Test D 250mg/mL – Grape Seed Oil– 10mL Vial

Testosterone Decanoate is the longest acting single ester testosterone compound available for research, with an estimated half life of approximately 15 days; the most extended active window among all individual testosterone esters. CSD’s formulation delivers 250mg/mL in a 10mL multi dose vial using grapeseed oil as the carrier base, a light, low viscosity oil with excellent flow characteristics and a clean tolerability profile that makes it particularly well suited to higher concentration formulations.

The decanoate ester’s exceptionally long half life means blood concentration levels remain elevated for an extended period following each administration, making it the least frequently administered single ester testosterone in documented research protocols. This prolonged release profile distinguishes Testosterone Decanoate from the more commonly researched Enanthate and Cypionate esters; where those compounds clear within 7–12 days, Decanoate maintains active presence nearly twice as long. For researchers examining sustained testosterone exposure over extended observation windows, this makes it a uniquely valuable compound in the testosterone ester family.

Grapeseed oil as a carrier brings meaningful advantages worth noting. Its low viscosity relative to cottonseed and sesame oil results in smoother administration and reduced injection site pressure, particularly relevant at the 250mg/mL concentration of this formulation. It also carries a favorable oxidation profile, contributing to formulation stability over the vial’s usage period.

Every batch of CSD’s Testosterone Decanoate is third party lab tested for concentration accuracy and purity prior to release, with COA documentation available on request. Canada Steroid Depot has supplied Canadian customers with consistently verified, accurately dosed compounds for years, and this formulation is one of the more specialized offerings in our injectable testosterone range. All orders ship discreetly across Canada in plain, unmarked packaging with no identifying information on the exterior.

Store at room temperature away from direct light and heat. Do not freeze. Intended for research purposes only.

Commonly researched alongside an aromatase inhibitor. Browse CSD’s full injectable testosterone range and PCT compounds for complete protocol sourcing.