Wow 500mg/ml is EPIC strength!!! I've never scene anything above 400mg/ml.
At this strength, its almost inevitable that you'll have some significant side effects, such as extreme PIP and even flu-like symptoms if you inject it on its own. I should know, I just went through these same sides with Test E that is 400mg/ml.
Just curious as to how the test400 pain ended up lasting? I just started a test450mg with a delt shot the other night and it feels like I was stabbed with a big knife. Not to mention three days of flu like symptoms. I’ve had some test 400 that hurt a few years back, so I know what you mean.ive had my share overv30 years in the gym, and not all good.lol