Stem cells have become commonplace in the cosmetics industry, but remain slightly unfamiliar to the general public. In this video, I describe the various types of stem cell actives and how they are used in some of my favorite growth factor anti-aging serums. These include Medik8 Growth Factor ($160 in the shop); AQ Eye Serum ($99 in the shop); Stemulation Facial Serum ($135); and ReLuma Skin Illuminating Serum ($145).