b12 sublingual vs injection When would supplements (as opposed to B12 tablets or injections) be indicated in a client with B12 deficiency? , The choice to use a sublingual B12 versus a tablet or is Comparison of sublingual vs. intramuscular
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doi: 10.1016/j.plefa.2005.04.011

In contrast, we occasionally hear from others who experience pain with B12 shots

Methylcobalamin is felt to be superior to cyanocobalamin because it does not require methylation for activation in the body

These observations are consistent with incretin-related pathway activation patterns commonly seen in tri-agonist research
