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Safe B12 Supplementation in the UK Vitamin B12 supplementation is widely available in the UK and, when used appropriately, represents a safe intervention for preventing or treating deficiency

[124] Other causes of B 12 malabsorption include bariatric surgery, pancreatic insufficiency, obstructive jaundice, tropical sprue, celiac disease, inherited intrinsic factor deficiency, and radiation enteritis affecting the distal ileum

Serious reactions are very uncommon

Vitamin B12 Is needed to make red blood cells, helps the nervous system function normally, and helps to reduce tiredness

GHK-Cu is not in the page's active Category 2 table

doi: 10.1210/jcem.76.6.8501156