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However, the clinical significance of this is unclear (144)

Cyanocobalamin is the most used and given in doses from 100 to 1,000 mcg

Carmel, Indiana is a northern Indianapolis suburb at latitude 39.978

"Food Labeling: Revision of the Nutrition and Supplement Facts Labels" (PDF)

ORAL: Adults: 500 mcg 3 times daily
Over time, high blood glucose damages the small blood vessels that supply nerves, so nutrients and oxygen cannot reach the nerves