where should you inject a b12 shot How to Give Injection: Step-By-Step Instructions Instruction Guide for Intramuscular (IM)
Description
Lipotropic injections can help you release fat deposits in some of these areas, including your: The combination of ingredients in the lipo-B12 shots directly aids in the breakdown of fat in these trouble spots
Degradation of aggregated LDL occurs in complex extracellular sub-compartments of the lysosomal synapse

This suggests to me that the absorption under the tongue is not as good as most people think

Make sure there is no air trapped inside and no blood when you pull on the syringe slightly

It combines vitamin B12 with other B vitamins
