What is Testosterone Undecanoate?
Testosterone Undecanoate (Ultra-long-acting esterified testosterone (injectable)) is a testosterone undecanoate ester — C₃₀H₄₈O₃, MW 456.7. Longest-chain testosterone ester providing ultra-extended release (peak ~7 days, active ~10–14 weeks in clinical use). Stored in lymphatic depot before systemic release. Free testosterone activates the androgen receptor (AR). Minimal aromatisation relative to shorter esters at equivalent free-T levels.
Research Applications
Ultra-Long-Acting Androgen Depot
Lymphatic depot storage and extended-release pharmacokinetics research
TRT Research Model
Long-interval testosterone restoration with reduced injection frequency
Androgen Receptor Biology
AR binding, nuclear translocation, androgen-responsive gene expression
HPG Axis Feedback
Prolonged suppression kinetics of the hypothalamic-pituitary-gonadal axis
Lymphatic Drug Delivery
Lymphatic absorption model for lipophilic injectable depot formulations
Quick Specs
| Form |
C₃₀H₄₈O₃ |
| Purity |
≥99% by HPLC — every batch |
| CAS Number |
5949-44-0 |
| Molecular Weight |
MS molecular weight confirmed — every batch |
| Specification |
≥99% by HPLC — every batch |
| Shelf Life |
24 months (unopened) |
| Storage |
Room temp sealed | 2–8°C recommended |
| Brand |
China |
Frequently Asked Questions
How do I reconstitute this peptide?
QSC Testosterone esters are supplied as ready-to-use oil-based injectable solutions — no reconstitution required. Each vial contains the stated concentration in pharmaceutical-grade carrier oil. Warm the vial briefly in your hand before drawing.
How should this peptide be stored?
Store at room temperature (15–25°C), away from direct sunlight. Oil-based testosterone solutions are stable for 2–3 years properly stored. Do not refrigerate as this can cause crystallisation of the ester in the oil.
What purity is this QSC compound and how is it verified?
QSC Testosterone injectable solutions are ≥99% HPLC pure with MS-confirmed identity on every batch. 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 temp sealed | 2–8°C recommended
