is b12 injection safe in pregnancy Vitamin and Pregnancy: Benefits, Intake & Food Sources Vitamin B12 Injections: Benefits for
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Potency, sterility, and stability may vary

As for Rybelsus, since its an oral medication, it doesnt need refrigeration and can be stored at room temperature

A trained clinician does this routinely

"Determinants of Plasma Methylmalonic Acid in a Large Population: Implications for Assessment of Vitamin B12 Status." Clinical Chemistry, vol
This is vital for people with absorption issues or at risk of deficiency

Historically, nerve blocks date back to the early 20th century with the advent of local anesthesia