Myths vs facts: CYP1A2 and allergy

Claims linking CYP1A2 genotype directly to allergies are not supported by strong evidence. CYP1A2 primarily influences caffeine metabolism (rs762551). Some marketing materials suggest a connection to histamine or allergic responses, but no robust human studies confirm a causal link. Allergies are multifactorial, involving many genes, environmental triggers, and immune pathways. A DNA test for CYP1A2 cannot diagnose or predict allergies. The evidence is weak and largely speculative. Consumers should rely on clinical allergy testing (e.g., skin prick tests, specific IgE) rather than direct-to-consumer genetic tests for allergy assessment.