Sustanon 250 (Testosterone blend: 30mg Testosterone Propionate, 60mg Testosterone Phenylpropionate, 60mg Testosterone Isocaproate, 100mg Testosterone Decanoate) Sustanon 250 is an oil based injectable testosterone blend. Its popularity lies in the fact that it presents the user with a blend of four different testosterone esters: Propionate, Phenylpropionate, Isocaproate and Decanoate. This allows for a fast yet sustained release of testosterone which stays active in the system for around three weeks. The Propionate and Phenylpropionate esters are the first to be released in the system and take effect within the first four days, whilst the Isocaproate and Decanoate remain active for two to three weeks respectively. This supplies the user with the obvious advantage of more sustained testosterone levels throughout its active life – unlike the shorter activity of other testosterone products. However, despite this fact, some athletes choose to inject Sustenon at a dose of 250mg every seven to ten days. As with all drugs, higher doses have been reported with some using 750-1000mg/week but this is not advisable since side effects are likely to increase hand in hand with dosage. Talking of side effects, you can expect all the usual testosterone related ‘suspects’ to manifest e.g. oily skin, body/facial hair growth, premature balding and elevated estrogen levels which can also produce noticeable water retention. However, due to its slow and sustained release, Sustanon 250 does seem to aromatize (convert to estrogen) at a lower rate than other testosterones. There are always going to be some individuals who are more susceptible to estrogen conversion than others and therefore the addition of an anti-estrogen such as Nolvadex may be necessary. Sustanon will also suppress natural testosterone production so it may also be necessary to add HCG (Human Chorionic Gonadotropin) and/or Clomid (Clomiphene Citrate) at the conclusion of your cycle in order to avoid a hormonal crash. Keep in mind the fact that Sustanon will remain active in the body for up to a month after your last injection, therefore HCG or Clomid use should be delayed by two or three weeks until your blood androgen levels begin to display a significant decline.