The sudden scrutiny on the properties of the product called Testis compositum came a day after a spokeswoman for Mr. Pistorius named it publicly for the first time.

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The product has antibacterial, antiviral, and anti-fungal properties, and has also been shown in preclinical laboratory tests to have promise against some cancers, particularly skin and brain cancers, while causing little to no side effects, McGuinness said.

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Their own product literature makes only vague and unactionable statements about xanthones having antioxidant properties.

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