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 |
C₂₅H₃₈O₃, MW 390.6 |
| Purity |
≥99% by HPLC — every batch |
| CAS Number |
15262-86-9 |
| Molecular Weight |
MS molecular weight confirmed — every batch |
| Specification |
≥99% by HPLC — every batch |
| Shelf Life |
24 months (unopened) |
| Storage |
Room temperature sealed | cool, dry storage |
| Manufacture |
In-house synthesis — Qingdao, China |
| Brand |
China |
Certificate of Analysis (COA)
Frequently Asked Questions
How do I reconstitute this peptide?
QSC raw powder compounds are supplied as bulk crystalline or amorphous powder in a sealed, labelled container at the stated quantity. No reconstitution is required — the powder is ready for weighing and use in research applications.
How should this peptide be stored?
Store at room temperature (15–25°C) in a cool, dry place away from moisture, heat, and direct light. Keep in the original sealed container. Properly stored raw powder remains stable for 2–3 years.
What purity is this QSC compound and how is it verified?
All QSC raw powder compounds are tested to ≥99% purity by HPLC on every production batch, with MS-confirmed identity. COA is published on the product page and independently verifiable at verify.janoshik.com.
🧪 Peptide Research Tools: Use QSC's free
peptide calculators — reconstitution, BAC water, dosing, half-life, and mixing charts.
🌍 Domestic shipping: 🇺🇸 USA 5–7 days
🌏 International shipping: 7–14 days
⚠️ RESEARCH USE ONLY — NOT FOR HUMAN CONSUMPTION
QSC products are strictly for in vitro and in vivo laboratory research.
Safety & Handling
🚫
Not for Human Use
These compounds are for research only.
🥽
PPE Required
Always use appropriate protective equipment.
❄️
Storage Compliance
Follow product-specific storage conditions.
Product-Specific Storage
Room temperature sealed | cool, dry storage
