IV hydration may be discussed when dehydration or a broader supportive-care need is part of the visit
B 12 is normally involved in the metabolism of every cell of the human body, especially DNA synthesis and regulation, but also fatty acid and amino acid metabolism
Gesundheitswesen (in German)
Also, if there is no clinical data for a substance, and an awareness that the substance has the propensity for harm, that could make it an appropriate placement on the Category 2 list. Are They Safe
Helps Treat Vitamin B12 Deficiency 2
According to a study published in PubMed Central (NIH), IV administration of vitamin B12 provides a faster increase in B12 levels compared to oral supplementation, making it a potentially better option for patients with severe deficiency