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An intradermal test dose is recommended before cyanocobalamin injection is administered to patients suspected of being sensitive to this drug

[21] Neurological symptoms: Sensory or motor deficiencies (absent reflexes, diminished vibration or soft touch sensation), subacute combined degeneration of spinal cord, or seizures

Are B12 injections safe if I don't have a deficiency

This B12-intrinsic factor complex is essential for absorption, as it protects the vitamin during its journey through the digestive tract and facilitates its uptake in the terminal ileum (the final section of the small intestine)

[3] Sublingual and nasal preparations are available but are not routinely recommended within UK clinical guidance and may not be licensed as medicines

If any step in that chain is off, absorption drops