You generally use K18 more often at the start, then taper to a “maintenance” routine, adjusting based on how damaged your hair is.

Quick Scoop

  • Official guidance: Use K18 after every wash for the first 4–6 washes, then switch to using it every 3–4 washes as needed.
  • Safe maximum: It is considered safe to use after every wash on freshly shampooed, towel‑dried hair, as it is a progressive treatment, but more is not always better if your hair doesn’t need it.
  • Real‑world use: Many people end up using it about once a week or every 10–14 days for maintenance once their hair feels stronger.

How Often To Use K18

For most people:

  • Start phase:
    • Use K18 every wash for the first 4–6 washes (on clean, towel‑dried hair, no conditioner before it).
  • Maintenance phase:
    • Then use it every 3–4 washes, which usually works out to about once a week or once every other week depending on how often you shampoo.
  • Very damaged or over‑processed hair:
    • If hair is extremely compromised (heavy bleach, frequent coloring, relaxers), the brand suggests you can restart that 4–6‑wash “intensive” cycle when needed.

Adjusting For Your Hair & Budget

Because K18 is expensive, a lot of users stretch it out without losing results:

  • Some people with moderate damage use it every 10–14 days once they’re out of the initial phase.
  • Those with weekly wash routines and improved hair health often drop to about once a month for maintenance.
  • A pea‑sized amount (often 1–2 pumps depending on hair length/thickness) is usually enough; over‑applying can weigh hair down or feel greasy and just wastes product.

Simple Routine Example

  1. Shampoo (clarifying if you use lots of heavy products or styling buildup).
  2. Towel‑dry thoroughly so hair is damp, not dripping.
  3. Apply a small amount of K18 mid‑lengths to ends (and damaged areas), comb through, and leave in 4 minutes.
  4. After 4 minutes, you can add a light leave‑in or oil if desired, but do not rinse K18 out.

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