Shereene Idriss explains why ceramides matter for skin. They strengthen your barrier and help it hold onto water, unlike humectants or collagen which can't fix crepey skin on their own.
Moisturizing is key, but not all moisturizers are created equal. Humectants are not going to be the holy grail that are going to plump up your skin to make the crepey skin disappear. And do not be fooled by marketing collagen. Enriched moisturizers that have pure collagen are not going to reverse the look of crepey skin either. Instead, you want to look for a slew of other ingredients, one of them being ceramides. Ceramides are like the glue that hold the superficial skin cells together, creating a nice barrier that minimizes water loss from your skin so that your skin can retain the hydration and moisture that you are putting on your skin.
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