Systemic symptoms such as fever, chills, or malaise following injection warrant immediate medical evaluation
Recent B12 administration: Therapeutic injections for deficiency can temporarily raise levels significantly
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This is particularly important if you are part of any of the groups considered to be at high risk of B12 deficiency, including alcoholics, smokers, those on diabetes drugs, adults over 65, those with gastrointestinal disorders and those who have had surgery relating to the digestive tract
Others may need GP-led investigation, blood tests or long-term treatment depending on the cause of deficiency
B12 supplements may also improve mood and reduce symptoms of depression, as well as improve skin and hair health by promoting cell growth and repair