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Vitamin B12 deficiency is most common in adults over 50, vegans and vegetarians, pregnant women, and those with chronic health conditions like Crohns disease, inflammatory bowel disease (IBS), or rheumatoid arthritis

This section describes regulatory status for reference

This new study examined 536 subjects, so it wasn't huge, but not small either

Figure 4: Number of MAOs offering D-SNPs by state (CY 2023) D-SNP availability is also expanding at the local level, through both new plans and service area expansions for existing plans

For general injection guidance including syringe selection, that resource covers the full landscape