hormoneInjectableControlledSchedule III (US)Not FDA-approvedPrescription only (US)Nandrolone esters are anabolic androgenic steroids classified as Schedule III controlled substances under US federal lawAll cited evidence for nandrolone phenylpropionate specifically is from animal studies; no human clinical trials of this ester are cited here
Nandrolone PhenylpropionateBenefits, Dosage & Interactions
Also known as: NPP, Durabolin
Nandrolone Phenylpropionate (NPP) is an anabolic androgenic steroid (AAS) that is a synthetic derivative of testosterone. It is a shorter-acting ester variant of nandrolone, distinguishing it from nandrolone decanoate (Deca-Durabolin) which has a much longer half-life. Research on Nandrolone Phenylpropionate focuses on muscle and strength and bone and joint health.
How much Nandrolone Phenylpropionate do people take?
Rat studies used injected doses on the order of a few milligrams per kilogram body weight; no human dosing data are available in the cited literature. Route reported: Intramuscular or subcutaneous injection in the cited animal studies. Frequency reported: Repeated injections over days to weeks in the cited rat protocols. These are amounts documented in the cited studies and labels for Nandrolone Phenylpropionate — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Preclinical — Animal and in-vitro studies only, no published human RCTs.
Evidence strengthPreclinical · 1/4
PreclinicalStrong human evidence
Animal and in-vitro studies only, no published human RCTs.
Plasma half-life
~1 days
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
Reported for Nandrolone Phenylpropionate in the cited sources. Published ranges are not dosing advice.
Mixing Nandrolone Phenylpropionate: bacteriostatic water and syringe units
The vial arrives as dry powder. How much water you add sets the strength, and the strength sets the mark you draw to on the syringe. The table assumes a 5 mg vial and a 250 mcg example draw on a U-100 insulin syringe, where 100 units is one millilitre. If your vial is a different size, scale it — the arithmetic is the same.
| Bacteriostatic water added | Resulting strength | 250 mcg draws to |
|---|---|---|
| 1 mL | 5 mg/mL | 5 units |
| 2 mL | 2.5 mg/mL | 10 units |
| 3 mL | 1.67 mg/mL | 15 units |
Units, not millilitres. Insulin syringes are marked in units, and mixing up mcg and mg on a peptide label is the single most common error people report. Check the label twice. Run your own vial through the calculator.
Storage and stability
- Before mixing
- Sealed and still as a dry powder, Nandrolone Phenylpropionate vials are normally kept in the fridge at 2–8 °C, out of light. Short spells at room temperature during shipping are the norm for lyophilized peptides and are not, on their own, a sign the vial is spoiled.
- After mixing
- Once bacteriostatic water goes in, the vial belongs in the fridge and is generally treated as good for about 28 days — that is how long the benzyl alcohol in bacteriostatic water is relied on to hold back bacterial growth. Plain sterile water has no preservative, so a vial mixed with it is a single-session vial. Never freeze a reconstituted vial.
- When to throw it out
- A properly mixed vial is clear. Cloudiness, floating strands, a color change or powder that will not go into solution after gentle swirling all mean the vial should be discarded rather than used. Shaking a peptide vial hard is the usual cause — swirl it, or run the water down the inside wall of the vial instead of onto the powder.
Handling and shelf-life figures describe general practice for lyophilized peptides. They are not a dose and not medical advice — your prescriber or the product label sets the amount.
References & evidence
Documents the Nandrolone Phenylpropionate entry is written from. Each number matches an inline marker above.
- [1]Anti-inflammatory activity of nandrolone phenylpropionateIndian Journal of Experimental Biology · 1983 · Peer-reviewed · PMID 6674140
- [2]Effect of nandrolone phenylpropionate on protein metabolism in ratsHormone and Metabolic Research · 1985 · Peer-reviewed · PMID 4054833
- [3]Effects of the anabolic steroid nandrolone phenylpropionate on craniofacial growth in ratsJournal of Morphology · 1994 · Peer-reviewed · PMID 8021946
References & Evidence
Sources on this page that document Nandrolone Phenylpropionate dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Nandrolone Phenylpropionate studied for?
What is Nandrolone Phenylpropionate?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Nandrolone Phenylpropionate (NPP) is an anabolic androgenic steroid (AAS) that is a synthetic derivative of testosterone. It is a shorter-acting ester variant of nandrolone, distinguishing it from nandrolone decanoate (Deca-Durabolin) which has a much longer half-life. Originally developed for medical applications, like other anabolic steroids, NPP has also been used non-medically, particularly in athletic and bodybuilding communities, for its anabolic effects. It is a controlled substance in many regions due to its potential for misuse and adverse effects. As a prescription medication, its use is directed by a licensed clinician for specific medical conditions.
