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5.3 Hypervitaminosis A Hypervitaminosis A, manifested by nausea, vomiting, headache, dizziness, and blurred vision, has been reported in patients with renal failure receiving 1.5 mg per day retinol and in patients with liver disease
2022 Jan 1;117[1]:27-56
Most serums dilute their active compounds across 20 or 30 other components
For individuals whose primary challenge is overeating, this represents a significant limitation
This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation