Рандомизированных, слепых, тройных не нашла. Есть вот рекомендации ACS пo этому поводу:
So far, studies of antioxidant vitamin or mineral supplements have not found that they reduce cancer risk. The best advice at this time is to get antioxidants through food sources rather than supplements.
Whether antioxidants or any other dietary supplements are helpful or harmful during chemotherapy or radiotherapy is a critical question without a clear scientific answer at this time. Until more evidence is available that suggests more benefit than harm, it is prudent for cancer survivors getting these treatments to avoid dietary supplements exceeding 100% of the Daily Value for antioxidants.
During and after cancer treatment, there is a probable benefit of taking a standard multiple vitamin and mineral supplement that contains about 100% of the Daily Values because during these times, it may be hard to eat a diet with enough of these nutrients. The use of very large doses of vitamins, minerals, and other dietary supplements is not recommended because evidence exists that some high-dose supplements may increase cancer risk.
There is strong evidence that a diet rich in vegetables, fruits, and other plant-based foods may reduce the risk of some types of cancer, and some recent studies suggest there may be a helpful effect on recurrence or survival for breast, prostate, and ovarian cancers. But there is no evidence at this time that supplements can provide these benefits.
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