Phytosphingosine must be dissolved in oil. which in the formula does not contain oil Therefore, it cannot be mixed in this formula.Pro Polymer 1.5 Phytosphingosine 1 Natto Gum 5 Rice Vitamin 2 Natural Moisturizing Amino Acids 5 Sodium PCA 5 Butylene Glycol 5 Witch Hazel (Alcohol Free) Plus Allantoin 20 Panthenol (Pro Vitamin B5) 1 The rest water needs a moisturizing face gel. Light