Myths vs facts: CYP2C19 and Müdigkeit

CYP2C19 encodes a liver enzyme that metabolizes certain drugs (e.g., clopidogrel, proton pump inhibitors, some antidepressants). There is no direct, evidence-based link between CYP2C19 variants and fatigue per se. The myth likely arises because 'poor metabolizers' can have higher drug levels and thus experience more side effects like fatigue when taking relevant medications. Without drug intake, CYP2C19 has no known effect on energy levels. A consumer DNA test alone cannot explain fatigue. Always consult a physician before making health decisions based on such genetic results.