Test + Deca is the oldest lean bulk protocol in the book for a reason. Deca’s slow ester gives you 14-16 weeks of stable anabolic signal. The testosterone base handles everything Deca does poorly (libido, aromatization coverage, HPTA signal). Joint health improves. You put on steady, dense mass.
The protocol
| Week | Testosterone E | Nandrolone Decanoate | Ancillaries |
|---|---|---|---|
| 1 | 600mg (front-load) | 600mg (front-load) | Anastrozole 0.5mg EOD · Cabergoline 0.25mg 2×/week |
| 2–16 | 500mg/week | 400mg/week | Anastrozole 0.5mg EOD · Caber 0.25mg 2×/week |
| 17–18 | Off | Off | Continue caber if prolactin elevated |
| 19–22 (PCT) | — | — | Clomid 50/50/25/25mg · Nolvadex 40/20/20/10mg |
Why 16 weeks minimum
Decanoate half-life is ~6-12 days. Steady-state requires roughly 5 half-lives — 30 to 60 days of pinning before serum levels plateau. An 8-week Deca cycle is mostly 8 weeks of ester depot building up with a limited anabolic window. 16 weeks gives you 10-12 weeks at full serum saturation.
The front-load week 1 compresses saturation from 4-6 weeks to 2-3 weeks.
Prolactin management
Nandrolone is progestagenic. Prolactin rises on deca-containing cycles independent of estradiol. Symptoms of elevated prolactin: low libido despite good test numbers, nipple sensitivity that doesn’t respond to Nolvadex, potential lactation at high levels. Cabergoline at 0.25mg twice weekly keeps prolactin in range for most users.
Pull prolactin labs at week 6 to confirm your caber dose is adequate. Target: prolactin < 15 ng/mL.
The “Deca dick” myth
Deca doesn’t cause sexual dysfunction on its own. What happens: nandrolone binds to androgen receptors but produces weaker DHT-equivalents in sexual tissue than pure testosterone does. If your test-to-deca ratio is too low (e.g. 300mg test / 400mg deca), you get all the AR occupation with insufficient testosterone signal for libido.
Rule: test > deca dose. Always. 500/400 works. 300/400 doesn’t.
Bloodwork schedule
- Baseline: Full panel including prolactin (baseline for comparison later)
- Week 6: Total T, free T, E2 sensitive, prolactin, ALT/AST, lipid panel, hematocrit
- Week 12: E2, prolactin, hematocrit
- Week 22 (post-PCT): Full recovery panel
Detection considerations
Nandrolone metabolites (19-norandrosterone) stay detectable in urine for up to 18 months. Relevant for athletes subject to WADA testing or random workplace drug screens in sports-related fields. If detection is a concern, this isn’t your stack.
What to expect
- Week 1–3: Test effects kick in early (libido, mood, training drive). Deca still building saturation.
- Week 4–6: Joint relief from nandrolone’s collagen synthesis bump. Training volume tolerance up.
- Week 7–12: Peak lean mass phase. Visible fullness, better recovery, strength climbing.
- Week 13–16: Consolidation. Plateau is normal — you’re at steady-state and diet is doing most of the work now.
- Week 17–18 (off): Test E clears first. Deca’s slow clearance means PCT has to wait.
Expect 8-12kg of retained lean mass over the full cycle with disciplined nutrition. Water retention is real but dose-dependent; with proper AI management it’s manageable.
When to skip this stack
- History of prolactin issues
- Sensitive to estrogenic sides (run Primo or EQ instead)
- Subject to testing (19-nor detection window)
- First or second cycle (Deca adds complexity; master Test first)