- NPP is nandrolone with a short phenylpropionate ester, acting faster and clearing sooner than Deca.
- Its half-life is about 2 to 3 days, so it’s injected every two to three days.
- Effects are the same as Deca: steady gains, joint comfort, strong suppression and possible libido problems.
- The advantage is control: if side effects appear, they fade within about a week of stopping.
NPP was once sold as Durabolin, the faster sibling of Deca-Durabolin. It delivers the same hormone, nandrolone, on a shorter timescale. This guide explains when that matters.
NPP vs Deca
| NPP | Deca (decanoate) | |
|---|---|---|
| Half-life | About 2 to 3 days | About 6 to 12 days |
| Injections | Every 2 to 3 days | Once a week |
| Steady levels reached | Within about a week | Several weeks |
| Clears after stopping | About a week | Several weeks |
| Injection site pain | More common | Less common |
What users report
- Steady muscle and strength gains with some water
- Joint comfort, consistent with nandrolone’s effects on collagen
- Faster onset than Deca
Side effects
- Strong suppression of natural testosterone and sperm production
- Libido and erection problems, linked to low testosterone and nandrolone’s progestogenic and prolactin effects
- Lower HDL, higher blood pressure and hematocrit
- Some water retention and gynecomastia risk
- Long detection times: nandrolone metabolites can show on drug tests for months
See our Deca guide for more detail on nandrolone.
Bloodwork in Canada
Check testosterone, estradiol, prolactin, a complete blood count, lipids and blood pressure before and during use, and testosterone, LH and FSH afterwards. Ask your family doctor or book at LifeLabs or Dynacare.
Legal status in Canada
Nandrolone is an anabolic steroid, listed in Schedule IV of the Controlled Drugs and Substances Act. Possessing it for personal use isn’t an offence; trafficking, importing and exporting without authorization are.
Buying NPP in Canada
We stock NPP Genetix Pharma, 100 mg/ml in 10 ml vials. See live prices on our injectables page.
Frequently asked questions
Is NPP better than Deca?
Same hormone. NPP acts and clears faster but needs more frequent injections.
How often is NPP injected?
Every two to three days, given its half-life of about 2 to 3 days.
Does NPP cause libido problems?
It can, like Deca, through suppressed testosterone and nandrolone’s progestogenic effects.
Is NPP legal in Canada?
It’s Schedule IV under the CDSA. Personal possession isn’t an offence; trafficking, importing and exporting are.
Products mentioned in this guide
This article is general information for adults in Canada, not medical advice. Talk to a doctor or pharmacist before using any prescription drug, anabolic steroid or research compound, and get bloodwork done. If you’re in crisis, call or text 9-8-8 (Suicide Crisis Helpline) any time.
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