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adults aged 19 and older have a vitamin B12 deficiency, defined as serum levels lower than 200 pg/mL

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Avoid repeated freeze-thaw cycles unless freezing in single-use aliquots

Effects of methyl-B12 on the in vitro immune functions of human T lymphocytes

A deficiency can affect the babys development

Precautions General Precautions: Vitamin B12 deficiency that is allowed to progress for longer than 3 months may produce permanent degenerative lesions of the spinal cord