Definition: Ingredients that form a protective layer on the skin or nails to slow down water evaporation. Examples: Mineral oil, petroleum jelly, and silicone oils. Analogy: Think of occlusive agents as a raincoat for your skin or nails. They don’t add water, but they prevent it from escaping. Use in Nail Care: Occlusive oils help keep nails flexible and reduce the risk of cracking by locking in existing moisture.
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