What is Sustanon 400 (Testosterone Propionate 48mg + Testosterone Phenylpropionate 96mg + Testosterone Isocaproate 96mg + Testosterone Decanoate 160mg)?
Sustanon 400 is a high-concentration quad-ester testosterone preparation at 400mg/mL — a 60% increase over the original Sustanon 250 formula. Maintains the same four-ester ratio (propionate/phenylpropionate/isocaproate/decanoate) in proportional scaling. Provides equivalent multi-phase release kinetics at higher concentration, enabling higher testosterone delivery per injection volume. Research use only.
Research Applications
High-Concentration Testosterone PK
400mg/mL vs 250mg/mL — dose-volume normalised serum AUC comparison
Multi-Phase Androgen Kinetics
Four-ester serum profiling at increased total concentration
HPG Axis Suppression
Dose-dependent LH/FSH suppression, GnRH pulsatility, spermatogenesis inhibition
Volume-Dose Tolerability
Injection site bioavailability, tissue depot characteristics at 400mg/mL
Sustained Androgen Research
Long-duration testosterone exposure modelling via decanoate-dominant formulation
Quick Specs
| Form | Injectable solution |
| Concentration | 400mg/mL |
| CAS | 57-85-2 / 1255-49-8 / 15262-86-9 / 5721-91-5 |
| Molecular Formula | TestP C₂₂H₃₂O₃ + TestPP C₂₈H₃₆O₃ + TestIC C₂₅H₃₆O₃ + TestD C₂₉H₄₄O₃ |
| MW | 344.5 / 420.6 / 388.6 / 456.7 |
| Purity | ≥99% by HPLC — every batch |
| Identity | MS confirmed — every batch |
| COA | Janoshik-independent, publicly verifiable |
| Vehicle | Pharmaceutical-grade oil (USP/BP) |
| Storage | Room temperature 15–25°C | Protect from light | Do not freeze |
| Shelf Life | 24 months (unopened) |
