Myths vs facts: FUT2 and skin aging

FUT2 (fucosyltransferase 2) is best known for determining secretor status – whether you secrete fucosylated antigens into bodily fluids like saliva and gut mucus. A direct, causal link between FUT2 variants and skin aging is not well established in the scientific literature. Some studies suggest an indirect connection: non-secretors (about 20 % of the population) tend to have altered gut microbiota and a higher risk of vitamin B12 deficiency. Since B12 is essential for cell regeneration, a deficiency could theoretically affect skin health. However, the evidence is weak – mostly observational associations without proven causality. Moreover, skin aging is multifactorial, involving UV exposure, lifestyle, and other genetic variants (e.g., MC1R, MMP1). Therefore, FUT2 should not be marketed as a skin-aging predictor. Consumers should focus on proven measures: sun protection, a nutrient-rich diet, and consistent skincare. If you have a FUT2 result from a DNA test, treat it as a curiosity, not a clinical risk factor.