Assertion: melatonin | /r/CapableOf | prevent cancer
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Source sentences:
text: It is also claimed that melatonin is an antioxidant that can boost the immune system and prevent ageing and cancer.
text: As well as regulating sleep, melatonin has also been linked with improving memory, reducing stress, preventing cancers, delaying ageing and decreasing cholesterol levels, however more evidence is needed to support these claims.