What is Testosterone Isocaproate?
Testosterone Isocaproate is a branched-chain medium-duration ester (~7–9 days). Third component of Sustanon blends. The isocaproate (4-methylpentanoate) ester provides intermediate release kinetics between phenylpropionate and decanoate. Research use only.
Research Applications
Sustanon Component Research
Isolated isocaproate contribution to multi-ester blend serum testosterone profile
Medium-Duration Ester PK
Isocaproate hydrolysis kinetics, depot residence, 7–9 day active window
Branched Ester Pharmacology
Branched vs linear ester effect on esterase substrate affinity and hydrolysis rate
Multi-Ester Formulation
Isocaproate as bridge component between fast and ultra-long esters in blends
Comparative Ester Series
TestPP vs TestIC vs TestD — progressive ester chain length effects on PK
Quick Specs
| Form | Raw bulk powder (crystalline/amorphous) |
| Purity | ≥99% by HPLC — every batch |
| CAS Number | 15262-86-9 |
| Molecular Formula | C₂₅H₃₈O₃, MW 390.6 |
| Identity | MS molecular weight confirmed — every batch |
| Compound Type | Medium-Ester Testosterone (Isocaproate) |
| COA | Janoshik-independent, publicly verifiable |
| Manufacture | In-house synthesis — Qingdao, China |
| Storage | Room temperature sealed | cool, dry storage |
| Shelf Life | 24 months (unopened) |
