why b12 injections Sublingual B12 vs. B12 Injections:

However, there are many unusual symptoms associated with vitamin B12 deficiency, and most will disappear after taking vitamin B12 long enough to get the stores up to a normal amount and have maintained stable levels of vitamin B12

doi: 10.1038/s41467-022-34069-z 237 NairAKTraurigMSutherlandJRMullerYLGrellingerEDSaporitoLet al

If symptoms persist despite regular oral supplementation, absorption may be limited

Journal of Physiology and Pharmacology, 60 Suppl 7, 115122

The benzyl alcohol content inhibits bacterial growth, making it suitable for applications that require repeated access to the vial

Muscle crush After crush injury ( Fig