Arimidex vs Testosterone
Arimidex and Testosterone are compared here on the things that actually differ between them: what class each belongs to, what each acts on, how each is supplied and what each costs per milligram. Where the registry has no figure for one of them the row is left out rather than filled in.
Side by side
| Arimidex | Testosterone | |
|---|---|---|
| Class | Non-steroidal aromatase inhibitor | Endogenous androgen; the reference androgen |
| Acts on | A reversible, competitive inhibitor of the aromatase enzyme, reducing conversion of androgens to oestrogens. | 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. |
| Supplied as | Oral tablet. | Oil solution for intramuscular injection, supplied as single esters or blends. Common esters: propionate, isocaproate, enanthate, cypionate, undecanoate. |
| Half-life | Approximately 50 hours. | Determined entirely by the ester. Propionate roughly 0.8 days; enanthate about 4.5 days; cypionate about 5 days; undecanoate substantially longer. |
| Storage | Cool, dry, dark. | Room temperature, out of direct light. Crystallisation in cold conditions is a physical change, not degradation, and redissolves with gentle warming. |
| Listings | 1 | 9 |
| Price from | £25 | £18 |
What actually differs
The clearest difference is class: Arimidex is a Non-steroidal aromatase inhibitor, Testosterone is an endogenous androgen; the reference androgen. They are not supplied the same way. Arimidex comes as an oral tablet, Testosterone as an oil solution for intramuscular injection, supplied as single esters or blends. Common esters: propionate, isocaproate, enanthate, cypionate, undecanoate. Half-life differs as well: Approximately 50 hours for Arimidex against Determined entirely by the ester. Propionate roughly 0.8 days; enanthate about 4.5 days; cypionate about 5 days; undecanoate substantially longer for Testosterone.
Arimidex - Pharmain stock£25
Quanta Pharma Fem-Testin stock£18
Quanta Pharma Testosterone Propionatein stock£25
Quanta Pharma Testosterone Isocaproatein stock£30
Quanta Pharma Testosterone Enanthatein stock£34
Availability checked 2026-09-09. The product page carries live stock.