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National Institutes of Health (NIH) recommends the following daily amounts: Infants (06 months) : 0.4 mcg Children (18 years) : 0.91.2 mcg Adolescents (913 years) : 1.8 mcg Teens (1418 years) : 2.4 mcg Adults : 2.4 mcg Pregnant : 2.6 mcg Lactating : 2.8 mcg 4.2 Oral Supplementation For individuals at risk of deficiencyor those aiming for optimal neurological supporthigher oral doses are often used: Maintenance : 1,000 mcg daily of methylcobalamin Correction : 2,0005,000 mcg daily until blood markers normalize Form : Methylcobalamin preferred for direct nervous system uptake, though cyanocobalamin is also effective

This includes checking lab results and symptoms

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The FDA cited the lack of human studies on the peptide and concerns about safety as its rationale