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Most people get enough vitamin B12 in their diet, but a deficiency may occur in certain health conditions (e.g., poor nutrition, stomach/intestinal problems, infection, cancer)

Additionally, Neurobion can be excreted into breast milk, and while the risks of overdose in newborns are not yet clear, high doses of Vitamin B6 (over 600mg per day) may cause a reduction in or cessation of breast milk production

The NHS states a sore and red tongue could be a sign of a vitamin B12 deficiency

10.1016/j.plaphy.2021.04.0261 Plant Physiol Biochem

In addition, these diseases are complicated by some comorbidity that patients present (overweight, obesity, diabetes mellitus, etc.)

doi: 10.3389/fphys.2023.1344271