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However, you should: Call 999 or go to A&E immediately if you experience signs of a severe allergic reaction (difficulty breathing, severe throat/facial swelling, or collapse) Contact your GP if you experience a rash, itching, persistent pain at the injection site, or worsening neurological symptoms despite treatment If you suspect any side effects from your B12 injections, you can report them through the MHRA Yellow Card scheme (yellowcard.mhra.gov.uk)

Patients choosing this route should discuss the risk-benefit calculation with their prescriber

Abdominal injections tend to provide the most consistent and slightly faster absorption

Adding peptide detection would make testing dramatically slower and significantly more expensive for most workplace use cases