This page contains information that may not be medical advice and is not a substitute for medical care. Always seek the advice of your physician or other qualified health care professional before taking any drug, including prescription or over-the-counter drugs. If you believe that you have been affected by a drug, stop taking that drug immediately and consult a qualified health care professional. Read the entire Drug Interactions/Emergency page. If you have questions, or would like to receive more information or support regarding a specific medicine, please click on the link below to contact the Drug Interactions Information Service for more information: Vitamin C Vitamin C is also a component of the vit C complex, which is used in the manufacture of vitamin C products. The vit C complex includes vitamin C, ascorbic acid, and ascorbyl palmitate. There are many products that contain vit C. These include Vitamin C tablets, capsules, or liquid supplements. The Food and Drug Administration (FDA) has not classified any of these products as safe and effective for the prevention or treatment of varicose vein disease (VVD) in adults. However, some of these products do contain vitamin C. Some individuals should discuss with their healthcare provider whether a particular product contains vitamin C.