In most cases, vitamin B12 deficiency symptoms may include extreme tiredness, poor concentration, memory loss, dizziness, and disorientation
Patients frequently report an energy change in the first day or two, which is most plausibly B12 in deficient patients, and expectation in everyone else
(NCD-RisC)
For patients seeking weight loss who request B12 injections, GPs should: Assess for genuine deficiency through appropriate blood tests rather than empirical treatment Provide education about the lack of evidence supporting B12 for weight loss in non-deficient individuals Explore underlying concerns about weight and energy levels, addressing these through appropriate channels Signpost to evidence-based resources such as NHS weight management services according to local pathways Patients should contact their GP if they experience unexplained fatigue, neurological symptoms (numbness, tingling, balance problems), or signs of anaemia (pallor, breathlessness, palpitations), as these may indicate B12 deficiency requiring investigation
Check labels and discuss alternatives with your doctor
Your provider will review your overall plan to ensure compatibility and safety