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Additional references

The case against multivitamins grows stronger - NPR
Evidence continues to mount that vitamin supplements don't help most people and can cause diseases that people are taking them to prevent, like cancer. Even people who know about all these studies showing no benefit continue to buy multivitamins for their families. So how is this still a multi-billion dollar industry?

Medical journal: 'Case closed' against vitamin pills - USA Today
Vitamin industry and some researchers disagree that 'enough is enough' when it comes to supplement studies.