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Make sure there is no air trapped inside and no blood when you pull on the syringe slightly
Dosage / Administration of B12 Injections Subcutaneous shots can be administered instead of intramuscular - means injecting with a very short needle into the fat layers around your abdomen or thighs - easier for self-administration and the B12 is released slowly
The responsible first step in either case is testing, not guessing
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