Systemic side effects may include nausea, gastrointestinal upset, flushing, and, in rare cases, allergic reactions such as rash, hives, or anaphylaxis
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The 2024 NICE NG239 guideline on vitamin B12 deficiency in over-16s lists the main groups who need injections: Autoimmune gastritis (pernicious anaemia)
Pernicious Anemia: Why B12 Injections
How CoLaz approaches B12 injections At CoLaz, B12 injections are given by trained clinicians after a written consultation that reviews your history, symptoms, medications and (where the picture warrants it) an NHS blood test through your GP
Carcinogenesis, Mutagenesis, Impairment of Fertility: Long term studies in animals to evaluate carcinogenic potential have not been done