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Without adequate levels of vitamin B-12 in your diet, your immune system can become weakened and unable to fight off infections or illness

A rise of at least 60% in 48 hours is generally considered normal

[43] [41] During pregnancy the placenta concentrates B 12 , so that newborn infants have a higher serum concentration than their mothers

What the Clinical Evidence Shows What the Clinical Evidence Shows B12 deficiency and metabolic phenotype A 2023 study of children, adolescents, and young adults found low serum B12 was associated with worse metabolic phenotype across the weight spectrum

Habibullah MM, et al

Some people may also experience loss of taste and smell