Testosterone Base (No Ester) 100mg/mL Injectable | 20-Vial Kit
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Testosterone Base (No Ester) 100mg/mL — unesterified oil-suspended testosterone, immediate-onset, 20-vial kit. ≥99% HPLC purity, MS confirmed, Janoshik COA. Research use only.
* The information on this page is a summary and is not intended to cover all available information about this medication. It does not cover all possible uses, directions, precautions, drug interactions or adverse effects and is not a substitute for the expertise and judgement of your healthcare professional.
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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 | Oil-based suspension (unesterified) |
| Concentration | 100mg/mL |
| CAS | 58-22-0 |
| Molecular Formula | C₁₉H₂₈O₂ |
| MW | 288.4 Da |
| Purity | ≥99% by HPLC — every batch |
| Identity | MS molecular weight confirmed — every batch |
| COA | Janoshik-independent, publicly verifiable |
| Vehicle | Pharmaceutical-grade carrier oil + benzyl alcohol/benzoate |
| Aromatisation | Full — converts to oestradiol via CYP19A1 |
| Storage | Room temp sealed | 2–8°C recommended |
| Shelf Life | 24 months (unopened) |
Certificate of Analysis (COA)
Frequently Asked Questions
Frequently asked questions
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A seemingly elegant design can quickly begin to bloat with unexpected content or break under the weight of actual activity. Fake data can ensure a nice looking layout but it doesn’t reflect what a living, breathing application must endure. Real data does.
Websites in professional use templating systems. Commercial publishing platforms and content management systems ensure that you can show different text, different data using the same template. When it’s about controlling hundreds of articles, product pages for web shops.
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