Headache support Hydration + nutrient support when appropriate
This makes injections highly effective for pernicious anaemia and other malabsorption syndromes, including post-gastrectomy states, Crohn's disease affecting the terminal ileum, and certain medications that interfere with B12 uptake
The standard protocol begins at 0.25 mg per week for the first four weeks, then escalates to 0.5 mg, then 1.0 mg, with some protocols going up to 2.4 mg per week for weight management
But for the right person, they offer real support sharper focus, steadier energy, a metabolic nudge that makes other efforts pay off faster
StatPearls notes that high-dose oral B has been shown effective for maintenance, but recommendations are to always use the parenteral route in severe neurological manifestations