NPP (Nandrolone Phenylpropionate)
19-nortestosterone 17β-phenylpropionate. Anabolic Androgenic Steroid (AAS), 19-nor steroid.
This page describes what NPP (Nandrolone Phenylpropionate) is and its known risks. It is not medical advice and not a guide to using it. Many of these substances are prescription-only or illegal to use without a prescription. Speak to a doctor.
- Class
- Anabolic Androgenic Steroid (AAS)
- Legal status
- Schedule 4 (South Africa) / Schedule III (USA)
- Half-life
- 3-4 days
- Liver strain
- Low
- Kidney strain
- Moderate
- Converts to estrogen
- Low (progestin activity)
- Suppresses natural hormones
- Yes
Medical uses
- Anemia
- Osteoporosis
- Muscle wasting
What it does in the body
Anabolic
- Muscle mass gain
- Increased strength
- Enhanced collagen synthesis
- Joint pain relief
- Faster onset than Deca
Androgenic
- Lower androgenic activity
- Moderate libido effects
Forms, half-life and detection
| Form | Half-life | Reported detection window |
|---|---|---|
| Injectable (Intramuscular) | 3-4 days | 12-18 months |
Side effects and health risks
Estrogenic
- Gynecomastia (progestin activity)
- Water retention
- Increased blood pressure
Androgenic
- Acne
- Hair loss (less than testosterone)
Heart and blood vessels
- LDL increase
- HDL decrease
- Increased blood pressure
Hormones and fertility
- Severe testosterone suppression
- Prolactin increase
- Testicular atrophy
Mood and mind
- Erectile dysfunction
- Low libido
- Depression
Blood tests worth monitoring
From its known properties, these are the markers doctors commonly check. Getting blood work before, during and after is how problems are caught early.
- Androgens tend to lower HDL, raise LDL and thicken the blood: HDL Cholesterol, LDL Cholesterol, Hematocrit, Hemoglobin
- Kidney strain: Moderate: Creatinine, BUN, eGFR
- Shuts down natural production (PCT needed): Total Testosterone, LH, FSH
Related compounds
- Deca-Durabolin (Nandrolone Decanoate)
- Trenbolone Acetate
- Trenbolone Enanthate
- Parabolan (Trenbolone Hexahydrobenzylcarbonate)
Questions
What is the half-life of NPP (Nandrolone Phenylpropionate)?
About 3-4 days. Half-life is the time for the level in the blood to fall by half.
How long is NPP (Nandrolone Phenylpropionate) detectable?
Testing windows of 12-18 months are reported, depending on the test and the person.
Is NPP (Nandrolone Phenylpropionate) legal?
Schedule 4 (South Africa) / Schedule III (USA). Laws differ by country and change; check the rules where you live.
What blood tests matter with NPP (Nandrolone Phenylpropionate)?
Based on its properties, these markers are commonly monitored: HDL Cholesterol, LDL Cholesterol, Hematocrit, Hemoglobin, Creatinine, BUN, eGFR, Total Testosterone, LH and FSH. A doctor can order and interpret them.
What are the side effects of NPP (Nandrolone Phenylpropionate)?
Estrogenic: gynecomastia (progestin activity), water retention and increased blood pressure. Androgenic: acne and hair loss (less than testosterone). Heart and blood vessels: ldl increase, hdl decrease and increased blood pressure.
For information only, not medical advice. MyoStats is a tracking tool used at your own discretion. Speak to a doctor before changing your training, diet, medication or anything you take.