Where to Inject?

I was wondering where would I inject the test I wanted to buy?

I read somewhere that the glutes are the best place to inject and that traps and calves are not recommended becasue it causes the user pain.

If I inject it in my glute(s) will only my lower body be affected or will my whole body be affected for gains?

I know this is a beginner question but its something that I want to know before I start a cylce.
 
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