Nandrolone Decanoate (Deca)
19-nor injectable (Deca-Durabolin)
Also known as Deca, deca durabolin, nandrolone, Nandrolone Decanoate
Half-life
~6–12 days
What is Nandrolone Decanoate (Deca)?
19-nor testosterone with strong anabolic effects and low androgenic ratio. Long ester.
How Nandrolone Decanoate (Deca) works
Binds androgen receptors with less androgenic activity than testosterone; also increases synovial fluid and collagen synthesis, making it uniquely beneficial for joint pain relief.
Benefits & uses
- Muscle mass
- Joint comfort/collagen (reputation)
- Long-acting, slow steady gains
Common uses: Joint pain relief, mass building, recovery, strength. Very popular in bulking stacks.
Nandrolone Decanoate (Deca) dosage
Protokol doesn't recommend doses for prescription or controlled compounds. Any figures below are reference or observational reports — dosing should be set with a qualified clinician.
- Commonly reported
- Observational only; long half-life means slow onset/offsetObservational use reports — not a recommendation.
Nandrolone Decanoate (Deca) half-life
~6–12 days (decanoate ester)
Nandrolone Decanoate (Deca) side effects
'Deca dick' (libido suppression), strong suppression, progesterone elevation, slow clearance.
- 'Deca dick' — libido suppression from 19-nor progesterone elevation
- Severe HPG axis suppression
- Long clearance time (may take months to clear)
- Progesterone elevation — may require cabergoline
- Hematocrit and cholesterol changes
- Strong HPTA suppression (can be prolonged / 'Deca dick')
- Raised prolactin → sexual dysfunction/gyno
- Sexual side effects
- Lipid shift
Warnings & monitoring
- Requires bloodwork INCLUDING PROLACTIN + medical monitoring
- Prolactin management may be needed (see cabergoline)
- Notoriously long/harsh recovery — careful PCT planning
- Long detection window
Preparation & storage
- Storage
- Room temperature (15–30 °C) in sealed vials. Stable for years unopened.
Nandrolone Decanoate (Deca) interactions
with Trenbolone
Avoid · severeNandrolone and Trenbolone are both 19-nor androgens with strong progestenic activity. Stacking them dramatically increases the risk of prolactin-induced gynecomastia, sexual dysfunction, and suppression — avoid without experienced supervision.
Timing: Do not stack two 19-nor compounds
with Trenbolone
Caution · highBoth trenbolone and nandrolone are 19-nor steroids with progestogenic activity. Combining them elevates prolactin significantly and can cause sexual dysfunction. Use cabergoline if stacked.
Timing: Avoid combining both 19-nor compounds in the same cycle
with Cabergoline
Compatible19-nor compounds elevate prolactin; cabergoline mitigates the libido/erection issues commonly reported on Deca.
Timing: Cabergoline 0.25mg 2×/week during nandrolone cycle
with Cabergoline
Compatible · lowNandrolone raises prolactin via progesterone receptor activity. Cabergoline (a dopamine agonist) controls prolactin-related side effects including sexual dysfunction and gyno.
Timing: Start cabergoline 0.25mg 2×/week when running nandrolone above 300mg/week
with Testosterone
CompatibleA classic mass-building stack; testosterone acts as the base while Nandrolone adds anabolic volume — manage 19-nor progesterone elevation with cabergoline if needed.
Timing: Inject on the same or separate days; monitor estrogen and prolactin
Commonly stacked with
Track Nandrolone Decanoate (Deca) in Protokol.
Log doses, model half-lives, check interactions, and line it all up against your bloodwork. Free on iPhone and Android.
