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Vitamin B12 increases energy, supports nerve function, and improves mood, while Vitamin C strengthens the immune system, promotes collagen production, and enhances skin health

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They are often combined for enhanced results

doi: 10.1016/j.phrs.2021.105465 61 ChuLValenciaIJGarvertDWMontoyaJG

Absorption of B12 in food requires a substance from our stomachs called intrinsic factor, the production of which decreases with age People with chronic fatigue or anaemia require regular injections of vitamin B12 because the oral form is unreliable