Children presenting neurological signs or symptoms, those unable to take oral medication, individuals with known malabsorption syndromes, infants under 6 months old, and patients using medications that may interfere with vitamin B12 absorption are typically treated with a parenteral protocol (1)
The liver can store the vitamin for a long time, so it may take a few years for deficiency and symptoms to develop
More serious but rare adverse events include pancreatitis (0.2% incidence), gallbladder disease requiring surgical intervention, and medullary thyroid carcinoma risk in genetically predisposed individuals (contraindicated in patients with personal or family history of MTC or MEN2 syndrome)
But as your B12 level rises, youll be able to get them more infrequently
Contaminated, underdosed, or completely fake products waste money while potentially causing harm
Timing should avoid food intake, as elevated blood sugar blunts GH release