Undecylenyl Alcohol

Synthetic fragrances are lab-made scent compounds added to give products a pleasant smell. The specific ingredients are rarely disclosed on the label, and they're a leading cause of skin irritation, sensitization, and allergic reactions, particularly for sensitive skin.

Fragrances make products smell appealing but are a common cause of skin irritation and allergic reactions. This includes synthetic fragrances, natural fragrances, and essential oils. Fragrance-free products are the safest bet for sensitive skin.