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Neurological symptom recovery , such as relief from tingling or "brain fog," may take longer as nerves require time to heal

Check the powder color (should be blue to blue-purple), look for a third-party COA, verify HPLC testing, ensure the packaging is amber glass, and buy only from suppliers that disclose concentration and batch numbers

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PMID 4180811

This includes vegans and vegetarians, older adults, individuals with atrophic gastritis, pernicious anemia, gastrointestinal disorders, those who have had gastrointestinal surgery and people who take certain medications including, but not limited to, estrogen (HRT), and birth control pills

Some protocols call for an initial loading phase (e.g