Healthy, glowing-looking skin starts with hydration — not products layered on top of dry skin.
The Basics
Your skin's outer layer (the stratum corneum) holds onto water using natural moisturizing factors (NMFs) — compounds that attract and hold water in the skin.
Two things matter most:
- Water loss (TEWL) — water naturally evaporates from skin. When the skin barrier is damaged, this speeds up, causing dryness. This is a bigger issue for people with sensitive skin or eczema.
- Lipids — natural oils that form a barrier and lock in moisture. Damage this barrier (harsh soap, hot water, environment) and hydration drops.
What Affects Your Skin's Hydration
Environment
- Dry air, cold weather, and sun exposure increase water loss
- Humidity helps skin hold onto moisture
Lifestyle
- A diet with enough fruits, vegetables, and healthy fats supports skin health
- Sleep and stress management affect skin barrier function
Water quality
- Chlorine can disrupt the skin's oil layer, increasing water loss
- Hard water (high mineral content) can also strip moisture and leave residue
What Actually Helps
- Lower your shower water temperature. Hot water speeds up water loss.
- Use a mild, fragrance-free cleanser. Avoid harsh scrubbing.
- Moisturize immediately after showering, while skin is still damp — this is when moisturizer works best.
- Drink water and eat well. Internal hydration supports skin from the inside.
- Use a humidifier in dry climates or heated/air-conditioned rooms.
- Consider your water quality if dryness persists despite good habits. Test for chlorine and hardness before assuming a specific fix will help — different problems need different solutions.
Bottom Line
Hydration depends on your skin barrier, your environment, your habits, and your water quality — no single step does it all. If you have persistent dryness, sensitive skin, or eczema, a dermatologist can help you figure out what's actually driving it.