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Are there any substances that affect CGM readings? (Vitamin C/Aspirin)

Vitamin C (Ascorbic Acid)

Vitamin C can falsely raise your sensor's glucose readings. The threshold depends on your sensor:

  • Libre 3 Plus: Taking more than 1,000 mg per day may affect readings. You can take up to 1,000 mg/day and still rely on your sensor for accurate data.

  • Libre 2: Taking more than 500 mg per day may affect readings.
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Vitamin C is found in many supplements, multivitamins, and cold remedies like Airborne and Emergen-C, which can contain 1,000 mg per dose. If you're taking high-dose Vitamin C, be aware that it can stay active in your body for up to 12-24 hours. Consult your healthcare provider if you have questions.

Aspirin (Salicylic Acid)

Salicylic acid, found in some pain relievers like aspirin and certain skin care products, may slightly lower sensor glucose readings. The level of impact depends on the amount active in your body. If you regularly take aspirin, keep this in mind when reviewing your data.


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