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While anyone can benefit from optimal B12 levels, certain groups are at higher risk for deficiency: Adults over 50 (reduced stomach acid affects absorption) Vegetarians and vegans (B12 is primarily in animal products) People with digestive conditions (Crohn's, celiac, gastritis) Those who've had gastric bypass surgery People taking metformin or acid-reducing medications Anyone experiencing unexplained fatigue or brain fog Athletes and active individuals needing enhanced recovery Those with symptoms of B12 deficiency B12 Injections vs

It is not an inherited disease

The theory is that this keeps your body sensitive to the peptide and helps you lock in your progress, though this hasn't been proven

and (c) the average axonal diameter