Can LCT help with Allergie?

The question whether LCT can help with allergies stems from a common confusion. LCT encodes lactase, the enzyme that digests lactose (milk sugar). Genetic testing for lactase persistence (LCT variants) only indicates whether someone can digest lactose. An allergy is an immune reaction to milk proteins (e.g., casein), not to lactose. Lactose intolerance and milk allergy are fundamentally different. An LCT test can help clarify symptoms like bloating or diarrhea after milk consumption – but these are not allergic reactions. Anyone with true allergy symptoms (rash, breathing difficulty, anaphylaxis) needs an allergist evaluation, not a lactose gene test. Evidence linking LCT to allergy is absent; the test is useful for differential diagnosis but not for allergy management. Caveat: Do not confuse lactose intolerance with milk allergy – this can be dangerous.