Is Nährstoffcheck useful for gut health?

A nutrient check typically measures blood levels of vitamins, minerals, and trace elements. While deficiencies (e.g., vitamin D, zinc) can affect gut health indirectly, such a test does not assess the gut microbiome, intestinal permeability, or inflammation. There is no strong evidence that a standalone nutrient check improves gut health outcomes; most claims are marketing-driven. It may be useful as a screening tool for deficiencies, but it is not a diagnostic for gut health. For a comprehensive assessment, stool analysis, breath tests, and clinical evaluation are more appropriate. Evidence grade: marketing/unclear. Caveat: Normal nutrient levels do not guarantee a healthy gut.