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Insufficient dietary intake To prevent deficiency, oral cyanocobalamin supplementation once daily 20-50 mcg or 50-150 mcg is most commonly recommended

Absorption: Poor Absorption Due To GI Diseases-Picture Courtesy: Pet Talks For oral absorption, two things are required, healthy intestine and intrinsic factor

Carcinogenesis, Mutagenesis, Impairment of Fertility

Sivakumar T, Mechanic O, Fehmie DA, Paul B

In D-galactose-induced aging mice, oral administration of the product significantly increased NAD+ levels in liver and adipose tissue, activated mitochondrial energy metabolism pathways, improved insulin sensitivity, lowered blood glucose and lipid levels, reduced visceral fat accumulation, and increased energy expenditure, alleviating fatigue and abnormal body weight associated with aging

Signs include feeling very tired, weak, and having nerve problems