Evidence check: IgG Unverträglichkeitstest in the context of fertility

IgG food intolerance tests are often marketed to improve fertility, but the scientific evidence is weak. IgG antibodies indicate immune exposure, not allergy or intolerance. Studies linking IgG levels to fertility outcomes are lacking or of poor quality. Major allergy and immunology societies (e.g., EAACI, AAAAI) advise against IgG testing for food sensitivities. In the fertility context, there is no robust evidence that eliminating foods based on IgG results improves conception rates or pregnancy outcomes. Such tests may lead to unnecessary dietary restrictions, nutritional deficiencies, and increased stress. Evidence grade: marketing/unclear. For fertility issues, evidence-based approaches include hormonal assessment, lifestyle optimization, and medical fertility treatments.