PEDEvidence@pedevidence

Nandrolone (Deca / NPP)

FROM THE REEL TO THE RESEARCH

The quick answer, with the evidence attached.

NPP and Deca deliver the same parent androgen, nandrolone. The major demonstrated difference is the time course of delivery, not a different muscle receptor or a proven difference in the quality of new muscle. Human pharmacokinetic research supports different exposure profiles, but it does not establish which ester produces more hypertrophy when the relevant exposure is comparable.

From NPP vs Deca · Editorial update 2026-10-16

Explore the mechanism ↗See measured outcomes ↗Inspect the sources ↗
Related comparisons (3)
Mechanisms explain possibilities. Outcomes, populations and study limitations determine what the evidence supports.

What it is & what research shows

Study example available

Nandrolone decanoate is a long-ester anabolic steroid supplied as an intramuscular oil injection. It is a synthetic derivative of testosterone. The cited human label indicates nandrolone decanoate for management of anemia associated with renal insufficiency, where it has been shown to increase hemoglobin and red-cell mass. [1.1]

One selected study: An open-label randomized study compared nandrolone alone with nandrolone plus supervised resistance training for 12 weeks. Thirty men with HIV and reduced immune-cell counts participated. There was no placebo group. A usable numeric dose was not reported in the abstract reviewed for this summary. Lean mass increased 3.9 kg with nandrolone alone and 5.2 kg with added training. Strength gains were greater with training. Body-cell mass and measured thigh-muscle areas increased in both groups without significant between-group differences for those measures. The study was explicitly open-label and lacked a placebo comparison, limiting attribution of within-group changes to nandrolone. The abstract does not report adverse-event results; these findings do not establish safety. [2.1]

Studied methods, not dosing advice. Selected evidence, not a complete literature review or formal quality appraisal. Read the study summary
Sources & reading scope

By PED Evidence · Content reviewed

Source scope is listed with each reference. Prepared by PED Evidence with AI assistance. Independent clinician review has not been completed. Review standards

Evidence summarized on PED Evidence

11 completed summaries

10 human-study reports

7 randomized-trial candidates

1 safety-topic reports

These counts describe completed summaries on this site, not the size of the full literature. Publications can share participants; design labels are discovery metadata, not appraisals.

Filter, save and compare Nandrolone studies →
More about Nandrolone: identity, safety & reference details
Small moleculeAnabolic steroids
Primary research area
Androgenic steroids · clinical & muscle research
Regulatory status
Prescription medicine, jurisdiction-dependent
Evidence level
Human, indication-specific
Primary mechanism
Androgen-receptor agonist with distinct 5α-reduced metabolites
Reference profile available · Coverage varies by section

Also known as Nandrolone decanoate · Nandrolone phenylpropionate · Nandrolone undecanoate · Nandrolone cypionate · Deca-Durabolin · NPP

Start with the research

An outcome-specific synthesis has not been prepared for this compound. This is a coverage gap, not evidence that it has no effect.

Open studies and trial records
Uses & research

The cited human label indicates nandrolone decanoate for management of anemia associated with renal insufficiency, where it has been shown to increase hemoglobin and red-cell mass. [1]

Known half-life

No source-verified value in this profile yet. A treatment schedule or duration of an effect is not a drug half-life.

Half-life describes how quickly the measured drug concentration falls by half. It does not set a dosing interval.
Evidence & important limits

A verified human half-life for the specific preparation is not stated in the source used for this profile. The label says the drug has not been shown safe and effective for athletic enhancement and describes lipid, liver, reproductive and cardiovascular warnings. [1]

Safety & evidence boundaries

Source-specific information, not a personal safety clearance or monitoring plan.

A verified human half-life for the specific preparation is not stated in the source used for this profile. The label says the drug has not been shown safe and effective for athletic enhancement and describes lipid, liver, reproductive and cardiovascular warnings.

DailyMed nandrolone decanoate label
Explore safety questions by system

These are literature filters, not claims that this compound causes each effect. A keyword match is not a confirmed adverse reaction.

Heart, blood pressure & lipidsLiver injuryKidney functionGlucose effectsReproductive & endocrine effectsMood & sleepAdverse effects & interactions

Interactions, rare harms, long-term effects and reversibility require separate evidence. Do not infer they are absent when the sources here do not address them.

Identity, names & formulations

Canonical compound: Nandrolone · nandrolone

Searchable names: Nandrolone decanoate, Nandrolone phenylpropionate, Nandrolone undecanoate, Nandrolone cypionate, Deca-Durabolin, NPP

Names share a parent research page. Different esters, salts, routes and brands are not assumed to have the same half-life, indication or exposure.

Research subject only. Excluded from evidence-leader and supportive-compound recommendations.

Combination evidence stays attached to the studied combination. It is not automatically assigned to each ingredient.

Understand the evidence types

Read the model and design first, then the population, outcome and limitations. These categories describe evidence, not a best-compound ranking.

Randomized human trials
Compare assigned interventions. Randomization does not by itself establish low bias or relevance to every population.
Controlled human studies
Use a comparison group; allocation and confounding still matter.
Prospective human research
Follows participants forward. It may be observational or interventional, so this is not a separate quality grade.
Observational human research
Describes associations. Confounding can explain differences.
Case reports and series
Useful for unusual events and safety signals, not reliable rates or effect sizes.
Animal research
Can test biology and function in a living model. Human exposure, benefit and safety remain separate questions.
Cell and tissue research
Tests responses in a preparation, including human-derived cells. It is not a human participant trial.
Mechanistic and computational evidence
Helps explain or predict a pathway; predictions need experimental and clinical testing.
Anecdotal reports
Self-reported experiences can generate questions. Product identity, selection bias and other interventions may be uncontrolled.

Systematic reviews synthesize studies and depend on their quality. Preprint status and abstract versus full-paper reading are separate labels. Citation popularity measures attention, not reliability. A study summary is not a formal quality appraisal.

Related compounds

Sources for this profile

  1. 1. DailyMed nandrolone decanoate label Human drug label · indication and safety warnings

Reference facts checked 2026-09-16. Source scope is listed above; this is not a formal quality appraisal. See each label for full prescribing information.

Browse all studies

Study model describes the source. Confidence depends on methods, replication, population and outcome.

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Nandrolone study summaries

Human-first reading order. Intervention candidates are distinguished from background mentions in the library.