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It is worth noting that fatigue may appear before anaemia develops in some cases, as the neurological and metabolic effects of B12 deficiency can manifest independently of haematological changes

B12 injections for simple vitality support

However, unnecessary supplementation offers no added benefit if your B12 levels are already normal

. Doctors may not be prescribing oral vitamin B12 formulations because they may be unaware of this option or have concerns regarding its effectiveness Objectives: To assess the effects of oral vitamin B 12 versus intramuscular vitamin B 12 for vitamin B 12 deficiency. Selection criteria: Randomized controlled trials (RCTs) comparing the effect of oral versus IM vitamin B 12 for vitamin B 12 deficiency