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You may feel a slight sting from the injection, but this should subside quickly
More research in this area is needed to further understand the effects of taking B12 if you have kidney disease
Risk factors that should prompt consideration of B12 deficiency include advancing age (reduced stomach acid production), strict vegan or vegetarian diets, pernicious anaemia, gastrointestinal surgery (particularly gastric bypass or ileal resection), long-term use of certain medications (metformin, proton pump inhibitors, H2-receptor antagonists), nitrous oxide exposure (including recreational use), and conditions affecting the gut such as Crohn's disease or coeliac disease
The rule is simple: start at beginner for two weeks, then move to standard if you feel fine
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