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Sodium Hydroxide

Also-called-like-this: lye
What-it-does: buffering

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

Acne.org Aha+ (Glycolic Acid - 10%) Bioderma Sebium Serum Glossier Solution L’anza Healing Color Care Color-Preserving Trauma Treatment Paula's Choice Skin Perfecting 8% Aha Gel Exfoliant Benefit Cosmetics Benetint Cordes Bpo 5% Gel FÜNFSINNE Multi Tonic 6% Aha Gesichtswasser Und Peeling Kate Somerville Liquid Exfolikate LVLY by Paola Maria Skin Toner Modern Skyn Alchemy Daily Resurfacing Exfoliant Moon Juice Beauty Shroom Exfoliating Acid Potion RAU Aha Tonic The Ordinary Aha 30% + Bha 2% Peeling Solution Alcina Skin Manager Aha Bioderma White Objective Moussant Derma E Essentials Radiance Toner Drunk Elephant T.L.C. Framboos™ Glycolic Night Serum Drunk Elephant T.L.C. Sukari Babyfacial Garnier Natural Rose Water Toner Sensitive Skin Jaina Face A.C Acne Control Treatment Serum La Roche-Posay Micellar Water Gel Neutrogena Liquid Neutrogena - The Transparent Facial Cleanser Nip+Fab Glycolic Fix Daily Cleansing Pads Nip+Fab Glycolic Fix Liquid Glow 6% Cleansing Lotion OLEHENRIKSEN Glow2Oh Dark Spot Toner Tula Pro-Glycolic 10% Ph Resurfacing Gel Bleu & Marine Conductive Gel Bravura London Lactic Acid 10% Peel 30Ml COSRX Aha 7 Whitehead Power Liquid Dermosil Exfoliating Night Serum First Aid Beauty Skin Lab Resurfacing Liquid 10% Aha Indeed Labs Hydraluron Serum Institut Esthederm Intensive Aha Peel Gentle Serum La Roche-Posay Toleriane Dermo-Cleanser La Roche-Posay Toleriane Dermo-Nettoyant Nip+Fab Glycolic Fix Serum Pixi Glow Tonic Sebamed Clear Face Antibacterial Cleansing Foam Superdrug Natural Radiant 5% Glycolic Toner The Ordinary Lactic Acid 10% + Ha skyn ICELAND Hydro Cool Firming Eye Gel Acure Incredibly Clear Cleansing Stick Caudalie Vinoperfect Concentrated Brightening Essence CeraVe Healing Ointment CeraVe Makeup Removing Cleansing Cloths Chantecaille Hibiscus Smoothing Mask Clean And Clear Persa-Gel 5 Differin Daily Deep Facial Cleanser Dr. Levy Switzerland 3 Deep Cell Renewal Micro-Resurfacing Cleanser