What does the research say about Nandrolone Phenylpropionate?
Tap a section to expand.
Nandrolone phenylpropionate exerts its effects primarily by binding to androgen receptors in various tissues, including skeletal muscle, bone, and adipose tissue. Activation of these receptors leads to increased protein synthesis and nitrogen retention, which are key processes for muscle growth and repair. Unlike testosterone, nandrolone is metabolized to dihydronandrolone (DHN) by the 5-alpha reductase enzyme, rather than dihydrotestosterone (DHT). DHN is a weaker androgen than DHT, which contributes to nandrolone's relatively lower androgenic side effects compared to some other anabolic steroids. However, it still possesses androgenic activity. Additionally, nandrolone can exhibit progestogenic activity due to its structural similarity to progesterone, and it can also aromatize into estrogens, though at a lower rate than testosterone. These hormonal interactions contribute to both its anabolic properties and its potential side effects. (DrugBank, PubChem)
Source for this section: Sources for How does Nandrolone Phenylpropionate work?: Jumps to this entry in the sources and references list at the end of the page.
In a medical context, nandrolone phenylpropionate and other nandrolone esters have been studied and used for their anabolic properties in conditions associated with muscle wasting and bone loss. These potential therapeutic uses include:
* **Treatment of muscle wasting conditions:** Anabolic steroids like nandrolone can help patients regain muscle mass lost due to chronic illnesses, severe trauma, or certain medical treatments. (NIH Clinical Trials)
* **Management of severe anemia:** Some forms of anemia, particularly those related to kidney failure, have been treated with anabolic steroids due to their erythropoietic (red blood cell stimulating) effects. (MedlinePlus)
* **Osteoporosis:** Nandrolone has shown promise in some studies for increasing bone mineral density, particularly in postmenopausal women, though its use is often limited by potential side effects. (Cochrane Review)
It is important to note that the use of nandrolone for these conditions is under strict medical supervision due to its classification as a controlled substance and its potential for adverse effects. Non-medical use is associated with significant health risks and is illegal in many jurisdictions.
The medical evidence for nandrolone phenylpropionate predominantly comes from clinical studies exploring its efficacy in treating various catabolic states and conditions involving muscle wasting or bone density loss. Research has demonstrated its ability to enhance protein synthesis and nitrogen retention, contributing to increased lean body mass and strength in specific patient populations. For instance, studies have investigated its role in managing muscle atrophy in HIV/AIDS patients or those undergoing sarcopenia. (NIH Clinical Trials). Evidence also supports its effects on bone metabolism, showing improvements in bone mineral density markers in some trials, particularly in postmenopausal osteoporosis, though long-term safety data is often a limiting factor. (Cochrane Review). While evidence exists for its physiological effects, robust, large-scale, long-term studies on NPP specifically, compared to nandrolone decanoate, for all postulated benefits in healthy populations are limited and ethically constrained due to its controlled substance status and potential for misuse. The medical community typically reserves its use for specific, physician-diagnosed conditions where the benefits are deemed to outweigh the risks. (DrugBank)
Nandrolone phenylpropionate, like other anabolic androgenic steroids, can cause a range of side effects due to its hormonal activity. These can vary depending on the individual, duration of use, and dose. Potential side effects include:
* **Androgenic effects:** Acne, oily skin, male pattern baldness (in genetically predisposed individuals), and increased body hair growth. In females, virilization (development of male characteristics) can occur, including deepening of the voice, clitoral enlargement, and menstrual irregularities.
* **Estrogenic effects:** Although nandrolone aromatizes to estrogen at a lower rate than testosterone, it can still lead to estrogen-related side effects such as gynecomastia (enlargement of male breast tissue) and water retention, particularly at higher doses. Progestogenic activity can also contribute to some of these effects.
* **Cardiovascular effects:** Adverse changes in lipid profiles (decreased HDL cholesterol, increased LDL cholesterol), increased blood pressure, and an increased risk of cardiovascular disease.
* **Hepatotoxicity:** While less hepatotoxic than oral C17-alpha alkylated steroids, injectable nandrolone can still contribute to liver stress or damage, especially with prolonged use or abuse.
* **Testicular atrophy and suppression of natural testosterone production:** Exogenous anabolic steroid use can suppress the body's natural production of testosterone, leading to testicular atrophy, decreased sperm count, and infertility.
* **Psychological effects:** Mood swings, aggression (often referred to as 'roid rage'), depression, and addiction potential.
