Can you change over your test blend to strait enanthate midcycle say week 5 of 12???

And if so How would you do it as far as timing?
I am currently doing sus 250 at 500 a week EOD on injections.... I plan to do same dosage but obviously nix the EOD thing.. when should I start as far as distance from the last Sustanon shot

this is all I could muster up from safe sources where I am at... if the next question was gonna be why the mix in gear