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A study conducted in 2016 thus came to the following conclusion: If we had restricted the treatment of symptomatic patients to patients with both low serum levels and elevated metabolite levels, 63% of patients who responded well to the therapy would not have received treatment [] Only 16% of patients with good clinical improvement from vitamin B12 therapy had low serum levels and 54% of patients with good clinical improvement from vitamin B12 therapy had serum levels higher than 300 pg/mL. Some experts thus advise high-dose B12 treatment to treat all known nervous symptoms associated with B12 deficiency

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Upon phencyclidine administration, Iltis and co-workers observed an immediate rise in cortical glucose levels that normalised within 30 min, while lactate content was substantially reduced and took nearly 1 h to reach baseline levels [64]

Similarly, Ghneim et al