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Description
Topical bioavailability: Lower but meaningful

Immediate effects: Some patients report feeling an improvement in energy levels within 24 to 48 hours, though this varies

Each condition requires specific dosing protocols, typically starting with frequent loading doses before transitioning to maintenance therapy
Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called the intrinsic factor

[18] MedlinePlus