* **Injection site reactions:** Pain, swelling, or infection at the injection site.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
The use of nandrolone phenylpropionate carries significant warnings due to its potent hormonal effects and Schedule III controlled substance status in the United States. It should be used only under the strict supervision of a licensed clinician for specific medical conditions. Off-label or non-medical use, particularly for performance enhancement, is associated with substantial health risks and is illegal in many jurisdictions. Individuals with a history of cardiovascular disease, liver dysfunction, kidney disease, or prostate issues should exercise extreme caution or avoid nandrolone altogether. Women should be aware of the high risk of virilizing effects, which can be irreversible. Adolescents should avoid use due to the risk of premature epiphyseal closure, halting linear growth. Long-term use or abuse can lead to irreversible adverse health consequences. Regular monitoring of liver function, lipid profiles, hematocrit, and hormonal levels is crucial during medical treatment with nandrolone. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Nandrolone Phenylpropionate is contraindicated in several conditions. These include known or suspected prostate or breast carcinoma in males due to the potential for exacerbating growth of hormone-sensitive tumors. It is also contraindicated in pregnant or breastfeeding women due to the risk of fetal harm and transfer to breast milk. Individuals with severe liver impairment, significant renal impairment, or uncontrolled hypercalcemia should generally avoid nandrolone use. Patients with a known hypersensitivity to nandrolone or any components of the preparation are also contraindicated. It should be used with extreme caution or avoided in patients with ischemic heart disease or heart failure, as it can worsen fluid retention and cardiovascular risk factors. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Concomitant use of Nandrolone Phenylpropionate with certain medications or substances can lead to adverse interactions or increase the risk of side effects. This includes:
* **Anticoagulants (e.g., Warfarin):** Anabolic steroids can enhance the effects of anticoagulants, increasing the risk of bleeding. Close monitoring of coagulation parameters is essential.
* **Corticosteroids:** Concurrent use can increase the risk of edema (fluid retention), particularly in individuals with pre-existing cardiac or liver disease.
* **Insulin and Oral Hypoglycemic Agents:** Nandrolone can alter glucose metabolism, potentially requiring adjustments in the doses of insulin or antidiabetic medications.
* **Diuretics:** Anabolic steroids can lead to sodium and fluid retention, potentially counteracting the effects of diuretics.
* **Other Hepatotoxic Agents:** Combining with other substances known to be toxic to the liver can increase the risk of liver damage.
* **Alcohol:** Excessive alcohol consumption combined with anabolic steroid use can exacerbate liver strain and increase cardiovascular risks.
* **Other Anabolic Steroids or Performance-Enhancing Drugs:** Stacking multiple anabolic agents or other performance-enhancing drugs significantly increases the risk and severity of adverse effects, often in unpredictable ways. This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Nandrolone Phenylpropionate is administered via intramuscular injection. Due to its relatively short half-life of approximately 100 hours (about 4-5 days), medical dosing typically involves more frequent injections compared to its longer-ester counterpart, nandrolone decanoate. This frequent administration is intended to maintain stable blood levels and achieve desired therapeutic effects. The precise frequency and duration of administration for medical use are determined by a licensed clinician based on the individual's condition, response to treatment, and monitoring of side effects. For controlled substances such as nandrolone phenylpropionate, dose and timing must be set by a licensed clinician.
Source for this section: Sources for When should you take Nandrolone Phenylpropionate?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
Reading about Nandrolone Phenylpropionate is the first step — DoseRoutine helps you act on it. These free tools turn what you just learned into a routine.
What interacts with Nandrolone Phenylpropionate?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any peptide + hormone | Note | Category ruleConfidence: theoretical | Injectable peptides plus hormones can have overlapping or compounding effects that aren't always well characterized.Source pending | Track bloodwork with a provider; don't assume combinations are neutral. |
Frequently asked questions about Nandrolone Phenylpropionate
Nandrolone Phenylpropionate is a hormone. It is also known as NPP and Durabolin. The references summarized come from NIH and PubMed records, FDA labeling where it exists, and Mayo Clinic patient material.
Nandrolone Phenylpropionate is commonly discussed in the context of supporting muscle and bone-joint. Individual response varies, and use should be reviewed with a licensed clinician who can weigh the benefits and risks for your situation.
For Nandrolone Phenylpropionate, it is typically administered by injection, it is typically taken null, and its approximate half-life is 24 hours, which influences dosing frequency. Always follow the specific dose your clinician or the product label prescribes.
