Most often, you’ll find rosehip seed oil used as moisturizing agent in various creams and lotions. Really because it has quite high dosage of Vitamin C which helps to form the building block of skin, Collagen, that is. Additionally, it has Oleic acid, an omega fatty acid that makes the skin supple. All these makes oil really essential for aging skins when the production of collagen reduces and you lose moisture out of your skin.