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.
Daily Hair Tip
Choose hair care products to suit your specific hair type. Be willing to try several brands until you find a hair care product line that makes your hair look and feel fabulous. Recognize that all hair care products don't always work well on all hair types.