Evidence check: NutriCare | INFINITY DNA-Test in the context of fatigue

The NutriCare INFINITY DNA-Test claims to identify genetic factors contributing to fatigue. However, the scientific evidence is weak. Fatigue is a multifactorial symptom influenced by sleep, stress, diet, exercise, mental health, and medical conditions (e.g., anemia, thyroid disorders). Genetics plays a minor role. Most variants tested (e.g., in MTF1, SOD2, IL6) have small effect sizes from underpowered or unreplicated studies, and are not clinically predictive. Consumer DNA tests for fatigue are not validated for diagnosis or treatment guidance. A proper medical workup is essential. The evidence level is 'marketing' or 'mixed', as claims exceed actual utility.