2-3 months. It will take at least 2-3 months, and the concentration of the essence will be relatively high. Remember, the dose doesn't need too much. If you use too much, it will easily cause skin discomfort and unnecessary waste. So apply 2~3 drops of essence to your face every time. If the parts around the eyes, corners of the mouth and both sides of the nose turn yellow, the dosage can be slightly increased.