It is usually not advisable to make your own serum, because unlike other skincare products, these are concentrated and require a high level of skill and knowledge to come up with. However, if you are really unable or unwilling to afford a store bought serum, you can always make this at home. Take two tablespoons rosehip seed oil and mix it with about 10 drops of neroli oil or carrot seed essential oil. Stir well and store in an airtight container. Apply a thin layer with your fingertips and massage into the skin. This can be used both morning and night. Rosehip seed oil helps in collagen production, as well as reducing skin inflammation and other problems. The essential oil dilutes and helps hydrate.