Is Cotton Seed Oil Bad for You? At SeedOilNews, we help people who are seed oil curious by collating information and news about seed oils. Cotton seed oil is a type of vegetable oil. It contains polyunsaturated fats like linoleic acid that help lower inflammation, improve heart health, and strengthen immune function. Olive and avocado oils also contain monounsaturated fats to help lower cholesterol levels and protect against cardiovascular disease, and their fatty acids are similar to those found in popular vegetable oils like olive and avocado oils.