The argument for using a single skin care line is usually to increase the effectiveness of the products. Brands tend to formulate products that work best when used together. There’s a whole science behind formulating cosmetics, and formulators of the same brand know how two or more of their products will work when used in the same routine. Add a product from another line and the outcome could be more dubious.
“Brands typically test their products together,” says board certified dermatologist Yoram Harth, MD. “The chance that products made by the same brand will complement each other is higher than using products from different brands.”
This also reduces the chances of irritation. There are some rules in skin care about ingredients that shouldn’t be layered together, such as retinol and vitamin C. While brands may use ingredients that normally mix across their product range, it’s unlikely that you’ll find them within the same collection.
“When a brand formulates a range of products, they develop them with a similar approach, avoiding incompatible ingredients or conditions and building up efficacy,” explains cosmetic chemist Kelly Dobos. “They also test the products together to ensure all of those criteria have been met.”
Using products that complement each other and decrease irritation sounds great, but there are some drawbacks to sticking to a single skin care brand for every step in your routine. In doing this, Dobos says, “You’re limited to the ingredients and philosophy of the brand.”
Remaining loyal to one brand may give you a case of FOMO. Could there be something better out there for you?