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A waxy solid material that helps oil and water to mix together, aka emulsifier. It is super similar to Steareth-20 with just a little more ethoxylation and thus a little more water solubility. It works very well when combined with mostly oil-soluble emulsifiers such as Steareth-2 and the two together can form exceptionally stable emulsions. 

Products with Steareth-21

AOA Studio Paw Paw: Liquid Concealer Light Tones AOA Studio Paw Paw: Prowear Foundation - Light Tones Dermafix Vitaplex-C Cream Kaya Intense Hydration Body Lotion Lamel Professional Sunwave Foundation Derma Essentia Foot Cream Mamaearth No More Tangles Conditioner Summecosmetics S+ Cell Activator- Nourishing Anti Age Serum Valuge Vansame Plus Emulsión Corporal Barbara Bort Equilibrium Cleansing Milk Bionike Defence B-Lucent Skin-Evening Concentrate Bionike Defence Hydra 5 Booster Elemis Tan Accelerator Eucerin 48H Anti-Transpirant Roll-On Good virtues co. Brightening Night Cream Institut Esthederm Instant Repulp Mask Talent India Melasure Gel Apoteket Ren Hud Ansiktsskrubb Avant 8 Hour Radiance Renewal Sleeping Mask Bionike Defence Xage Concentrated Serum Bless Skin Moisturizer For Sensitive Skin Boots No7 Lift And Luminate triple action Night Cream Boots No7 No7 Pure Retinol Night Repair Cream Clean & Clear Blackhead Eraser Face Scrub Clean & Clear Oil-Free Deep Action Cream Facial Cleanser DERMAFIQUE Night Replenish Body Serum, Body Lotion For All Skin Types, Dr. Sheth Basic Brightening Vitamin Glotion Fresh Umbrian Clay Oil-Free Lotion Gold Bond Cracked Skin Relief Hand And Body Lotion Hidrofugal Deo Roll On Antitranspirant Classic Lacura by Aldi Moisturising Hand Cream With Oatmeal & Glycerin Myra Smmooth Glow Whitening Facial Moisturizer NATURELLE Maxkin AHA Face Treatment Cream NIVEA MEN Deep Impact Roll On NIVEA MEN Dry Impact Anti-perspirant Deodorant Neutrogena Visibly Clear Pink Grapefruit Cream Wash Nivea Pearl & Beauty Anti-perspirant Roll On No7 Lift & Luminate Night Cream No7 Radiant Results Nourishing Cleansing Lotion Oriflame Activelle Extreme Oriflame Activelle Fresh Anti-Perspirant Deodorant PEAU GUERIE Crema Nocturna Con Acido Glicolico Patricks S2 Satin Finish | Medium Hold Styling Product Pharmaceris Sebo-Almond Peel 5% Siluma Aha Renewing Cream e.l.f. Daily Face Hydrator gatineau Age Benefit Integral Regenerating Eye Cream ACM Sebionex K Crème Alterna Caviar Anti-Aging Restructuring Bond Repair Leave-In Treatment Mousse American Crew Forming Cream