Evidence check: Omega-3 Index in the context of Haut

The Omega-3 Index measures EPA and DHA in red blood cells and is a validated biomarker for cardiovascular health. For skin health, the evidence is much weaker. Some studies suggest higher omega-3 intake may improve inflammatory skin conditions like acne, psoriasis, or atopic dermatitis by reducing pro-inflammatory eicosanoids and cytokines. However, the Omega-3 Index itself has not been specifically validated for skin outcomes. Most data come from observational studies or small trials; large randomized controlled trials using the index as a primary endpoint for skin are lacking. Individual factors such as genetics (e.g., FUT3 variants affecting fucosylation and skin barrier function), microbiome, and overall diet also play a role that the index does not capture. A MyBody-X test can measure omega-3 status, but interpreting it for skin remains speculative. Without accompanying clinical assessment, one should not base supplement decisions solely on the index. Evidence: unclear, leaning mechanistic/marketing.