Peptides, Growth Factors, and Exosomes

Peptides, growth factors, and exosomes are becoming some of the biggest buzzwords in skincare, but what do they actually do? Dr. Zain and Courtney break down the differences between these powerful molecules, how they communicate with skin cells, where they come from, and what the current clinical data tells us. The conversation covers collagen supporting peptides, growth factors involved in wound healing and tissue repair, and exosomes as a delivery system for different signaling molecules. They also discuss sourcing, the importance of clinical testing, PDRN, and why the formulation and stability of these ingredients matter. Dr. Zain and Courtney also share some of their favorite products, including SkinMedica TNS, Neocutis, Revision, and Nectifirm. They explain how procedures such as microneedling, RF microneedling, and lasers can enhance the delivery of these ingredients into the skin, and why combining different products may help maximize results. The episode wraps up with a discussion about the importance of looking critically at skincare claims and relying on meaningful clinical data rather than marketing alone. 00:00 Introduction to peptides 01:00 How peptides work with skin cells 02:00 Growth factors and cellular signaling 03:00 What are exosomes? 04:00 What peptides can do 05:00 Where peptides come from 07:00 Clinical data on peptides 08:00 Understanding growth factors 10:00 Clinical evidence for growth factors 11:00 Favorite growth factor products 12:00 Introduction to exosomes 14:00 Why exosomes are so delicate 15:00 Human derived vs plant derived exosomes 17:00 PDRN and emerging skincare ingredients 19:00 Exosomes vs growth factors 20:00 What the clinical evidence says 21:00 Enhancing skincare delivery 22:00 Combining peptides, growth factors, and exosomes 24:00 Why clinical data matters 25:00 Looking ahead in skincare