The product is usually injected subcutaneously (under the skin) or intramuscularly (into the muscle)
I hope the NHS Constitution will help you to do this
MHRA Threat to clinics In communication with the MHRA, they also stated: However, we do have concerns about the level of clinical oversight present in IV vitamin therapy and injection services in general and the appropriacy of such services is currently under review. This review, if deciding on stopping treatment of B12 injections by clinics who do comply with the ridiculous rules of the MHRA, would not only negatively impact the companies and individuals who give B12 injections, but also to the people who rely on them to keep functioning both physically and mentally

Quality Systems Behind Every Methylcobalamin (B12) Injection Every Farbe Firma Methylcobalamin (B12) Injection batch is released only after a full stack of quality checks: stability-indicating HPLC assay of methylcobalamin against pharmacopoeial reference standards, control of related substances and degradation products by HPLC, pH and osmolarity, clarity and colour of the solution, visible and sub-visible particulate matter, bacterial endotoxin by LAL, sterility by membrane filtration, fill-volume verification and container-closure integrity for the amber-ampoule format
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