The application time and precautions of whitening essence are as follows:
1. The best application time: the whitening essence is best applied at night before sleep, especially between 20:00-22:00 at night. This period is the time when human metabolism is most vigorous, and the skin's absorption capacity will be better, which is conducive to the full absorption of nutrients in whitening essence.
2. Reason for avoiding light: some whitening essence (such as products containing vitamin C, fruit acid and other ingredients) are photosensitive, and use in the daytime may increase the absorption of ultraviolet rays by the skin, thus affecting the whitening effect, and may even make the skin darker. These products need to be used in the dark.
3. Other precautions: Before using the whitening essence, the steps of cleansing and toning should be carried out first to ensure the cleanness and moisturizing of the skin. When smearing, take a proper amount of whitening essence (such as the amount of soybean or pearl size), evenly smear it on the face and neck, and gently massage with finger pulp to promote absorption. After use, you can apply daily basic skin care products such as lotion or face cream as needed to lock moisture and effective ingredients in the skin. It is not recommended to use the whitening essence every day for a long time. It is recommended to use it every two to three days to avoid the skin's immunity and affect the absorption effect. If the whitening essence is not specifically marked not to be used in the daytime, and the ingredients are not sensitive to light, it can also be used in the daytime when sun protection measures are taken. But to avoid unnecessary risks, it is recommended to use it at night as a safer option.