Deca 500 by Zyvex Pharmaceuticals
What Is Deca 500?
Deca 500 from Zyvex Pharmaceuticals is nandrolone decanoate at a concentrated 500 mg per ml, 10 ml per vial. It is the same well-known nandrolone as the classic deca, packed at double the usual concentration so that a full weekly dose fits in a single 1 ml injection.
The 500 mg format is built for experienced mass phases. One injection of 1 ml delivers 500 mg, which removes the volume and the extra injections that lower-concentration nandrolone needs. It stays a suppression-heavy 19-nor compound, so the rules are the same: always with a testosterone base, with prolactin and estrogen watched, and with a long enough PCT.
Deca 500 Dosage
With 500 mg per ml, dosing becomes simple volume math for the advanced ranges.
| Protocol | Weekly Dose | Schedule |
|---|---|---|
| Solid mass, experienced | 500 mg | 1 ml once weekly |
| Advanced bulking | 500-750 mg | 1-1.5 ml split |
| Heavy phase | 750-1000 mg | Split into 2 injections Experienced only |
One 10 ml vial covers 10 weeks at 500 mg weekly. Cycles run 12-16 weeks and require full PCT planning for nandrolone's long ester.
Deca 500 Stacks
The high-dose nandrolone format is built for serious mass phases on a testosterone base. The stacks below include the support a long 19-nor run needs.
| Stack | Goal |
|---|---|
| Deca 500 + Enanthate 250 | Heavy mass blend |
| Deca 500 + Enanthate 250 + Oxymetholone | Serious bulking with oral kickstart |
| Deca 500 + Cabergoline | Prolactin control on a 19-nor run |
| Deca 500 + Aromasin | Estrogen control alongside the base |
| Deca 500 + Nolvadex or Clomid | PCT after a long-ester cycle |
Deca 500 Side Effects
The dose is higher, which makes the 19-nor side profile louder, not different.
- Suppression - total shutdown with slow clearance; plan a real PCT.
- Cardio - lipids and blood pressure need checks on longer runs.
- Not for beginners - the 500 mg format assumes prior cycle experience.
This page is a product reference for research purposes. It does not replace medical advice, bloodwork review or local laws.
What is Deca 500?
Deca 500 is the high-concentration Zyvex Pharmaceuticals nandrolone decanoate at 500 mg per ml, 10 ml per vial. One vial holds 5000 mg for serious mass phases.
Why choose Deca 500 over Deca 300?
The higher concentration halves the injection volume for the same weekly dose. It is built for experienced mass phases where 500 mg a week is the reference.
How often should you inject Deca 500?
Nandrolone decanoate runs once weekly; at 500 mg/ml a full 500 mg dose is exactly 1 ml per injection.
How long does Deca stay in your system?
The decanoate ester keeps nandrolone detectable for up to 18 months. Plan testing and recovery windows around the long clearance.
What is the right Deca 500 dosage?
Advanced mass runs use 500 mg weekly, with experienced users going higher. One 10 ml vial covers 10 weeks at the reference dose.
What are the side effects of Deca 500?
Prolactin, water and suppression are the 19-nor watchpoints, louder at high doses. Cabergoline and an AI are the standard counters.
Does Deca 500 cause erectile dysfunction?
Libido issues on nandrolone usually trace to prolactin or estrogen imbalance. Managing both with Cabergoline and an AI keeps function normal.
How long does Deca 500 take to kick in?
Like all nandrolone decanoate, effects build slowly - expect visible changes from weeks 5-6 of the run.
Do you need a PCT after Deca 500?
Yes. High-dose nandrolone suppresses hard and clears slowly, so a longer SERM-based PCT is required after the cycle.
Where to buy Deca 500 online?
Zyvex Pharmaceuticals Deca 500 is available in this shop as 500 mg/ml, 10 ml per vial, with international and domestic shipping.
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