Myths vs facts: Body-Balance Check | Testosteron-Test and Müdigkeit

The myth that a saliva or DNA test can reliably diagnose low testosterone or explain fatigue is widespread. The fact: Testosterone is measured in blood, not saliva, and certainly not via DNA SNPs. MyBody-X offers DNA tests that may include variants linked to metabolism or hormones, but effect sizes are tiny. Fatigue has many causes—poor sleep, stress, iron deficiency, thyroid issues, or psychological factors. A genetic test cannot replace clinical diagnosis. Even if a SNP is associated with lower testosterone, its predictive value is minimal. The evidence for such direct-to-consumer tests is mostly marketing. Anyone experiencing real fatigue and hormonal concerns should see a doctor and get a blood test. A DNA test alone often leads to confusion or misguided self-experimentation.