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For dietary deficiency in the absence of malabsorption, oral cyanocobalamin supplementation (50150 micrograms daily) may suffice, though compliance and absorption must be monitored

Zhao, L., Li, Z., Vong, J.S.L., Chen, X., Lai, H.-M., Yan, L.Y.C., Huang, J., Sy, S.K.H., Tian, X., Huang, Y., Chan, H.Y.E., So, H.-C., Ng, W.-L., Tang, Y., Lin, W.-J., Mok, V.C.T., Ko, H., 2020

10.1002/jcsm.13659 2 AlbertiS.BhseK.ArndtV.SchmitzA.HhfeldJ

Zibold J, von Livonius B, Kolarova H, Rudolph G, Priglinger CS, Klopstock T, Catarino CB

Children's requirements are lower and increase with age: infants aged 0-6 months have a safe intake of about 0.3 g daily, those aged 712 months need 0.4 g daily, children aged 13 years require 0.5 g, those aged 46 years need 0.8 g, and children aged 710 years should receive 1.0 g daily