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When B12 is deficient, a buildup of methylmalonic acid occurs, which is toxic to the nervous system and contributes to neuropathy

Some practitioners may recommend B12 shots up to two times per week to enhance energy levels and fat metabolism [2]

Oral supplements face challenges in the digestive system, where absorption can be low, mainly in those with certain gut issues

It is available as an oral dietary supplement in tablet form, or doctors can also prescribe it as a shot

Commonly reported issues include mild gastrointestinal discomfort, particularly when starting the compound, and temporary headaches during the adjustment period