Description
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.
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