vitamin b12 injections after bariatric surgery The Effects of on B Status and Mental Health Best Vitamins After Bariatric Surgery
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7, July 2004, pp

Anecdotally, some patients and practitioners claim positive results, but this is not scientifically proven
"Vitamin B12 deficiency is associated with adverse lipid profile in Europeans and Indians with type 2 diabetes"

Decreased stomach acid production also provides an environment conducive to the overgrowth of anaerobic bacteria in the stomach, which further interferes with vitamin B 12 absorption (3)
