That claim is misleading. Beetroot juice is nutritious, but there is no good clinical evidence that drinking it kills cancer cells in humans within 42 days.
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Beetroot contains compounds such as betalains and nitrates that are being studied for antioxidant and other biological effects.
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Some laboratory and animal studies have reported effects on cancer-related cells or pathways, but effects in a laboratory dish do not establish that beetroot juice treats cancer in people.
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There is no established 42-day beetroot-juice treatment that has been shown to eliminate cancer.
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Beetroot juice should not replace chemotherapy, radiation, surgery, immunotherapy, or other evidence-based cancer treatment.
If the “tip in the comments” recommends a specific recipe or dosage, paste it here and I can check what the ingredients actually do, whether the claimed evidence exists, and whether there are any safety concerns.
