Attempts to reclassify injectable B12 to a Pharmacy (P) or General Sales List (GSL) medicine have consistently met resistance from the Medicines and Healthcare products Regulatory Agency and the government, based on two key legal criteria outlined in the Human Medicines Regulations 2012 : 1
Batch-level traceability from production to delivery
Results develop gradually and vary based on the specific peptides used, dosage, and individual response

Groups at increased risk of B12 deficiency include: Vegans and strict vegetarians , who avoid all animal products and are at significant risk without supplementation or fortified foods Older adults , in whom reduced stomach acid production impairs B12 absorption People with pernicious anaemia , an autoimmune condition that destroys intrinsic factor-producing cells Those who have undergone gastric surgery , including bariatric procedures, which can reduce intrinsic factor availability Individuals taking long-term metformin for type 2 diabetes, as this medication is associated with reduced B12 absorption the MHRA has issued specific safety advice on monitoring B12 levels in this group [6] [7] People with conditions affecting the small intestine , such as Crohn's disease or coeliac disease Symptoms of B12 deficiency can include fatigue, weakness, pins and needles, memory difficulties, and a sore or inflamed tongue (glossitis)
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A deficiency can lead to fatigue, weakness, and sluggishness