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I take quite large (several grams) doses of vitamin C every day. At times, for example when I am ill, my blood glucose levels are not that well controlled. However my long term Hba1c test is always quite good, usually around 7. Could this be due to the vitamin C or is it something else?

From: DTeam Staff

I can think of no reason why Vitamin C should affect your blood glucose control.

KJR
Additional comments from Dr. Bill Quick:

Of course, it’s expected that blood sugar levels would be less well-controlled in anybody with diabetes during any acute illness.

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Meal Planning, Food and Diet