wakefulness across 12-15 hours, without the amphetamine character of a classic stimulant. Read

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NPP (Nandrolone Phenylpropionate) in the catalog

Sizes, prices and availability for research use. Straight from the lexicon to the product page.

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