Sure!! While we would love for you to use all of our Mikel Kristi products; we completely understand if you have other favorites you would like to add into the mix! Just determine what step they would fall into, be sure that they don’t contain any ingredients that may be irritating, harmful to the skin, or contradictory to Mikel Kristi ingredients, and mix!! Most commonly, it would be serums you want to cocktail, so if you have one you love, just add a pump in the palm of your hand, add the others, and apply!! Simple as that!