Vitamins D, B12 and B1 play important roles in metabolism, nerve function and overall health. Their levels deserve attention among people with diabetes or prediabetes, although supplements cannot directly control blood sugar or replace prescribed treatment. Dr Rituja Ugalmugle, Consultant in Internal Medicine at Wockhardt Hospitals, Mumbai Central, explains that these vitamins support metabolic health in different ways. Vitamin D may influence insulin sensitivity and the functioning of pancreatic beta cells, which produce insulin. Low levels have been associated with insulin resistance, but deficiency does not automatically mean someone will develop diabetes. Symptoms can include bone pain, muscle weakness and fatigue. Vitamin B12 is essential for nerve function and red blood cell formation. Deficiency can cause weakness, anaemia, tiredness and tingling or numbness in the hands and feet. People taking metformin, particularly over extended periods, may be at increased risk of low B12 levels. Doctors may recommend blood testing when appropriate. Vitamin B1, also called thiamine, helps the body process carbohydrates and supports nerve health. Deficiency may cause fatigue, reduced appetite and neurological symptoms. However, it is not a treatment for elevated blood glucose. Experts recommend assessing nutritional deficiencies through appropriate medical evaluation rather than taking supplements routinely. Excessive vitamin D supplementation, for example, can cause dangerously high calcium levels. People with diabetes, especially those taking metformin, should discuss vitamin testing and supplementation with their healthcare provider. Maintaining adequate nutrient levels can support overall health, but diabetes management continues to depend on appropriate medication, nutrition, physical activity and medical supervision.

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