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This isn't fooling the FDA

Shang, Lapatinib acts against biofilm formation and the hemolytic activity of Staphylococcus aureus, ACS Omega 7 (10) (2022) 90049014

This functional suppression appears to be linked to an amplified systemic inflammatory response with serious clinical consequences such as hypotension and multiple organ failure [18]

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An earlier short-term randomized trial did not find significant changes in several oxidative-stress measures

Your body has natural antioxidant systems designed to keep pace with your normal low-level fat-burning systems (walking and at rest) and even your occasional ATP-based "life or death sprint" systems, but it really wasn't designed to compensate for hours of high-level aerobic performance