does b12 injection cause constipation in deficiency is primarily neurogenic, due to autonomic and enteric neuropathy causing slow gut motility • Constipation may precede anemia • Often improves after B12 replacement • Think of B12 Why Do You Need B12
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It is also worth noting that some research has linked excessive levels of B12 to liver or kidney disease or certain cancers

Verdich C, Flint A, Gutzwiller JP, Naslund E, Beglinger C, Hellstrom PM, et al

Vitamin C Levels in Asthma Not only does a low vitamin C intake occur in asthma, but first of all, a low plasma level of the vitamin is observed both in children [211,275] and adults [85,96,98], and is more pronounced in the severe form of the disease [275]
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A., Sciubba, D