View Report
January 16, 2024
Measured Result
145.31 mg
96.87% of label claim
Stealth Labs
Stealth Labs
Latest Laboratory Result 145.31 mg January 16, 2024 · 96.87% of label claim View
NPP 150 mg
Product Information Compound Details
Active Substance Nandrolone Phenylpropionate Short-acting nandrolone ester
150 mg/mLStrength 150 mg/mL
Package 10 mL Vial 1,500 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
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U.S. Domestic
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Product Overview
NPP 150 mg by Stealth Labs
NPP 150 mg is an oil-based injectable containing nandrolone phenylpropionate manufactured by Stealth Labs and dosed at 150 mg/mL in a 10 mL vial.
Nandrolone Phenylpropionate Injectable
NPP 150 mg is a short-acting anabolic-androgenic steroid containing nandrolone phenylpropionate, a nandrolone ester with a faster release profile than nandrolone decanoate. Its shorter duration of action allows for more flexible cycle management and faster clearance compared to longer-acting nandrolone preparations.
Nandrolone phenylpropionate has been used in clinical settings as an adjunct to specific therapies and dietary measures in pathologic conditions characterized by a negative nitrogen balance, and for the palliative treatment of selected cases of disseminated mammary carcinoma in women. In non-medical bodybuilding settings, it is commonly referenced for its anabolic effects and joint comfort properties, though such use falls outside approved medical indications.
Nandrolone has a nitrogen-saving action and promotes protein synthesis, with an enhanced anabolic and reduced androgenic activity compared to testosterone. The phenylpropionate ester gives the preparation a duration of action of about one week after injection, providing a middle ground between the very short-acting nandrolone base and the long-acting decanoate ester.
Key Benefits of NPP 150 mg
- Short-acting phenylpropionate ester for faster clearance than decanoate
- Enhanced anabolic and reduced androgenic activity compared to testosterone
- 150 mg/mL concentration in a 10 mL vial
- Commonly referenced for joint comfort and lean mass gains in non-medical contexts
- Manufactured by Stealth Labs with published laboratory verification
Formulation
Oil-Based Injectable
NPP 150 mg is presented as an oil-based injectable formulation. The specific carrier oil is not identified in the available product information.
Product Profile
Nandrolone Phenylpropionate Profile
Nandrolone phenylpropionate is a short-acting nandrolone ester designed for faster release and clearance than nandrolone decanoate, with a pharmacokinetic profile that supports more frequent but lower-volume injections.
Short-Acting Nandrolone Ester
The phenylpropionate ester provides a shorter half-life of approximately 4.5 days, compared to the decanoate ester which is significantly longer. This shorter duration allows for faster clearance from the body and more rapid adjustment of blood levels if side effects occur.
Pharmacokinetic research demonstrates that plasma nandrolone concentrations peak higher and earlier with the phenylpropionate ester compared to the decanoate ester. The study also found that injection site and volume influence pharmacokinetics, with smaller injection volumes producing higher bioavailability.
Nandrolone is structurally related to testosterone but has an enhanced anabolic and reduced androgenic activity profile. It lacks the C17alpha-alkyl group associated with liver dysfunction and cholestasis, making it less hepatotoxic than oral C17-alpha-alkylated steroids.
Release Profile
Rapid Release, Moderate Duration
Nandrolone phenylpropionate has a half-life of approximately 4.5 days, allowing for administration every 2–3 days. This is significantly faster than nandrolone decanoate, which requires less frequent administration. The shorter ester provides more control over blood levels but necessitates more frequent injections.
NPP 150 mg vs Other Stealth Labs Preparations
Stealth Labs offers several nandrolone and anabolic preparations commonly referenced in bodybuilding contexts. Deca 300 contains nandrolone decanoate, the longer-acting nandrolone ester, while Testosterone Propionate provides a short-acting testosterone option for stacking.
The primary distinction between NPP 150 mg and Deca 300 is the ester and resulting release profile. NPP offers faster onset and clearance, making it easier to manage if side effects occur. Deca provides more stable blood levels with less frequent injections. Both contain the same active hormone, nandrolone, but differ in their pharmacokinetic characteristics.
