Written on the 10 July 2016 by YSCP
A number of drugs are known to lower vitamin C levels, thus requiring an increase in its intake.
Estrogen-containing contraceptives (birth control pills) are known to lower vitamin C levels in plasma and white blood cells. Aspirin can lower vitamin C levels if taken frequently. There is some evidence, though controversial, that vitamin C interacts with anticoagulant medications, (blood thinners), like warfarin.
High doses of vitamin C have also been found to interfere with the interpretation of certain laboratory tests (e.g., serum bilirubin, serum creatinine, and the guaiac assay for occult blood). It is therefore important to inform one's health care provider of any recent supplement use.
Citations and References may be found here.