Can taking vitamin C cause a blood sugar spike?
If you have diabetes and test your blood with a glucose meter and glucose testing strips, then taking an excess of vitamin C may actually cause a false “low” blood sugar reading, because the vitamin interferes with an enzyme in the test strip. So if you do have diabetes, you may want to steer clear of supplements and consider getting your daily dose of vitamin C directly from foods rich in this vitamin, including citrus fruits and berries (just remember to follow your doctor’s dietary recommendations when consuming these foods naturally high in sugar), and from a variety of vegetables.
If you do want to supplement, then use a time-release form of vitamin C and stick to about 250 mgs. daily.
Always check with your doctor if you have a health condition before taking any supplements.