Yes. Medications, even nonprescription medications, can have serious side effects. Vitamins, especially when taken in high dose (megadoses, many times larger than the NHMRC recommended daily allowances), are potentially dangerous.
Since vitamin С is water-soluble, you will excrete any excess in your urine. The risks of taking vitamin С pills include
• stomach irritation
• irritation of the esophagus, especially if the vitamin С is taker just prior to lying down
• oxalate kidney stones in people who are at risk
• interference with certain medications, such as Coumadin
•interference with tests for sugar in urine and blood in stool
• miscarriage/fetal deformity
Discuss the use of vitamin С with your oncologist. Specifically, find out whether you have any medical conditions that would affect how much vitamin С you can take safely. There is no general answer to the question “How much vitamin С should I take to prevent any future cancer?” Many people take 1-2 grams (1,000-2,000 milligrams) of vitamin С daily, because they deem this dose safe and effective, but solid recommendations are not yet available.
Vitamin E is a fat-soluble vitamin. Taking more than the NHMRC-recommended daily allowance of vitamin E can be toxic. (Consult your doctor as this varies according to your age, sex and physical condition).
Beta-carotene and carotenoids can impart a yellowish tint to the skin.
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