The term Kryptopyrroluria (KPU) refers to a metabolic peculiarity. Affected individuals often do not notice this peculiarity for many years. Symptoms can suddenly arise at some point in life, often triggered by specific circumstances (such as high levels of stress, puberty, pregnancy). The main problem is that due to this metabolic change, there can be a constant and high loss of essential vitamins B6, zinc, and manganese. The KPU test is particularly suitable for burnout, ADHD, and exhaustion depression patients.