omeprazole and b12 injections (NAHAZOLE) 40 mg B12 Deficiency & Stomach Tablets:

Contraindications: Not for use in individuals with cancer, during pregnancy/breastfeeding, or those with known hypersensitivity to peptide components

[1] For licensed B12 medicines, detailed information about side effects can be found in the product's Summary of Product Characteristics (SmPC)

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in such settings, slowed metabolism or altered protein binding can provoke toxic plasma levels even with standard dosing

In the UK, any medicine must hold a valid Marketing Authorisation granted by the MHRA before it can be legally sold or supplied for medicinal purposes