A moisturizer is the most fundamental step in a skincare routine. "Oily skin doesn't need moisture" is a myth. Every skin type needs a proper water/oil balance — only the texture and ingredients suited to each type differ.
The 3 mechanisms of moisturizing
By how they work, moisturizers fall broadly into three categories.
1. Humectants — pull in moisture
They draw water from the air or dermis into the stratum corneum.
- Hyaluronic acid: holds up to 1,000x its weight in water
- Glycerin: cheap and effective, suits all skin types
- Panthenol (vitamin B5): hydration + soothing
2. Occlusives — prevent water loss
They form a thin film on the skin surface to curb TEWL.
- Petrolatum: the most effective occlusive, ideal for dry/sensitive skin
- Dimethicone: silicone-based, light texture
- Squalane: skin-friendly, doesn't clog pores
3. Emollients — soften the skin
They fill lipids between corneocytes to smooth the skin.
- Ceramides: refill barrier lipids
- Shea butter, jojoba oil: supply rich lipids
How to choose a moisturizer by skin type
Dry skin
Needs: ample occlusives + emollients + humectants
Recommended texture: cream, balm cream, oil
Recommended ingredients: ceramides, hyaluronic acid, shea butter, squalane, glycerin
Avoid: high-alcohol products, using only light water gels
Oily/acne-prone skin
Needs: light humectants + non-comedogenic occlusives
Recommended texture: water gel, essence, fluid
Recommended ingredients: hyaluronic acid, glycerin, niacinamide, dimethicone
Avoid: cocoa butter, coconut oil, lanolin (comedogenic ingredients)
Combination skin
Manage the T-zone and U-zone differently, or choose an emulsion/lotion with high hydration but moderate occlusion. Applying a light gel to the T-zone and a cream to cheeks and jawline separately also works well.
Sensitive/barrier-damaged skin
Needs: high-ceramide content + a simple ingredient list
Recommended ingredients: ceramides, cholesterol, fatty acids (the golden ratio = 3:1:1)
Avoid: fragrance, ethanol, colorants, complex ingredient blends
Application order and layering
Apply moisturizer as soon as possible after cleansing (within 3 minutes). The layering order is generally from lighter, more hydrating textures → heavier, oilier textures.
Toner/essence (humectant) → serum → lotion/emulsion → cream (occlusive) → sunscreen
Applying cream right after a serum efficiently seals in the serum's moisturizing ingredients.
Seasonal moisturizing strategy
Summer: A light water gel or hydrating serum is often enough. Use your sunscreen's moisturizing function too.
Winter: Even for the same skin type, upgrade to a cream, or mix a small amount of an idol cream or squalane oil into your usual lotion.
Moisturizing is the most basic routine yet has the biggest impact on skin condition. Even fancy functional ingredients struggle to perform without a moisturizing foundation.