vitamin b12 injection deltoid Site What is the optimal site

it is rooted in cellular energy failure

Once the needle is all the way in, press the plunger on the syringe all the way down slowly

The honest position is this: there is no head-to-head human bioavailability trial telling you which route is superior for this specific molecule, so the best route is not a settled question

Healthy stomach acid is also beneficial for: Breaking down the protein Releasing B12 from food Absorbing nutrients like iron, zinc, and magnesium Protecting against harmful bacteria Signalling the rest of the digestive tract to work appropriately When stomach acid becomes quite low, food might sit heavily in the stomach