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Sustanon 250 Contains Four Testosterone Esters Sustanon 250 is a blend of four testosterone esters testosterone propionate, testosterone phenylpropionate, testosterone isocaproate and testosterone decanoate. The first, testosterone propionate, is short-acting and gives Sustanon a quick onset of action in a steroid cycle. The other esters are medium to long-acting. It is an ideal compound for putting on size and increasing muscle strength.Benefits like increased muscle mass, increased strength, increased libido and improved recovery after each training session. Sustanon Side Effects Side-effects from using Sustanon 250 are consistent with side-effects of any testosterone. They include water retention and gynecomastia (bitch tits) from testosterone’s conversion to estrogen by the aromatase enzyme. Users on Sustanon also risk side-effects like hair loss and swelling of the prostate, mainly from testosterone’s conversion to dihydrotestosterone (DHT) by the 5-reductase enzyme. Both of these side-effects can be minimized with the use of selective estrogen receptor modulators (SERMs) like nolvadex (tamoxifen) or aromatase inhibitors (AIs) like aromasin. Sustanon 250 Dosage Most bodybuilders inject anywhere from 250mg to 1,500mg per week, with 500mg to 750mg being the most common dose. Some users feel they harness the full power of the propionate ester when they inject sustanon 250 every third day. This is not necessary, as weekly injections work fine.