There is no study to support this claim; however, there are so many different products in the market with so many different active ingredients whether it’s for anti-inflammatory, brightening, exfoliating, or moisturizing properties. So, I don’t think it’s a bad idea to rotate several of your favorite products every 3-4 months. For example, try to use products with brightening and UV-protective properties in the summer with a light water-based moisturizer. Then in fall/winter, you can switch to products with more hydrating and moisturizing properties.
