What nutritional deficiency causes tactile hallucinations?
                                
                                
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                                    5 min read                                
                            
                                According to a 2024 systematic review, vitamin B12 deficiency is increasingly recognized for its association with neuropsychiatric symptoms, including hallucinations. Tactile hallucinations, specifically the sensation of insects crawling on or under the skin (formication), can signal this or other serious nutritional deficiencies.