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doi: 10.1016/0005-2760(89)90334-2

That means weekly shots are often needed in the beginning to keep energy and mood consistently up

Cyanocobalamin Injection, USP is also suitable for the vitamin B12 absorption test (SCHILLING TEST)

However, interpretation remains cautious, as reproductive endpoints (ongoing pregnancy, live birth) are inconsistently reported and dosing (commonly 24 g/day), formulations (MI alone vs 40:1 MI: DCI), co-therapies, and trial quality vary widely, prompting calls for larger, standardized, phenotype-stratified studies
