5% vs 10% de niacinamide : la VRAIE différence (études à l'appui)

10% niacinamide for it to "work"? You've been misled. Because studies show SOLID results at concentrations as low as 2-5%. But nobody tells you that. Why? Because "10%" sells. In this video, I PROVE to you why "more" is NOT "better" with niacinamide. Scientific analyses, clinical studies decoded, and the truth about the concentrations that ACTUALLY work. ✅ What you'll discover: Why 5% niacinamide is enough (Bisset 2004, Draelos 2005 studies) The 4 real actions of niacinamide on your skin Why 10%+ is NOT more effective (clinical data) The REAL reasons for irritation 3 recommended products (from €6 to €20) Mistakes to absolutely avoid ⚠️ DISCLAIMER: This video is NOT sponsored. Objective analyses based on my experience as a cosmetic formulator. 📌 TIMESTAMPS: 00:00 - Intro: What is niacinamide? 01:29 - The REAL figures (scientific studies) 03:00 - Why "more" isn't "better" 05:38 - How to use it correctly 07:45 - My product recommendations 07:57 - Mistakes to avoid 09:16 - Conclusion 📚 SCIENTIFIC SOURCES: Bissett et al., 2004 - 5% efficacy on hyperpigmentation Draelos et al., 2005 - Barrier effects from 2% Gehring, 2004 - Tolerance and concentrations Matts et al., 2002 - Multi-target effects (All full references in the pinned comment) 💬 TELL ME IN THE COMMENTS: What percentage of niacinamide are you currently using? 👉 SUBSCRIBE for no-nonsense scientific breakdowns every week! Next episode: I'm dissecting YUKA (and why a 100/100 product can be terrible for YOUR skin) 🔥 🌐 FIND ME: Instagram:   / cosmady   TikTok:   / cosmady   Email: [email protected] 🎨 THUMBNAIL BY: @yelocut Instagram: https://www.instagram.com/yelocut/?__d=1 Portfolio: https://www.yelocut.com/ #niacinamide #skincare #cosmetics #skincareroutines #theordinary #cosmeticingredients #formulator #cosmeticscience #frenchskincare #beauty #hyperpigmentation #acne #oilyskin #skincarekorean #serum