при диабетической нейропатии у пациентов бывает погранично-низкий кобаламин, коррекция до норм. цифр иногда помогает в лечении нейропатий
Low vitamin B12 levels were found in 7.3% (95% CI: 4.0–12%) of patients. In those with diabetic neuropathy, altered (low and borderline) vitamin B12 level was 64% (95% CI: 47–78%) compared to 17% (95% CI: 10–26%) in patients without diabetic neuropathy (coefficient: −110.8; CI 95%: −165.8, −59.7). Those taking a higher metformin dose had lower levels of vitamin B12 (coefficient: −0.061; CI 95%: −0.09, −0.024).//Vitamin B12 deficiency and diabetic neuropathy in patients taking metformin: a cross-sectional study
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