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Clinical laboratories generally define vitamin B12 deficiency as a serum level below 148 pmol/L (approximately 200 pg/mL)
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Here are some key factors our providers review with patients to help guide the decision: Your lab results Comprehensive testing of hormone levels reveals if declining growth hormone, testosterone or both are at play
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Fatigue, lightheadedness, and overall weakness are the most common symptoms of low B12
Your recommended dietary allowance (RDA) of iron depends on age and gender
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