MEDI CHECK Speicheltest: which supplements make sense?

The MEDI CHECK Saliva Test claims to recommend personalized supplements based on saliva samples. However, the scientific evidence for such tests is weak. They typically analyze single biomarkers or gene variants whose impact on actual nutrient needs is often not well-established. Most supplement suggestions rely on correlational studies or mechanistic reasoning, not randomized controlled trials. Moreover, many markers fluctuate with time of day, diet, or stress, limiting the reliability of a single measurement. Without clinical assessment of symptoms, blood values, and individual risk factors, supplementing based solely on such a test is not advisable and may even be harmful (e.g., overdosing or drug interactions). If you have specific symptoms or a confirmed deficiency, a physician-ordered blood test (e.g., vitamin D, B12, ferritin) is far more informative. The saliva test may serve as a rough orientation but does not replace medical diagnostics. Verdict: more marketing than evidence-based medicine.