Boost Immunity Lack of energy and metabolism might reduce immunity levels in the body, and B12 injections support the body with improved immune function
My local hospital where I go for a regular blood test has such a system

Rare: may affect up to 1 in 1,000 people Acniform and bullous eruptions (acne-like and blistery skin eruptions) Not known: frequency cannot be estimated from the available data Headache, dizziness Nausea (feeling sick), vomiting, diarrhoea Malaise (feeling unwell) Rash, itching Injection site reactions including injection site pain, injection site erythema, injection site pruritus, injection site induration, and injection site swelling (Reactions at the site of the injection) Exanthema (a widespread skin rash) Chromaturia (unusual coloured urine) Fever Hot flushes (a feeling of intense heat with sweating and rapid heartbeat) Chills (feeling of coldness accompanied by shivering) Paraesthesia (feeling of pins and needles) Tremor (tremble or shakes) Hypokalaemia (decreased potassium levels in the blood) Reactive thrombocytosis (body produces too many platelets) Reporting of side effects If you get any side effects, talk to your doctor, pharmacist or nurse

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Compare with metabolic compounds Researchers often explore 5-Amino-1MQ alongside other metabolic compounds depending on pathway focus
Pinto JL, Abelln JM, Snchez FI: Incorporacin de las preferencias de los pacientes en la toma de decisiones clnicas