Can IgG help with Sport?

The question of whether IgG can help with sport lacks strong scientific evidence. IgG (immunoglobulin G) is an antibody involved in immune memory. Some companies market IgG tests to identify food sensitivities and guide dietary changes for athletes, but the evidence is weak: IgG to foods often reflects exposure, not intolerance or allergy. Studies showing performance benefits from IgG-guided diets are scarce. Similarly, IgG supplements (e.g., from bovine colostrum) are sometimes promoted to support immunity during heavy training, but results are mixed and not conclusive. For sport performance, proven strategies like adequate macronutrient intake, hydration, and recovery are far more impactful. IgG testing or supplementation should not be relied upon for performance enhancement. If there are specific immune concerns, consult a doctor. Overall, the evidence level is 'marketing/unclear'.