The Science Behind Hydration: Why Skin Feels Dry Even When You Moisturize
Your skin feels tight, flaky, or rough despite applying moisturizer multiple times a day. This frustrating experience is more common than you think, and the root cause often lies in how hydration actually works at a cellular level. Understanding the science can help you choose the right products and routine for lasting moisture. How Skin Hydration Actually Works Healthy skin relies on a delicate balance between water content and the barrier that keeps it locked in. The outermost layer, called the stratum corneum, acts as a protective shield. When this barrier is compromised, water escapes through a process called transepidermal water loss (TEWL), leaving skin dehydrated even if you're applying thick creams. True hydration requires three types of ingredients working together: Humectants like glycerin and hyaluronic acid draw water into skin cells Emollients such as plant oils smooth and soften the skin surface Occlusives, including shea butter and beeswax, create a seal to preven...