---
title: "Testosterone Undecanoate (Injectable)"
description: "Very long ester, mainly used in medical TRT (Nebido). The extremely long half-life (21 days) makes adjustments difficult. 1 injection every 10-12 weeks. Poorly suited to classic bodybuilding cycles."
lang: en
dateModified: 2026-05-25
canonical: https://anaprotokol.com/en/molecule/test-undecanoate-injectable
---

# Testosterone Undecanoate (Injectable)

Very long ester, mainly used in medical TRT (Nebido). The extremely long half-life (21 days) makes adjustments difficult. 1 injection every 10-12 weeks. Poorly suited to classic bodybuilding cycles.

**Catégorie** : Stéroïde injectable
**Voie d'administration** : Injectable
**Demi-vie** : 21 jours
**Détection** : 3 mois
**Ratio anabolique** : 100
**Ratio androgénique** : 100
**Aromatisation** : Oui
**Progestine** : Non
**Hépatotoxique** : Non
**PCT requise** : Oui

**Autres noms** : Nebido, Aveed, Test U

## Effets
- TRT comfort (1 injection every 3 months)
- Stable levels without peaks
- Moderate lean mass

## Effets secondaires
- Difficult dose adjustment
- Aromatization
- Acne
- HPTA shutdown

## Suppléments de soutien
- AI
- Omega-3

## Synergies
- HCG (TRT)
- TRT use primarily

## À éviter
- Bodybuilding use (dose too hard to control)
- No quick adjustments possible

## Dosage masculin
- Débutant : 1000 mg / 12 sem (TRT)
- Intermédiaire : 1000 mg / 10–12 sem
- Avancé : 1000 mg / 8 sem

## Dosage féminin
Not recommended

**Fréquence** : 1× every 10-12 weeks (TRT)