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Details For: Allergen

Term  
Allergen

Definition  
A substance which is normally harmless that provokes an immune response and thus and allergic reaction. While some people have no reaction to pollen, others may have an allergic reaction. The same is true for a wide range of scents, odors, foods and natural substances.

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To keep bad hair days at bay, get regular trims and condition your hair, at least the ends, every time you shampoo.