Rosehip oil contains a wealth of essential fatty acids, including linoleic and linolenic acid. Fatty acids help to keep cell walls strong so that they donâ€™t lose water. Rosehip oil is rich in vitamins A and C, which are both necessary for the production of collagen. Rosehip has also been shown to inhibit the creation of MMP-1, an enzyme that breaks down collagen in the body.Rosehip oil is generally safe for all skin types, but allergic reaction is not uncommon. Rosehip oil is rich in antioxidants and polyunsaturated fatty acids, like linoleic acid, which are imperative for preventing the breakdown of cell membranes in the skin. Strong, healthy cells act as a barrier to prevent bacteria from invading the skin, which can lead to outbreaks and infections.