Laboratory Testing
NPP 150 mg Lab Reports
Published laboratory reports for NPP 150 mg are shown below with the test date, measured concentration and percentage of the product's 150 mg/mL label claim.
View Report
Laboratory results apply to the specific tested sample represented in each published report and should not be interpreted as a measurement of every vial or production batch.
Dosage & Usage
NPP 150 mg Dosage & Usage
The information below is provided for educational reference only. Nandrolone phenylpropionate is a Schedule III controlled substance in the U.S.. Medical use requires appropriate diagnosis, clinical supervision and ongoing monitoring. Non-medical use falls outside approved indications.
Typical Dosage Ranges
In clinical settings, nandrolone phenylpropionate has been referenced at 25–50 mg per week for pathologic conditions characterized by negative nitrogen balance. In non-medical bodybuilding settings, NPP 150 mg is commonly referenced in the range of 300–400 mg per week for beginners, with more experienced users referencing 400–600 mg per week. Some references cite ranges up to 800 mg per week, though higher doses increase side effect risk.
| Use Case | Common Reference Range | Injection Frequency |
|---|---|---|
| Clinical (negative nitrogen balance) | 25–50 mg / week | Once weekly |
| Beginner (non-medical) | 300–400 mg / week | Every 2–3 days |
| Intermediate to advanced (non-medical) | 400–600 mg / week | Every other day or 3x weekly |
Stacking & Cycle Considerations
In non-medical bodybuilding contexts, nandrolone phenylpropionate is commonly stacked with testosterone to help maintain normal physiological function. A common approach referenced in bodybuilding discussions is a testosterone-to-NPP ratio of approximately 2:1, such as 600 mg testosterone and 300 mg NPP per week. Stealth Labs offers Testosterone Propionate or Testosterone Enanthate as base compounds.
Because of the shorter phenylpropionate ester, NPP cycles are typically referenced as lasting 6–8 weeks in non-medical contexts. The faster clearance allows for quicker recovery compared to longer-acting nandrolone preparations. Cycle structure should account for the suppression of natural testosterone production.
Managing Side Effects
Nandrolone is associated with progestogenic activity, which can contribute to side effects distinct from those of testosterone. Nandrolone lacks the C17alpha-alkyl group and is less hepatotoxic than oral C17-alpha-alkylated steroids. However, it can still cause androgenic effects such as acne and hair loss in predisposed individuals.
High dosages, prolonged treatment, and too frequent administration may cause fluid retention, inhibition of spermatogenesis, and virilization in women. Aromatase inhibitors such as Arimidex may be referenced for managing estrogen-related effects, though nandrolone's progestogenic activity requires separate consideration. Blood pressure and lipid values should be monitored during use.
Post-Cycle Therapy (PCT)
After completing a cycle with NPP 150 mg, post-cycle therapy is commonly recommended in non-medical contexts to help restore endogenous testosterone production. Because of the short phenylpropionate ester, PCT should begin approximately 3–5 days after the last injection, allowing for faster clearance than nandrolone decanoate.
Agents such as Clomid or Tamoxifen are commonly referenced for this purpose. PCT protocols vary based on cycle length, compounds used and individual factors. Bloodwork and, where possible, medical guidance can help inform recovery strategy.
Important
Individual Response Varies
Dosing strategies, support compounds and recovery protocols should be adjusted based on experience level and bloodwork where possible. The information above is for educational reference and does not constitute medical advice.
Safety & Information
Nandrolone Phenylpropionate Safety Information
Nandrolone phenylpropionate is a Schedule III controlled substance in the U.S.. It can affect hematologic, hepatic, cardiovascular, and endocrine function. Medical use requires appropriate diagnosis, clinical supervision and ongoing monitoring.
Important Safety Information
Nandrolone phenylpropionate is indicated as an adjunct to specific therapies and dietary measures in pathologic conditions characterized by a negative nitrogen balance, and for the palliative treatment of selected cases of disseminated mammary carcinoma in women. It is contraindicated in pregnancy and in known or suspected carcinoma of the prostate or breast in the male.
The FDA proposed withdrawal of approval for nandrolone phenpropionate in 1983 for indications lacking substantial evidence of effectiveness. Current prescribing information indicates that androgenic effects are relatively uncommon at recommended dosages, but the risk increases with high dosages and prolonged treatment.
