I know B12 to be absorbed.. it must to be protected from the stomach acid (HCl), so it needs to be coated with the R-Protein or Haptocorrin which is excreted from the saliva glands..... Everything is fine with sublingual, because it stimulates saliva and it can be coated.. But how does B12 is being protected with R-Protein if you swallow powder capsule or put some B12 powder inside a juice and drink it up? Or B12 capsules.. they go straight into the stomach without stimulating the saliva glands, therefore they're not coated with R-Protein protection and they get destroyed?? From what I know also.. R-Protein is not being excreted from parietal cells. it doesn't say it in wikipedia or any other place.