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Although vitamin B12 deficiencies are rare in the U.S., certain medications and health conditions such as pernicious anemia can affect the absorption of vitamin B12 and contribute to a deficiency

It is also used to treat patients with certain types of breast cancer (estrogen receptor-positive, human epidermal growth factor receptor 2-negative) which have spread to other organs

These are easier to access but may be less predictable than injections

"Brain-gut Axis and Pentadecapeptide BPC 157: Theoretical and Practical Implications." Current Neuropharmacology

Hockenbery, D.M., Oltvai, Z.N., Yin, X., Milliman, C.L