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

The Body-Balance Check | Testosteron-Test is a blood test measuring total and free testosterone, SHBG, prolactin, and albumin. Its marketing promises 'inspiring suggestions for nutrition, training, and recovery' but makes no direct claim about gut health. A common myth is that a single testosterone test can assess gut health. The fact is: the gut influences hormone metabolism via the gut–brain axis, microbiota, and enterohepatic circulation of steroid hormones. Studies indicate that a healthy microbiome may be associated with higher testosterone levels (e.g., through regulation of inflammation and β-glucuronidase activity). However, this test does not measure gut markers such as stool composition, inflammatory cytokines, or microbiome diversity. The evidence for a causal link between gut health and testosterone is moderate, but insufficient to infer gut status from a single blood draw. Moreover, testosterone levels fluctuate diurnally and are affected by stress, sleep, and exercise. Marketing language should be separated from scientific evidence: the test provides useful hormone data, not a gut health assessment. A comprehensive approach – including lifestyle, diet, and clinical follow-up – is essential.