Test D 250mg/mL in a 10mL vial with grapeseed oil carrier. Premium injectable with consistent dosing and secure packaging.
Format10mL Vial
Concentration250mg/mL
CarrierGrape Seed Oil
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HPLC verified. COA on file for this batch
Ships from within Canada; No Customs
Discreet plain packaging; always
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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.
Testosterone Decanoate is the longest acting single testosterone ester available with a half-life of approximately 14–16 days, significantly longer than Testosterone Enanthate (7–10 days) or Cypionate (8–12 days). This extended half-life allows once weekly or even once every 10 day administration while maintaining stable supraphysiological testosterone levels. It is the longest ester component in Sustanon 250, responsible for the sustained testosterone release profile of that blend. As a standalone compound it is less commonly researched than Enanthate or Cypionate but offers the most infrequent injection schedule of any single testosterone ester.
The primary advantage of Testosterone Decanoate is its exceptionally long half-life; allowing the least frequent administration schedule of any testosterone ester while maintaining stable serum testosterone levels. For research protocols where minimizing injection frequency is a priority, Testosterone Decanoate offers once weekly or once every 10 day administration without the hormonal troughs associated with less frequent injection of shorter esters. The trade off is a slower onset compared to Enanthate or Cypionate, and a longer clearance time following the end of a research protocol. PCT should be delayed by approximately 3 weeks after the last injection.
Due to its 14–16 day half-life, Testosterone Decanoate can be administered once weekly or once every 10 days while maintaining stable serum testosterone levels. Once-weekly administration at 250mg is the most practical research schedule; providing consistent testosterone elevation throughout the protocol without the accumulation that would occur with more frequent dosing. This 10mL vial at 250mg/mL contains 2500mg total. Sufficient for 10 weekly injections covering a full 10 week research cycle.
Due to its exceptionally long half-life of 14–16 days, Testosterone Decanoate takes significantly longer to clear than shorter testosterone esters. PCT should typically begin approximately 3 weeks after the last Testosterone Decanoate injection. Compared to 2 weeks for Testosterone Enanthate or Cypionate. This extended clearance window should be factored into research cycle planning, particularly for protocols where rapid HPG axis recovery is desired following cycle completion.
Yes! This batch has been independently HPLC tested by an accredited third party laboratory confirming concentration accuracy at 250mg/mL and compound identity as Testosterone Decanoate. A certificate of analysis is available.
