Very common (more than 1 in 10): mild pain, redness, or swelling at injection site usually fades in a day
Oral supplements are generally more convenient than injections, as they do not require a visit to a healthcare facility or a home visit from a healthcare professional for administration
Conversely, if a patient presents with pernicious anemia or severe neurological signssuch as intense tingling in the hands, memory loss, or muscle weaknessthe dosage remains the same (usually 1,000 mcg), but the frequency increases significantly
doi:10.1111/dom.13343 Malekshahi Moghadam A, Saedisomeolia A, Djalali M, Djazayery A, Pooya S, Sojoudi F