Spa Treatment Insert Gel ASpa Treatment Insert Gel A Stem Cell & Spicule Base Gel Spa Treatment Insert Gel A is a professional grade base gel from one of Japan's leading aesthetic skincare brands. It is designed to be applied as a first step "inserted" into the skin to prepare and amplify the absorption of the serums and creams that follow. The formula combines two powerful technologies: microspicules (microscopic marine sponge fibres that create micro channels in the skin's