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The cornea can become dry and scratched, which can lead to permanent vision problems

Vitamin B12 is important for proper neurological and cognitive functioning and is also essential for maintaining energy levels and a healthy metabolism

Risk increases significantly after 2+ years of use Post-bariatric surgery patients gastric bypass removes or bypasses the sites of intrinsic factor production and B12 absorption People with autoimmune conditions pernicious anemia (anti-intrinsic factor antibodies) and autoimmune gastritis directly block absorption People with GI conditions Crohns disease (especially ileal involvement), celiac disease, SIBO, and chronic H

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A decreased risk of becoming infected with the common cold has also been linked to moderate alcohol intake