This week's episode is a 101 on cosmetics formulations; what are the ingredient types that make your products work and why? What's up with surfactant and preservative systems? What's the difference between skin and hair care, what's an emulsion, and what do you need to know about pH? o help me cover the topic, this week featured Ava Perkins, PhD student at the University of Cincinnati in their cosmetic science program.

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