https://www.medzsafe.com/product/sustanon-250/

Sustanon 250 is the brand name for a specific subset of injectable testosterone medications. Sustanon 250 is a combination of four different kinds of testosterone esters, which are substances that, following injection, release testosterone into the circulation at various rates. These esters consist of:

Testosterone Propionate
Testosterone Phenylpropionate
Testosterone Isocaproate
Testosterone Decanoate

Sustanon 250 offers a dual-phase release of testosterone since it combines these various esters. The longer-acting esters (isocaproate and decanoate) sustain the initial quick rise in testosterone levels caused by the shorter-acting esters (propionate and phenylpropionate) over the course of a few weeks.

Low testosterone patients using HRT are given Sustanon 250 to assist in balancing their hormones and treat symptoms like weariness, a lack of libido, and muscle loss. Some athletes abuse it in bodybuilding to artificially boost their strength and muscular mass, which may have negative health implications.