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Systemic side effects are less common but can include headaches, dizziness, or nausea shortly after the injection

Sociodemographic characteristics Diagnosis (vitamin B12 deficiency or pernicious anaemia), age, sex, education level, employment status, country of residence (England, Wales, Scotland, Northern Ireland, Republic of Ireland), region of residence (nine English regions, according to the Office for National Statistics, Wales, Scotland, and Northern Ireland) were assessed using the questions in Supplementary Table S1

Small imbalances or weaknesses anywhere in this system create compensatory patterns that perpetuate injury

Human gut applications lack clinical trial support