What is Testosterone Suspension?
Testosterone Suspension (Unesterified aqueous testosterone suspension (injectable)) is pure testosterone — C₁₉H₂₈O₂, MW 288.4 — without any ester modification, suspended in aqueous vehicle. Unesterified testosterone has the fastest onset of any injectable testosterone form (peak ~2–4h, active ~24–48h). Directly available for immediate AR activation without ester hydrolysis step. Fully aromatises to oestradiol via CYP19A1.
Research Applications
Immediate Androgen Delivery
No ester hydrolysis required — fastest-acting injectable testosterone for acute AR activation studies
Androgen Receptor Biology
Direct unmodified testosterone AR binding and nuclear signalling
Pharmacokinetic Reference
Pure testosterone PK reference compound for ester comparison studies
Aromatisation Research
Complete CYP19A1 aromatisation — rapid oestradiol elevation studies
HPG Axis Feedback
Rapid onset suppression of 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 |
2–8°C | Do not freeze |
| 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
2–8°C | Do not freeze
