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The only thing that changed is the concentration

G.: The intestinal synthesis of vitamins in the ruminant

PubMed 11713214 Stier H
Key is himself a vegan and takes vitamin B12 tablets regularly

As a result, red blood cells grow too big and dont work well

The micro-channels created by the tiny needles improve penetration, so you increase bioavailability without the need for injection, which is where things get considerably murkier
