Used only once. This oil-based beauty serum moisturizes the skin. RMK W Treatment Oil 20mL (Beauty Oil, Face Oil, Pre-serum, Lotion, Moisturizing Ingredients: <Argan Oil, Rosehip Oil, Jojoba Oil> Oil Massage) Shake the two layers of oil up and down to mix them together and use it ✨ - Brand: RMK - Product Name: W Treatment Oil - Capacity: 20mL - Country of Manufacture: Japan - How to Use: Oil-based beauty serum Thank you for viewing.