I'm taking Test E and I'm getting test flu every single time I inject (2 ties a week). Also, the PIP is pretty bad. It only seems to be this vial though because I've used another vial delivered at the same time and didn't have an issue at all. It's making me miserable.
If you are experiencing flu symptoms then the likely cause is the Benzyl Alcohol content used usually in higher concentrations to get more mg/ml into the preparation without precipitation. One way to circumvent this is to dilute with sterile grapeseed oil. Had this problem with some sus. In my case the short esters were precipitating out faster than normal causing a local inflammation response. To over come this I had to add benzyl benzoate at 20% by volume and dilute approximately by half with grapeseed oil. Filter your gear with a micro filter and dilute.