According to a Facebook live with Dr. Ivana Veljkovic, PCA Skin's Director of R&D at the time, their EGF is produced in a lab using vector DNA. The vector DNA is completely identical to the signaling molecule responsible for human epidermal growth factor, but is synthesized and is in no way derived from a human or animal source. The vector DNA is then inserted into bacteria, which is then fed glucose, or sugar. The bacteria act as a factory, creating exact replicas of the vector DNA signaling epidermal growth.