What is Testosterone Base (No Ester)?
Testosterone Base (Unesterified testosterone in oil suspension — injectable) is pure testosterone — C₁₉H₂₈O₂, MW 288.4 — without any ester, formulated in oil-based suspension. Unlike testosterone suspension (aqueous), the oil-based format slows release slightly vs aqueous. No ester hydrolysis required — direct AR activation. Ultra-short active window (peak ~4–8h in oil, active ~24–48h). Fully aromatises via CYP19A1. Research reference compound for all testosterone ester pharmacokinetic comparisons.
Research Applications
Unesterified Testosterone Reference
Pure testosterone PK reference — no ester hydrolysis step, direct AR activation
Androgen Receptor Biology
Direct testosterone AR binding without ester modification confounds
Pharmacokinetic Ester Comparison
Oil-base vs aqueous suspension vs esterified forms — onset and duration comparison
Aromatisation Research
Complete CYP19A1 oestradiol conversion — rapid oestrogenic activity onset
HPG Axis Research
Rapid suppression and recovery kinetics of the hypothalamic-pituitary-gonadal axis
Quick Specs
| Form |
C₁₉H₂₈O₂ |
| Purity |
≥99% by HPLC — every batch |
| CAS Number |
58-22-0 |
| 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
