Vitamin C is a water soluble vitamin found in citrus fruits. It is very easy to make vitamin c serum from orange peel powder. Just follow the simple steps,  Break orange peels into small size pieces.  Allow to air dry for at least 3 days.  When orange peels are thoroughly dry, pulverise them in a spice grinder until it becomes a fine powder.  In a bowl, add in aloe vera gel, orange peel powder, rosewater and vitamin E oil.  Add vitamin E oil to reduce the oxidation of vitamin C and it also improves the shelf-life of the final product.  Stir the mixture until it gets fully dissolved.