size of b12 injection Is It Okay To Use A With Insulin Syringes? B12 Injection Dosage and Frequency:
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[2] Other conditions giving rise to malabsorption include surgical removal of the stomach, chronic inflammation of the pancreas, intestinal parasites, certain medications such as long-term use of proton pump inhibitors, H2-receptor blockers, and metformin, and some genetic disorders

On a biological level, the vitamins and nutrients found in lipotropic injections are absorbed quickly

Am J Psychiatry 2000;157:715-21
A small randomised open label pilot study authored by Vasudevan et al

PMID 16497429

Researchers are exploring oral and nasal delivery systems, but none are commercially available
