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Li S, Zhang L, Wei N, Tai Z, Yu C, Xu Z
Symptoms include: Fatigue and Lethargy Depression Irritability Headaches Difficulty with balance Decreased Cognitive Function Constipation Sore or Swollen Tongue Palpitations Mouth Ulcers Pins and Needles Changes to vision People With Gastrointestinal Issues If youre suffering from any gastrointestinal disorders, you may be at a higher risk of Vitamin B12 deficiency
Neuroscience and Behavioral Physiology, 22 (4), 275-279
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