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Common signs include: Fatigue and weakness Numbness or tingling in the hands and feet Difficulty walking or balance problems Mood changes, such as depression or anxiety Cognitive difficulties, including memory loss or confusion If not treated, a B12 deficiency can cause serious problems
Biological passport evolution The Athlete Biological Passport tracks biomarkers over time rather than testing for specific substances
Other medications, such as the antibiotic chloramphenicol or certain chemotherapy drugs, can also affect how your body processes vitamin B12
For a detailed comparison, see our article Klow vs Glow
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