i got test flu and it sucks. i ran almost a 101 fever for 4 days with 450 mg of test in a shot. i also got it once with inject winny, but it wasn't as bad and went away in a day. anyways, i believe it was the product's fault with the test, but the winny was prolly my fault, because i don't think i injected properly. i make sure to always inject properly now. I rarely get sick ever, and can't remember the last time i ran a fever that wasn't aas related, so i know it was from the injections themselves. i don't think it did anything to my immune system.