Anabolic steroidAndrogenInjectable19-nortestosteroneNandrolone ester

Nandrolone Cypionate

Also known as Nandrolone Cypionate · Deca Cyp

Written by enwyReviewed 15 Jul 20261 sources0 comments

A moderately long-acting nandrolone ester using the cypionate (cyclopentylpropionate) chain, giving release kinetics similar to nandrolone decanoate. Effects match nandrolone (deca); it is less commonly manufactured than decanoate or phenylpropionate, so ester-specific human data are thin.

01 Overview

Nandrolone cypionate pairs 19-nortestosterone with cyclopentylpropionic acid, the same ester used on testosterone cypionate. Its release profile sits close to nandrolone decanoate, requiring injection roughly weekly. It is an uncommon commercial product; most nandrolone use is decanoate (deca) or phenylpropionate (NPP), so this ester is comparatively niche.

The active hormone after hydrolysis is nandrolone, giving the classic deca profile: strong anabolism, low androgenicity, progestogenic activity and marked suppression. As dedicated human studies on the cypionate ester are lacking, ester-specific claims are graded observational, while the well-studied parent hormone supports clinical grading for core effects.

02 Mechanism

Esterases hydrolyse the cypionate ester to release nandrolone, which binds the androgen receptor with a high anabolic-to-androgenic ratio and exhibits progestogenic activity. It is 5-alpha reduced to the weaker DHN.

03 Dosing

Tier	Dose	Route	Notes
Common (nandrolone-equivalent)	200–400 mg/wk	IM	Similar to deca; typically once or twice weekly.

Ester comparison

Ester	Half-life	Injection freq.	Testosterone by mass

04 Effects

Effect	Magnitude	Evidence
Increased lean massNandrolone's high anabolic activity drives quality lean mass.	steady gains	Clinical
Increased red blood cellsNandrolone stimulates erythropoiesis; used clinically for anaemia.		Clinical
Joint comfortFrequently reported; mechanism uncertain.		Anecdotal

05 Side effects

Effect	Severity	Frequency	Evidence
HPTA suppressionStrong suppression of testosterone and spermatogenesis.	Severe	Universal	Clinical
Sexual dysfunction (deca dick)Low libido/ED tied to progestogenic activity.	Moderate	Common	Observational
Elevated prolactinProgestogenic activity can raise prolactin.	Moderate	Less common	Observational

06 Legal status

United States

Schedule III controlled substance

as of Jan 2026

United Kingdom

Class C controlled drug

as of Jan 2026

07 References

Nandrolone: clinical pharmacology and anabolic profileSports Medicine / endocrinology literature

08 Discussion0 comments

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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.