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Description
A stronger immune system B12 supports the production and function of white blood cells

Experimental work described by Patt et al

If you've had a BAD experience with B12 shots, it's most likely that you do not tolerate or convert cyanocobalamin well (see if you can verify what form of B12 was in the shot that made you react poorly, and then stay away from that specific form if you can)
Intramuscular administration allows B12 to bypass hepatic metabolism and enter systemic circulation directly, which is why this route differs from oral supplementation
