Avoid combining with NSAIDs, which may counteract its healing effects
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

Read Guide The MHRA, Research Peptides & UK Compliance: What Changed in 2026 A plain-English guide to the UK regulatory picture for research peptides in 2026 what the MHRA's action targeted, what 'research use only' actually means, and what compliant, transparent sourcing looks like
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1 mg is the same as 1000 mcg
However, quality varies between pharmacies, and not all compounders follow the same standards