Can CYP1A2 help with fatigue?

CYP1A2 is a gene that controls how quickly your body breaks down caffeine. If you are a 'fast metabolizer', caffeine is cleared rapidly, which may reduce its stimulant effect on fatigue. 'Slow metabolizers' retain caffeine longer, potentially prolonging alertness. However, the link between CYP1A2 and fatigue is indirect and highly individual. There is no strong evidence that a CYP1A2 test alone can effectively address fatigue. Sleep quality, stress, nutrition, and physical activity play much larger roles. A DNA test might offer personal insights, but it is not a substitute for medical evaluation. Caution: high caffeine intake in slow metabolizers can worsen sleep and anxiety. Evidence is mostly mechanistic/unclear, not sufficient for clinical guidance.