Is it safe for color treated hair?

Yes, absolutely, I have used a bit of it every time I wash my highlighted/colored hair. I shampoo with it first, then I second shampoo with my Nioxin for thinning hair. Have been doing this for years. It doesn't harm any color.

can it be used on children?

I found this caution for children under 12: https://www.webmd.com/drugs/2/drug-6925/neutrogena-t-sal-topical/details/list-precautions

What are all the ingredients?

Ingredients Inactive Ingredients Inactive Ingredients: Water Sodium C14-16 Olefin Sulfonate Cocamidopropyl Betaine Sodium Chloride Polyquaternium-22 Sodium Citrate Hexylene Glycol Sodium Lauroyl Sarcosinate Linoleamidopropyl Pg-Dimonium Chloride Phosphate Sodium Hydroxide Citric Acid Ingredients Active Ingredient Salicylic Acid 3% Purposes Anti-Dandruff, Anti-Seborrheic Dermatitis, Anti-Psoriasis Inactive Ingredients Water, Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Sodium Chloride, Polyquaternium-22, Sodium Citrate, Hexylene Glycol, Sodium Lauroyl Sarcosinate, Linoleamidopropyl PG-Dimonium Chloride Phosphate, Sodium Hydroxide, Citric Acid

Is this product sulfate-free?

Ingredients Active IngredientSalicylic Acid 3% (anti-dandruff, anti-seborrheic dermatitis, anti-psoriasis)Inactive IngredientsWater, sodium C14-16 olefin sulfonate, cocamidopropyl betaine, polyquaternium-22, sodium citrate, sodium lauroyl sarcosinate, hexylene glycol, linoleamidopropyl PG-dimonium chloride phosphate Product description Treat scalp build-up with Neutrogena T/Sal Therapeutic Shampoo Scalp Build-Up Control. After just one use, this dermatologist-recommended scalp treatment begins to clear crusty scalp build-up, while relieving itching and flaking associated with severe scalp conditions like scalp psoriasis or seborrheic dermatitis and even helps control the symptoms of common dandruff. This effective formula of this dandruff control shampoo contains 3% salicylic acid, a clinically proven active ingredient and continues to work for hours even after shampoo is rinsed off. Free of added color, preservatives, and fragrance, the conditioning formula of this scalp shampoo provides maximum relief for dry, itchy, flaky scalps.