How are CYP1A2 and allergy related?

The relationship between CYP1A2 and allergies is not well established. CYP1A2 is a cytochrome P450 enzyme primarily expressed in the liver, involved in metabolizing drugs, caffeine, and certain environmental toxins. Some research suggests that CYP1A2 may play a role in the metabolism of arachidonic acid, which could influence inflammatory pathways relevant to allergic responses. Certain genetic polymorphisms in CYP1A2 have been associated with altered risk for allergic conditions like asthma or hay fever in some studies, but the findings are inconsistent and effect sizes are small. Importantly, CYP1A2 activity is strongly modulated by lifestyle factors such as smoking and caffeine intake, which can confound genetic associations. For consumers, a DNA test for CYP1A2 variants does not provide reliable information about personal allergy risk. Established risk factors like family history, environmental exposures, and overall lifestyle remain more relevant. The current evidence is mechanistic and insufficient for clinical or personalized recommendations.