Testosterone
Testosterone is an endogenous androgen; the reference androgen. The principal endogenous androgen in men, acting at the androgen receptor and, via aromatase, as the substrate for endogenous oestradiol. Supplied as esters, which alter release rate but not the parent hormone delivered.
Class and mechanism
Testosterone is an endogenous androgen; the reference androgen. The principal endogenous androgen in men, acting at the androgen receptor and, via aromatase, as the substrate for endogenous oestradiol. Supplied as esters, which alter release rate but not the parent hormone delivered.
How it is supplied
Testosterone is supplied as an oil solution for intramuscular injection, supplied as single esters or blends. Common esters: propionate, isocaproate, enanthate, cypionate, undecanoate. Reported half-life: Determined entirely by the ester. Propionate roughly 0.8 days; enanthate about 4.5 days; cypionate about 5 days; undecanoate substantially longer. Storage: Room temperature, out of direct light. Crystallisation in cold conditions is a physical change, not degradation, and redissolves with gentle warming.
Worth knowing
Blends such as Sustanon 250 combine several esters to produce a composite release curve from a single injection.
| Listing | Strength | Price | Cost per mg | Stock |
|---|---|---|---|---|
| Quanta Pharma Fem-Test | - | £18 | - | in stock |
| Quanta Pharma Testosterone Propionate | - | £25 | - | in stock |
| Quanta Pharma Testosterone Isocaproate | - | £30 | - | in stock |
| Quanta Pharma Testosterone Enanthate | - | £34 | - | in stock |
| Quanta Pharma Test 400 | - | £38 | - | in stock |
| Quanta Pharma Sustanon 250 | - | £29 | - | out of stock |
| Quanta Testosterone Undecanoate (TRT Choice) | - | £30 | - | out of stock |
| Quanta Pharma Test 350 | - | £32 | - | out of stock |
| Quanta Pharma Testosterone Cypionate | - | £32 | - | out of stock |
Quanta Pharma Fem-Testin stock£18
Quanta Pharma Testosterone Propionatein stock£25
Quanta Pharma Testosterone Isocaproatein stock£30
Quanta Pharma Testosterone Enanthatein stock£34
Quanta Pharma Test 400in stock£38
Quanta Pharma Sustanon 250out of stock£29
Quanta Testosterone Undecanoate (TRT Choice)out of stock£30
Quanta Pharma Test 350out of stock£32
Quanta Pharma Testosterone Cypionateout of stock£32
Availability checked 2026-09-08. The product page carries live stock.