Nandrolone Phenylpropionate carries potential side effects and drug interactions, documented in NIH, Mayo Clinic, and FDA label sources. Nandrolone Phenylpropionate is classified as a controlled substance in some jurisdictions, so legal status and prescribing rules apply. Stop use and contact a clinician if you experience unexpected symptoms.
As a hormone, Nandrolone Phenylpropionate can overlap with other supplements, prescription medicines, hormones and peptides. With a reported plasma half-life near 24 hours, separating doses can change the picture as much as removing one. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Nandrolone Phenylpropionate with no sign-up.
Whether Nandrolone Phenylpropionate fits alongside testosterone replacement therapy depends on the protocol — dose, ester and ancillaries such as HCG or anastrozole — and on current bloodwork. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
"Peptides" is not one category — healing peptides, GLP-1 agonists, growth-hormone secretagogues and melanocortins each behave differently next to Nandrolone Phenylpropionate. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
With a plasma half-life near 24 hours, once-daily dosing is the usual pattern for Nandrolone Phenylpropionate. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
With a plasma half-life near 24 hours, a single missed dose of Nandrolone Phenylpropionate usually has a smaller effect on overall exposure than an irregular pattern of missed doses does. For injectable protocols, shifting the next injection is usually preferred over doubling it. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For an injectable like Nandrolone Phenylpropionate the record needs more than a checkbox: vial concentration, the measured volume, and which site the last injection went into. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
Rat studies used injected doses on the order of a few milligrams per kilogram body weight; no human dosing data are available in the cited literature. Route reported: Intramuscular or subcutaneous injection in the cited animal studies. Frequency reported: Repeated injections over days to weeks in the cited rat protocols. These are amounts documented in the cited studies and labels for Nandrolone Phenylpropionate — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at Nandrolone Phenylpropionate?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Pharmacokinetics and pharmacodynamics of nandrolone esters in oil vehicle: effects of ester, injection site and injection volume(opens PubMed in a new tab)J Pharmacol Exp Ther · 1997 · PMID 9103484 · https://pubmed.ncbi.nlm.nih.gov/9103484/
- 2.The effect of nandrolone phenylpropionate (Durabolin) on the bone-marrow suppression caused by cyclophosphamide(opens PubMed in a new tab)Br J Surg · 1971 · PMID 4929363 · https://pubmed.ncbi.nlm.nih.gov/4929363/
- 3.Effect of nandrolone phenylpropionate (NSC-23162e) on the bone marrow suppression caused by cyclophosphamide (NSC-26271): a clinical trial(opens PubMed in a new tab)Cancer Chemother Rep · 1974 · PMID 4615786 · https://pubmed.ncbi.nlm.nih.gov/4615786/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 229455(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/229455
Verify at
Publisher search links for Nandrolone Phenylpropionate. These are places to check the information — they are not citations, so they are not numbered.
- DrugBank(publisher search, opens in a new tab)DrugBank Online · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Nandrolone Phenylpropionate?
Plain-text summary, safe to quote verbatim:
Nandrolone Phenylpropionate (NPP) is an anabolic androgenic steroid (AAS) that is a synthetic derivative of testosterone. It is a shorter-acting ester variant of nandrolone, distinguishing it from nandrolone decanoate (Deca-Durabolin) which has a much longer half-life. Research on Nandrolone Phenylpropionate focuses on muscle and strength and bone and joint health.
Source: DoseRoutine — https://doseroutine.com/library/nandrolone-phenylpropionate
Nandrolone Phenylpropionate cheat sheet
DoseRoutine cheat sheet · Hormone
Nandrolone Phenylpropionate
Nandrolone Phenylpropionate (NPP) is an anabolic androgenic steroid (AAS) that is a synthetic derivative of testosterone. It is a shorter-acting ester variant of nandrolone, distinguishing it from nandrolone decanoate (Deca-Durabolin) which has a much longer half-life.
Evidence
Preclinical
Animal and in-vitro studies only, no published human RCTs.
Studied range
Rat studies used injected doses on the order of a few milligrams per kilogram body weight; no human dosing data are available in the cited literature
Route
Intramuscular or subcutaneous injection in the cited animal studies
Frequency studied
Repeated injections over days to weeks in the cited rat protocols
Half-life
~1 days
Schedule III (US)Not FDA-approvedPrescription only (US)Nandrolone esters are anabolic androgenic steroids classified as Schedule III controlled substances under US federal lawAll cited evidence for nandrolone phenylpropionate specifically is from animal studies; no human clinical trials of this ester are cited hereMuscleBone Joint
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/nandrolone-phenylpropionate
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Nandrolone Phenylpropionate — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/nandrolone-phenylpropionate
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