Oleic acid is the main omega-9 fatty acid, a type of monounsaturated fat. Your body makes its own omega-9s, so you don't need them from food. Supplements usually deliver high-oleic oils from olive, avocado, or specific nuts.
Claims about heart health and skin moisture stem from whole foods like olive oil in a Mediterranean diet, not from omega-9 pills. Current evidence does not back any specific use for purified omega-9.
Take these supplements with a meal to improve fat absorption. No standard dose exists