Is FUT2 useful for stress?

Based on the provided context, there is no evidence that FUT2 is useful for stress. FUT2 is primarily known for determining secretor status and influencing vitamin B12 absorption, not for any direct role in stress response. The context does not include any studies linking FUT2 to stress, cortisol, or psychological resilience. While some indirect connections via gut microbiota (secretor status affects microbiome composition) could theoretically influence the gut-brain axis, this remains speculative and unsupported by the given materials. Consumer DNA tests often include FUT2 in health reports, but the evidence level for stress applications is unclear or marketing-driven. Without human studies or mechanistic data, any claim of utility for stress is premature. Users should focus on evidence-based stress management strategies rather than genetic markers with unproven relevance.