There is no evidence to support claims recently made online that vitamin D is “the most effective medicine against cancer” or that taking the vitamin prevents cancer or lowers the odds of dying from the disease, according to scientific analyses. In a follow-up analysis of the data (here ) , the same team found that taking vitamin D was associated with lower incidence of advanced cancers, but only among normal-weight individuals. If it can be confirmed, they said vitamin D might help slow cancer progression at lower cost than current cancer drugs,“Even if vitamin D effects were modest, vitamin D supplementation at the studied levels is much less toxic and lower cost than many current cancer therapies.”The researchers, however, did not suggest it would be more effective than existing cancer treatments. There is no evidence that vitamin D prevents cancer, or treats cancer more effectively than existing medicines. A large research review found no effect on cancer incidence or mortality from taking vitamin D. A large clinical trial found a possible slowing of cancer progression in people who do develop tumors, and concluded that if the effect could be confirmed, vitamin D might provide a “modest” benefit.

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