RCT: Multivitamins not beneficial for the prevention of cancer.

Multivitamins in the prevention of cancer and cardiovascular disease: The COSMOS randomized clinical trial – American Journal of Clinical Nutrition

Commentary: Daily Multivitamin Does Not Cut Cancer Incidence in Older Adults – HealthDay

Related: USPSTF Draft Statement: Insufficient evidence to recommend multivitamin supplements for the prevention of CVD or cancer. The statement also recommends against the use of beta-carotene (increases risk of CVD mortality and lung cancer) or vitamin E (clear evidence of no benefit)