Compare
Hydrate Shampoo or K18? Choose the step you need
One is a moisturizing cleanser; the other is a leave-in treatment. Compare their intended roles before adding either to your routine.
Beauty Journal
Reading before buying
Choose a product with a purpose. Start with a shampoo-versus-treatment comparison, follow the K18 routine, or find a gentler way through tangles.
How we write
We compare the roles of products in our store and summarize their manufacturers' directions. General hair-care guidance is attributed to the American Academy of Dermatology. These are buying guides, not personal product tests or a stylist's review. Sources were checked on September 20, 2026.
Directions
How to use K18: dose, timing and the next step
A compact guide to K18's leave-in mask: the dose for your bottle, the four-minute pause, initial use and optional leave-in conditioner.
Routine
Detangling: when to comb and where a leave-in fits
Hair texture affects when to detangle. Separate general combing guidance from the application instructions for UNITE 7SECONDS Detangler.