Linoleic acid is an essential fatty acid that plays a crucial role in human health. Here's a concise description:

1. **Chemical structure:** It's an 18-carbon polyunsaturated fatty acid with two double bonds (18:2 ω-6).
2. **Classification:** Omega-6 fatty acid.
3. **Essentiality:** Cannot be synthesized by the human body, must be obtained through diet.
4. **Dietary sources:** Found in vegetable oils (e.g., sunflower, safflower, soybean), nuts, and seeds.
5. **Functions:**
    - Component of cell membranes
    - Precursor for arachidonic acid and eicosanoids
    - Involved in skin health and barrier function
    - Important for growth and development
6. **Recommended intake:** 12-17 grams per day for adults, depending on gender and total caloric intake.

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