Aloe glycoside and aloe-emodin in fresh aloe juice are also photosensitive substances that can absorb a large amount of ultraviolet rays in sunlight and convert them into another substance - photochemical products. Photochemical products are then combined with proteins in the skin to become whole antigens. The whole antigen formed by photosensitive substances has strong antigenicity and can easily cause skin allergies. At the same time, this photochemical product will accumulate on the surface of the skin. If exposed to the sun for a long time, it will easily oxidize and turn black. This is why some people If you use aloe vera gel that has not been separated and purified, your skin will turn darker.

Generally, when using aloe vera for skin care, the aloe vera is peeled and the mesophyll part is obtained for skin care. However, because there are many ingredients in aloe vera, some of the ingredients may have side effects. Therefore, only through scientific analysis of ingredients, separation and purification of effective skin care ingredients, and removal of toxins and photosensitivity components can skin care be carried out in a targeted and efficient manner.

If there is no scientific separation and purification, it is still recommended to do a skin test before use. Otherwise, it will be troublesome to cause allergies. Also, avoid direct sunlight when using.