A viral social media video claims selenium—an essential mineral we get through food—is an effective anti-cancer substance. But the evidence doesn’t show it to be beneficial in preventing or treating the disease.
It’s unclear whether the video is saying that selenium reduces the risk of developing cancer, or is effective at treating cancer once it exists. was published in 2018 and found that “there is no evidence to suggest that increasing selenium intake through diet or supplementation prevents cancer in humans”. This included prostate cancer specifically, which was the cancer most commonly looked at in the studies found.
The review does note that “more research is needed to assess whether selenium may modify the risk of cancer in individuals with a specific genetic background or nutritional status, and to investigate possible differential effects of various forms of selenium.”but there are also some findings of increased cancer incidence associated with certain genetic changes alongside selenium supplementation.
In mentioning prostate cancer, the video may be referring to lower quality evidence linking selenium supplementation in people who are very deficient in the mineral with a lower prostate cancer risk. This was noted in anThe video also mentions lung cancer. Memorial Sloan Kettering Cancer Centre , a US cancer research and treatment institution that provides information about alternative treatments,
some data suggesting a potential link between selenium and reduced gastrointestinal and lung cancers.However, the later Cochrane reviews are stronger evidence than this.Larger, higher quality evidence like Cochrane reviews are lacking regarding use of selenium as a treatment. But this doesn’t mean that selenium can be recommended to treat cancer.
While this isn’t conclusive, there is a risk of possible harm, and promoting selenium as a treatment without being clear about the extent of the evidence behind it could damage people’s health.
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