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[2] Hydroxocobalamin is administered via intramuscular or intravenous injection to treat and prevent vitamin B deficiency, particularly in conditions like pernicious anemia where oral B absorption is impaired

[16] After this initial phase, the frequency is reduced

American Journal of Clinical Nutrition, 115(4), 787-789

Metabolism and weight management Optimized B12 supports metabolic function, which may help your body process nutrients and energy more efficiently, especially when combined with a healthy lifestyle

See these diagrams: Source: Clinical Procedures for Safer Patient Care by Doyle & McCutcheon

Many grains, like bread and cereals, have folic acid added to them