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The histidine residue serves as the primary copper-binding site, while the lysine residue contributes to cellular uptake through electrostatic interactions with negatively charged cell membranes

[56] [57] Low levels of serum vitamin B 12 may be caused by other factors than B 12 deficiency, such as folate deficiency, pregnancy, oral contraceptive use, haptocorrin deficiency, and myeloma

Who is more likely to have low B12 Vegetarians and vegans, since B12 comes mainly from animal foods Adults over 50, because absorption naturally declines with age People with gut conditions such as celiac, Crohn, or past GI surgery Long-term users of metformin or acid-reducing medications People who have had weight-loss (bariatric) surgery Those with heavy or frequent alcohol use If you see yourself in that list, a simple blood test is the logical next step

The result is a therapy that has found real traction among wellness seekers, athletes, and people dealing with chronic fatigue, skin health concerns, or liver stress

Users should assess progress through objective measurements (body composition analysis, circumference measurements, progress photos) rather than scale weight alone, as fat loss may be accompanied by muscle preservation or gain