Important
Non-Medical Use
Higher-than-physiologic exposure to anabolic steroids can carry additional health risks. Product concentration and laboratory verification do not establish that non-medical use is safe or appropriate for an individual. Nandrolone phenylpropionate is a controlled substance and obtaining it without a prescription is illegal.
Potential Adverse Effects
High dosages, prolonged treatment and/or too frequent administration may cause virilization in women, appearing as hoarseness, acne, hirsutism, and increased libido; in prepubertal boys as increased frequency of erections and phallic enlargement; and in girls as increase of pubic hair and clitoral hypertrophy. Hoarseness may be the first symptom of vocal change which may end in long-lasting, sometimes irreversible deepening of the voice.
Other potential adverse effects include amenorrhea, inhibition of spermatogenesis, premature epiphyseal closure, and fluid retention. Anabolic steroids may occasionally induce fluid retention, particularly in patients with latent or overt cardiac failure, renal dysfunction, hypertension, or migraine.
Nandrolone lacks the C17alpha-alkyl group associated with liver dysfunction and cholestasis. However, liver dysfunction has been reported in association with anabolic steroid use, and monitoring is prudent.
Conditions Requiring Medical Evaluation
Nandrolone phenylpropionate should be used with caution in patients with latent or overt cardiac failure, renal dysfunction, hypertension, or migraine, since anabolic steroids may occasionally induce fluid retention. Caution is also recommended in patients with incomplete statural growth, since anabolic steroids in high dosages may accelerate epiphyseal closure.
Skeletal metastases of breast carcinoma and liver dysfunction require monitoring. Hypercalcemia may develop both spontaneously and as a result of anabolic steroid therapy, and should be treated appropriately. Existing cardiovascular disease, abnormal blood counts, and other medical conditions should be discussed with a qualified healthcare professional.
Monitoring During Use
If signs of virilization develop, discontinuation of treatment should be considered, preferably in consultation with the patient. Monitoring of cardiac, renal, and hepatic function is recommended in patients with relevant conditions. Periodic assessment of blood pressure, lipid profile, and hematocrit may be prudent.
Laboratory testing of the product itself is separate from clinical monitoring of the person using the product. Product testing does not assess individual health status or suitability for use.
Product Care
Storage & Handling
Store below 30°C, away from light and moisture. Keep the vial securely stored and protected from conditions that could compromise the product. Inspect the vial and solution before use and do not use a product that appears damaged, contaminated or otherwise abnormal.
Keep all medications and injectable products out of the reach of children.
Further Safety Information
Shipping & Authenticity
Shipping & Product Authenticity
NPP 150 mg is supplied through the official Stealth Labs distribution chain and shipped in original manufacturer packaging with discreet, privacy-focused handling.
USA Domestic
3–5 business days
International
10–15 business days
Order Processing
24–48 business hours
Tracking
Provided after dispatch
Direct Supply
Discreet Delivery & Original Packaging
The outer shipping package remains discreet, with privacy-focused handling and no unnecessary external product details. Products are supplied through the official Stealth Labs distribution chain.
What to Expect
- Orders are processed after payment confirmation
- USA Domestic shipping is typically faster when local stock is selected
- International orders include tracking, though update frequency may vary by destination
- Multiple warehouses may result in separate shipments when applicable
Authenticity Verification
To verify your NPP 150 mg product, use the security code on the vial label and cross-check it on the Stealth Labs official site. Official Stealth Labs presentation, batch-linked lab proof, and original packaging help reinforce product legitimacy and buyer confidence.
For complete delivery details, tracking policy, and reshipment terms, please see our Shipping Info page.
Storage
NPP 150 mg Storage
Proper storage conditions help preserve formulation stability and overall product integrity throughout shelf life.
Recommended Conditions
Store below 30°C, away from light and moisture. Keep the vial in its original packaging until use. Do not freeze. Before administration, inspect the solution and avoid use if it appears cloudy, discolored, contains particulate matter, or if the vial or seal is compromised.
Keep out of reach of children. Follow proper handling and sterile injection practices when administering the product.
