The way to use CORE Night Serum is usually as the last step in your evening skincare routine, after cleansing and toning. Pour an appropriate amount of essence into the palm of your hand, and gently pat on the face and neck until fully absorbed. It is recommended to use every night for optimal skin care results. The usage and dosage of different brands of products may be different. You should read the product instructions carefully and use them according to the instructions. It should be noted that everyone's skin condition and needs are different, so different groups of people may need to choose different evening skin care products. If you have specific skin concerns or needs, it is best to consult a professional skin care practitioner or doctor for more precise advice and recommendations.