Details
The unfancy name for it is lye. It’s a solid white stuff that’s very alkaline and used in small amounts to adjust the pH of the product and make it just right.
For example, in case of AHA or BHA exfoliants, the right pH is super-duper important, and pH adjusters like sodium hydroxide are needed.
BTW, lye is not something new. It was already used by ancient Egyptians to help oil and fat magically turn into something else. Can you guess what? Yes, it’s soap. It still often shows up in the ingredient list of soaps and other cleansers.
Sodium hydroxide in itself is a potent skin irritant, but once it's reacted (as it is usually in skin care products, like exfoliants) it is totally harmless.
Products with Sodium Hydroxide
                        
                            Beyond Perfection Original Goat Milk Soap - Soap Bar Formulated With Kojic Acid And Vitamins A, C & E
                        
                            Dear Doctor Oatmeal Soap
                        
                            Klairs Gentle Black Sugar Charcoal Soap
                        
                            Nivea Oil In Lotion Cherry Blossom & Jojoba Oil
                        
                            Anua Azelaic Acid 15 Intense Calming Serum
                        
                            Base Daily Radiance & Multi-protection Serum
                        
                            Beauty Drops Aha 30% + Bha 2% Peeling
                        
                            Belo Glycolic Soap 10℅
                        
                            Bobana Skin Lightening Cream
                        
                            DMD Skin Sciences Azelane Soap
                        
                            DR. SOUL Dark Spot Eraser Whitening Soap
                        
                            Dermal Therapy Acne Control Lotion
                        
                            Dermorepubliq Power White Body Bar
                        
                            Dr Bronner Pure Castille Bar Soap (unscented)
                        
                            Geisha White Scar And Blemish Skin Brightening Bar Classic
                        
                            Honest Glow Glow 190 Rejuvenating Soap
                        
                            INNO-DERMA Βeta Purifying 24h Cream
                        
                            Ivana Skin Purifying Charcoal Bar
                        
                            Klairs Rich Moist Facial Soap
                        
                            Kruidvat Bodylotion Sensitive Almond Oil
                        
                            Lana Age Defying Soap
                        
                            MAGARA SKIN Cuffu Buff
                        
                            Mestiza The Healthy Skin Soap Original
                        
                            My dream skin Collagen + Niacinamide Intense Whitening Soap
                        
                            PURA D'OR Colorharmony Purple Shampoo
                        
                            Patanjali Mogra Body Cleanser
                        
                            Pyary Turmeric Soap
                        
                            RDL Papaya Brightening Soap
                        
                            RoC Retinol Correxion Deep Wrinkle Targeted Patches
                        
                            Skin rocks The Gentle Acid
                        
                            T3 Ada Gel
                        
                            Teratu Beauty Bye Dirt
                        
                            The Queen Cosmetics and Skin Care Line Power Exfoliating Set- Kojic Acid Soap
                        
                            body blitz Plump It Up Serum
                        
                            ALVEUS Sapone Viso Corpo
                        
                            Acne.org Aha+ (Glycolic Acid - 10%)
                        
                            Acneclear 7 Days
                        
                            Advanced Clinicals 10% Glycolic Serum
                        
                            Aisuanis Energy Complex Ahas Exfoliating Toner
                        
                            Akmed Glycolic Cream
                        
                            Amgesic Pain Relief 1% Gel
                        
                            Aroma Zone Sérum Visage Concentré Acide Glycolique 10% & AHA
                        
                            Avoskin Naufa Pure Olive Oil Bar Soap
                        
                            Babé Laboratorios STOP AKN Keratolytic Fluid
                        
                            Barefaced Glow Peel Pads
                        
                            Base Deep Sebum Control & Pore Clarifying Serum
                        
                            Beauché Beauty Bar
                        
                            Beauty vault Premium Kojic Soap
                        
                            Bebak Pore Tightening Tonic
                        
                            Belo Intensive Whitening Bar Classic
                        
                        
                        
                        
                        
                        
                        
                        
                    
                 
                         
                                     
                         
                                     
                        