Quick Reference
Do & Don't
- Do store below 30°C
- Do keep in original packaging
- Do inspect before each use
- Don't freeze the vial
- Don't expose to direct sunlight
- Don't use if solution looks abnormal
Frequently Asked Questions
NPP 150 mg FAQ
Answers to common questions about NPP 150 mg, nandrolone phenylpropionate, release characteristics, product strength and laboratory testing.
What is NPP 150 mg used for?
NPP 150 mg contains nandrolone phenylpropionate, which has been used clinically as an adjunct in pathologic conditions characterized by a negative nitrogen balance and for selected cases of disseminated mammary carcinoma in women. In non-medical bodybuilding settings it is commonly referenced for lean mass gains and joint comfort, though such use falls outside approved medical indications.
How often should NPP 150 mg be injected?
Because of its short-acting phenylpropionate ester with a half-life of approximately 4.5 days, NPP 150 mg is typically referenced as being administered every 2–3 days. This is more frequent than nandrolone decanoate, which has a longer half-life and requires less frequent injections.
Does NPP 150 mg require PCT?
In non-medical bodybuilding contexts, post-cycle therapy is commonly recommended after an NPP cycle to help restore endogenous testosterone production. Because of the short phenylpropionate ester, PCT should begin approximately 3–5 days after the last injection, allowing for faster clearance than with nandrolone decanoate. Agents such as Clomid or Tamoxifen are commonly referenced for this purpose.
What does nandrolone phenylpropionate do?
Nandrolone phenylpropionate is an injectable anabolic preparation. The pharmacologically active substance is nandrolone, which has a nitrogen-saving action and promotes protein synthesis. Compared to testosterone, it has enhanced anabolic and reduced androgenic activity.
How long does nandrolone phenylpropionate take to work?
Pharmacokinetic research shows that plasma nandrolone concentrations peak higher and earlier with the phenylpropionate ester compared to the decanoate ester. The duration of action is approximately one week after injection. The time required to notice effects depends on the individual, the specific outcome being evaluated, and other factors.
Is nandrolone phenylpropionate the best nandrolone ester?
There is no single nandrolone ester that is universally best. Nandrolone phenylpropionate offers faster onset and clearance than nandrolone decanoate, making it easier to manage if side effects occur. The appropriate choice depends on the circumstances and individual factors, and non-medical use falls outside approved indications.
What is the difference between NPP 150 mg and Deca 300?
Deca 300 contains nandrolone decanoate, the longer-acting nandrolone ester, while NPP 150 mg contains nandrolone phenylpropionate, which is shorter-acting. NPP requires more frequent injections but allows for faster clearance. Both contain the same active hormone, nandrolone.
What is the difference between NPP 150 mg and Testosterone Propionate?
Nandrolone phenylpropionate and testosterone propionate are different active substances with distinct pharmacological profiles. Nandrolone has enhanced anabolic and reduced androgenic activity compared to testosterone. Testosterone Propionate provides a short-acting testosterone option that is commonly stacked with NPP in non-medical contexts.
Is 150 mg of NPP a lot?
A milligram amount cannot be classified as appropriate or excessive without considering the medical indication, individual response, and other factors. It is also important to distinguish a dose in milligrams from a product's concentration in mg/mL. NPP 150 mg is labeled at 150 mg/mL; that concentration does not by itself specify how much should be administered.
What strength is NPP 150 mg?
NPP 150 mg is labeled at 150 mg of nandrolone phenylpropionate per mL. It is supplied in a 10 mL vial, giving 1,500 mg of total labeled nandrolone phenylpropionate content per vial.
Is NPP 150 mg lab tested?
Yes. A published laboratory report dated January 16, 2024 measured NPP 150 mg at 145.31 mg, equivalent to 96.87% of its 150 mg/mL label claim. The complete report can be viewed in the Lab Reports tab. Laboratory results apply to the tested sample represented by the individual report.
Can NPP 150 mg be stacked with other compounds?
In non-medical bodybuilding contexts, nandrolone phenylpropionate is commonly stacked with testosterone, typically at a testosterone-to-NPP ratio of approximately 2:1. Stealth Labs offers Testosterone Propionate or Testosterone Enanthate as base compounds. Stacking decisions should consider individual experience and health status.
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