Humans fall into urolithin metabotypes: Metabotype Description Approx. Population A Produces UA (best profile) ~40% B Produces UB ± UA ~25–30% 0 Non-producer ~30% ROS Modulation (Context-Dependent) Cancer cells: -Mild ROS ↑ or redox stress → apoptosis, growth arrest Normal cells: -ROS ↓, improved mitochondrial efficiency This duality is why urolithins are less chemo-antagonistic than classic antioxidants. Anticancer Signaling ↓ PI3K/AKT/mTOR ↓ Wnt/β-catenin ↓ NF-κB, STAT3 Cell-cycle arrest (G1/S) Unlike sulforaphane or NAC, urolithins: -Do not strongly upregulate NRF2 in cancer cells -May normalize NRF2 signaling in normal cellsDirect Urolithin A Supplements: Bypass microbiome dependency