Walk into a beauty supply store and you'll see hundreds of "extension shampoos" promising to save your hair. But do they actually work? And which ones are worth your money? After 21 years, I've tested hundreds. Here's what actually works. PART ONE: What Makes a Good Extension Shampoo Characteristics of Quality Extension Shampoo: Sulfate-free (doesn't strip moisture), gentle pH-balanced formula, moisturizing (not clarifying), no heavy silicones (prevents buildup), safe for colored hair, removes buildup without damaging cuticle. Bad Extension Shampoo: Contains sulfates, clarifying formulas, heavy silicone coatings, overly fragranced, cheap fillers. PART TWO: Shampoos That Actually Work Joico K-Pak Color Therapy Shampoo: Sulfate-free, moisturizing, great for color-treated extensions, professional quality, worth it. SheaMoisture Raw Shea Butter Restorative Shampoo: Affordable, sulfate-free, moisturizing, available everywhere, good value. Biolage Advanced Repair Shampoo: Professional quality, sulfate-free, gentle formula, works on all hair types, worth it. Carol's Daughter Black Vanilla Moisture & Shine Shampoo: Sulfate-free, moisturizing, good for textured extensions, affordable, solid choice. PART THREE: Conditioners That Work Joico K-Pak Color Therapy Conditioner: Pairs with their shampoo, moisturizing, strengthens, worth it. SheaMoisture Raw Shea Butter Restorative Conditioner: Matches shampoo, affordable, very moisturizing, good value. Biolage Advanced Repair Conditioner: Professional quality, pairs with their shampoo, strengthens while moisturizing, worth it. Cantu Shea Butter Leave-In Conditioning Repair Cream: Affordable, great leave-in, lightweight, works on all textures, good value. PART FOUR: Deep Conditioning Treatments Cantu Shea Butter Deep Conditioning Mask: Affordable, deeply moisturizing, works on all types, good value. SheaMoisture Raw Shea Butter Restorative Masque: Affordable, intensely moisturizing, great for dry extensions, good value. Olaplex #3 Hair Perfector: Professional quality, repairs damage, expensive but worth it, lasts long. K18 Leave-In Molecular Repair Hair Mask: Professional quality, repairs broken bonds, expensive, worth it if budget allows. PART FIVE: Products to Avoid Avoid: Head & Shoulders (sulfates), Pantene (too heavy), cheap grocery store brands (fillers), clarifying shampoos (strip extensions), anything with silicone (builds up). PART SIX: Your Basic Routine Minimal Setup: Sulfate-free shampoo (Joico or SheaMoisture), sulfate-free conditioner (same brand), leave-in conditioner or spray, deep conditioning mask (1x weekly). That's it. You don't need expensive specialty products. BOTTOM LINE Invest in quality shampoo and conditioner. Good products are cheaper than replacing damaged extensions. You don't need a dozen products. You need good sulfate-free shampoo, conditioner, and 1x weekly deep conditioning. Do that and your extensions will thrive.