How much?
Do you use vet grade?
How about the whole oil based / Water based thing?
Would it be better to just use an insulin needle?
1. I usually add 0.25-.5ml to each shot.
2. I've used vet grade B12 without any problems.
3. What about it? You can mix water & oil based AAS.
4. Why would you want to use a slin pin? I'd hope you're talking about a seperate shot - passing oil through a slin pin could be a lot tough.