Hello guys! I love this site. I’ve found lots of very useful information, great articles, and good insights. I am new relatively new here. This is my first time posting or asking a question. I apologize if I’m asking a question that has already been addressed. 
I looked and didn’t find anything where I looked?!
I am injecting Test-C 250mg twice a week and a test/tren stack of 400mg test/400mg tren three times a week. I’ve done this cycle for 8 weeks several times in the past with no issues. This particular cycle I’m having issues with injection site pain. Not at first, but after injecting a few different times. The worst one is my left glute. I pretty well can’t inject there anymore currently. It burns terribly as soon as I start to inject. I’ve always preferred injecting in the glutes. It’s where I’ve had the least amount of PIP. I usually vary my injections between a 29gauge 1/2” needle and a 25gauge 1 1/2” needle. My experience has been that if I vary the depth of injection I have less occurrences of site pip. I’m wondering if any of you have ever experienced where you literally had to give up on an injection site? I’m hoping it won’t be anything permanent? Did I damage something irreparably? Thanks in advance. Feel free to let me know if I need to post this in a different place? Or go about this differently?
Are you using the same brand of gear this time as the other times? Could be the carrier oil or solvents that are being used to make it
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Yes, same gear. Nothing has changed there. I usually lean heavily on my glutes but will vary it with my quads some just to give my glutes a little break. Currently I’m using my delts and thought of even trying my pecs to give my glutes a bigger break? Just not sure. I’ve dealt with PIP. just never had the burning pain as soon as I even start pushing anything in.
Clarify what these products are. What are the concentrations of each?
You are injecting testC at 250mg/ml 2x per week or 125mg, 2x per week.
Same with the test/tren combo. 400mg of each 3x per week or 400mg each split between 3 injections?
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Test C @ 250mg/ml. 1 ml twice a week for a total of 2ml a week.
Test/tren/boldenone stack
Test 100mg/ml
Tren 100mg/ml
Boldenone undecylenate 50mg/ml
I pin this stack @ 4ml 3 times a week for a total of 12ml a week.
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I would look at the vials from the old and the new and see if they are the same batch if you can. If they are not I would suspect the manufacturer changed the carrie oil, solvents or both.
4ml 3x per week is too much oil. I’ve run some pretty big stacks and never gone over 8ml/week. There are def better ways this could be put together.
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I’m definitely open to suggestions. I’m relatively new to using any gear. Ive done a couple of cycles that I described to you. Other than that I am normally on one ml of the Test C a week. This is a stack I was recommended by a couple of bodybuilding friends. I’ve definitely seen results from it, but I’m certainly to learning more. That’s why I found this site. I was researching more on my own. And stumbled across it.