What role does Leaky Gut Test play in fertility?

The role of a Leaky Gut Test in fertility is not well-established by scientific evidence. The concept of increased intestinal permeability („leaky gut“) is linked to chronic inflammation and autoimmune conditions, which may theoretically affect fertility. However, there are no standardized, validated clinical tests for leaky gut, and most commercial tests (e.g., zonulin or lactulose/mannitol) lack robust evidence. While gut health can influence fertility through nutrient absorption, immune regulation, and microbiome composition, a single test does not provide actionable guidance. The evidence is mostly mechanistic or based on small observational studies. For fertility assessment, established methods like hormone panels, ultrasound, or semen analysis are far more relevant. A leaky gut test should not be used as a standalone tool for fertility decisions.