The Science Behind White Cast and Sunscreen Inclusivity with AJ Addae

Send us Fan MailIn this episode of Skin Anarchy, award-winning cosmetic chemist and clinical researcher AJ Addae joins Dr. Ekta Yadav for a science-driven conversation that challenges one of skincare’s biggest blind spots: why sunscreen still fails so many consumers—especially those with deeper skin tones. What unfolds is a deeper look at formulation chemistry, particle optics, and the gap between sunscreen marketing and how these products actually perform on real skin. AJ shares how her own experiences growing up as a dark-skinned daughter of immigrants shaped her relationship with beauty and science. Long before becoming a cosmetic chemist, she was already questioning why products weren’t designed with melanin-rich skin in mind. That curiosity eventually led her into formulation science, where she began investigating the physical behavior of mineral UV filters like zinc oxide and titanium dioxide. A central focus of the episode is the science behind white cast. Rather than treating inclusivity as a marketing issue, AJ explains how particle aggregation, light scattering, and suspension stability directly influence how sunscreen appears on the skin. Her research into specialized zinc oxide “tetrapod” structures reveals how changing particle shape—not just adding tint—may significantly improve wearability across skin tones while maintaining UV protection. The conversation also dives into the limitations of SPF testing, the misunderstanding of hyperpigmentation, and why aggressive skincare often worsens long-term skin health instead of improving it. Throughout the episode, AJ advocates for a more rigorous, transparent, and evidence-driven future for cosmetic chemistry. Listen to the full episode to hear AJ Addae break down the science of sunscreen, inclusivity, and why meaningful beauty innovation starts in the lab—not in marketing.Learn more about Sula Labs and AJ AddaeDon’t forget to subscribe to Skin Anarchy on Apple Podcasts, Spotify, or your preferred platform.Reach out to us through email with any questions.Sign up for our newsletter!Shop all our episodes and products mentioned through our ShopMy Shelf!Support the show