Psychosomatic Medicine
Reduced fluid intake may lead to a dry, uncomfortable sensation on the tongue, altered taste perception, or a feeling of the tongue sticking to the roof of the mouth
Some even experience hallucinations and psychosis
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Malabsorption Issues : If you have conditions like pernicious anemia, Crohns disease, or have had weight loss surgery, vitamin B12 injections may be a more effective option due to the bodys difficulty absorbing B12 through the digestive tract
10.1016/S0891-5849(96)00338-3