Hair Biology Revitalize & Soothe Shampoo

• fragrance: Fragrance or parfum, and scent ingredients listed by name, such as linalool and limonene. The most common cause of skincare allergies; worth avoiding if you have eczema, rosacea, or very sensitive skin.
• niacinamide: A popular, well-tolerated ingredient that can cause redness or flushing for a few people, especially at high strengths.

These flags don't affect the pregnancy rating. They point out the ingredients most likely to make skincare sting, itch, or cause a rash. If your skin is sensitive, or one of them has bothered you before, you may want to skip the product or patch-test it first. Most people use them without a problem.