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Hi Jen, the Libre gives readings which are incorrectly too high. I'm not sure just how much vit C you need to be taking to notice this. I take 2g (ie 2000mg) a day and this seems to cause readings to be up to 4mmol/l too high (confirmed with a blood check). Generally though they're about 1-2...

One difference between the Libre and Dexcom devices is that the FreeStyle Libre devices are affected by vitamin C, if you take that as a supplement, whereas the Dexcom ones are not.