Product Safety
How to Introduce New Skincare Products, One at a Time
Introduce one cosmetic product at a time: read its directions, check suitability, and complete an appropriate small-area test before wider use.
Product Safety
A familiar ingredient or reassuring label cannot guarantee that every person's skin will tolerate a product. Formulas and individual responses differ. These guides focus on small-area testing, label directions, one-change-at-a-time routines, and knowing when to stop and seek professional help.
Product Safety
How to Patch Test a Skincare Product
Before using a new skincare product widely, apply the normal amount to a quarter-sized spot on the underside of your arm or bend of your elbow twice daily…
Product Safety
How to Use Retinol in a Simple Routine
Use an over-the-counter retinol product at night after gentle cleansing, in the amount and area directed by its label.
Product Safety
Skincare Patch-Test Instructions: Compare Brand Guides
The Ordinary and The INKEY List publish step-by-step patch-test guides; CeraVe's label explainer helps interpret claims but does not supply a complete…