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Kidney Disease: Patients with kidney disease should use B12 injections with caution, as the kidneys are involved in metabolizing B12
If your levels were already healthy, a single shot tops you off, and the noticeable effects fade sooner
Adjusting the dosage under medical supervision is recommended
Malabsorption Disorders: Conditions such as pernicious anemia, Crohns disease, celiac disease, or a history of gastric bypass surgery can hinder B12 absorption
Here's the general pattern folks tend to experience
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