Moisturizer (Skincare)

Moisturizer is not one thing but a blend of three ingredient classes, and whichever dominates decides how the product behaves. Humectants such as glycerin and hyaluronic acid pull water in. Emollients such as squalane and fatty alcohols fill the gaps between surface cells and make skin feel smooth. Occlusives such as petrolatum and dimethicone lay a barrier on top so that water cannot evaporate.

Ratio explains the whole shelf. Gel formulas lean on humectants with almost no occlusive, so they feel weightless and accomplish very little in dry air. Lotions balance all three in a water-heavy emulsion, spread easily and suit most skin for most of the year. Creams carry more oil and occlusive, sitting longer on the surface, which is what dry skin needs through winter. Ointments and balms are nearly all occlusive and stop water loss almost completely. They belong on cracked hands and lips rather than on a whole face.

Serum comes before it, thin and concentrated on one job, and moisturizer is what stops that serum's water and actives evaporating. This is exactly why a serum used alone underperforms. Around the eye the same idea runs at lower strength, with a shorter ingredient list and fewer fragrances, because that skin is thinner. Sunscreen goes on top and usually moisturizes as well, which is why plenty of people can drop a separate morning cream in summer.

Even oily skin needs moisturizer, though a gel or light lotion is enough, because stripped skin steps up oil production to compensate. Cold, heated indoor air calls for a cream with a real occlusive, as a humectant-only gel in dry air can draw water up from deeper skin and lose it. Skin using retinoids or acids needs more occlusive than it did before, since those actives raise water loss through the barrier. Stinging from new products points toward a short ingredient list without fragrance rather than toward anything labeled for sensitive skin.

Damp skin within a minute of washing is the right moment, since the humectants then have water available to hold onto. Results take about a week of steady use, because barrier repair happens across days rather than minutes. Pilling usually means you layered over a silicone product or simply used too much, not that the cream is faulty. Fingers in an unpreserved jar shorten its life, so use a spatula or buy a pump.