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When you injured your shoulder, how did you administer? At the point of the injury? Or does it even matter?

Another vote for pharmacy. Also, you might want to find a local holistic practitioner, and ask them where they get the needles for their B12 shots. They might be able to direct you to a place close...

I'm curious about this as well. I understand that it is supposed to help increase collagen. Is this true? And if so, are there any side effects?

I read that doing this can prevent users from entering REM sleep. That was enough for me to say forget it.

No. No. No, no, no.

Needles are meant to be used one time, and that's it. You can really jack up your skin, if you use it multiple times. Not to mention, that the needle could actually break off...