In this study, we focused on "photosynthesis," which supports life on Earth, in order to turn skin-damaging ultraviolet rays into something beneficial. Photosynthesis uses sunlight to produce energy, and in that process, it converts sunlight into visible light. Therefore, we thought that it might be possible to derive effects that are beneficial for the skin by converting ultraviolet light into another light, and pursued further research in this direction. We searched for substances having the property of absorbing ultraviolet light and emitting it at different light energy levels, and identified Spirulina extract and fluorescent zinc oxide from among more than 400 raw materials. These substances had sufficient light intensity and stability and were found to be highly safe.
(1) Dermal cell activation effect of Spirulina extract
It is known that dermal cells (fibroblasts) that produce collagen and hyaluronic acid, which are important for skin (e.g., resilience), are damaged when exposed to ultraviolet light, and their production declines. In this study, we confirmed that converting ultraviolet light to visible light ('skin beautifying light') with Spirulina extract can help recover the activity of dermal cells that have been damaged by ultraviolet light and that the production of collagen and hyaluronic acid is increased compared to levels before ultraviolet light irradiation.
Shiseido Co. Ltd. published this content on 17 November 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 17 November 2021 05:36:04 UTC.