Test E 300mg is an injectable compound with a slow rate of release due to the larger Enanthate ester attached to the Testosterone molecule. It is an esterified variant of Testosterone.
Testosterone that is un-esterified holds a very short half-life, making its use very inconvenient and impractical. The Enanthate ester expands Testosterone's half-life to that of 10 days, and blood plasma levels of the hormone remain elevated for a total period of approximately 2 – 3 weeks.
Testosterone itself is considered the most natural and safest anabolic steroid. It is the most versatile and flexible anabolic steroid in terms of how it can be utilised in cycles. Following a deep intramuscular injection, once in the bloodstream, the ester is removed to yield free (active) testosterone. The drug is designed to provide a sustained release of testosterone into the bloodstream for approximately 2 to 3 weeks. The half-life of testosterone enanthate is approximately 8 days after injection. Usually required at least every two weeks in order to maintain normal physiological levels of testosterone during androgen replacement therapies.