Hi, I would like to know if it is permitted to apply serums and other face treatments on Shabbat. For example hyaluronic acid Is a moisturizer, elastin is antiaging, collagen regenerates cella, vitamins enriches the skin. All these face treatments are very liquid. Which would be OK to use? If any. Thanks a lot.

They are considered medicines, and accordingly, should be applied immediately before and after Shabbat, unless a doctor thinks otherwise, and then an halachic authority would need to hear all of the details involved.