Description
This Grunenthal undecanoate at 1000 mg provides the slowest-release testosterone in routine clinical use. Injection volume is large — inject slowly to minimise POME (post-injection pulmonary oil microembolism) risk. Clinical TRT rather than athletic cycling.
Key Benefits
- Ultra-long ester — monthly or twice-monthly pinning at clinical doses
- Castor-oil depot — slow, smooth release over weeks
- Used for TRT in patients averse to weekly injections
- Not common in performance cycles — ester too long for tight control
- Aromatisation same as other testosterone esters
- Each unit dosed at 1000 mg — see Recommended Dosage below for protocol-specific intake
Recommended Dosage
Clinical TRT dosing: 1000 mg every 10–14 weeks (Nebido protocol) or every 2 weeks for faster saturation. Performance dosing uncommon — the ultra-long ester makes cycle management difficult.
How It Works
Testosterone esterified to undecanoic acid (11-carbon chain) in castor-oil carrier. The long chain and viscous oil together produce extremely slow depot release. Active hormone identical to other testosterone forms.
Pharmacokinetics
Plasma half-life approximately 20–30 days from the castor-oil depot. Steady-state requires 3–4 injections (10+ weeks). Clearance after stopping also prolonged — PCT timing shifts to 6+ weeks post-last-injection.
Potential Side Effects
Slow onset means side-effects develop gradually rather than spiking. Same core testosterone profile: oestrogenic, androgenic, HPTA suppression. Bloodwork at week 6 and 10 to catch trend drift.
Cycle & Stacking Guide
TRT-oriented. Not generally used for performance due to slow ester kinetics — Test E or C preferred. If cruising on undecanoate, monitor E2 and hematocrit at week 10 after each injection.
Manufacturer Notes
Grunenthal is a German pharmaceutical company with a long track record. Their testosterone undecanoate product is dispensed through regulated pharmacy channels.
Storage & Handling
Store upright at 15–25 °C in the original box, protected from light and moisture. Oil-based injectables are shelf-stable for the duration printed on the vial when kept at controlled room temperature. Do not refrigerate — cold thickens the carrier oil and makes drawing/injecting harder. Keep out of reach of children. For research and educational purposes only.
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