Kerasys Damage

Damage Clinic is aimed at hair that has undergone structural changes from chemical processes. The primary candidates are bleached hair, which loses protein and lipid content through oxidative processes; color-treated hair, especially hair that has been colored multiple times; permanently waved or straightened hair; and hair weakened by prolonged heat styling without heat protection. Healthy hair typically does not need the concentrated repair focus of this line, though it can be used without harm. The difference is visible most clearly on hair that has become porous, dull, brittle, or prone to breakage.

The Damage Clinic Shampoo is available in four sizes: 600ml, 750ml, 980ml, and 1000ml. The 600ml is a practical midpoint size, lasting roughly one to two months of daily use for one person. The 750ml and 980ml sizes are volume steps suited for households with multiple users or higher-frequency washing. The 1000ml is the largest standard size, providing maximum value per ml for everyday use. For truly high-volume users, the Extra Damage Shampoo 2kg is a professional or multi-user format that covers four to six months of daily use. The 2kg size is significant value for salons, households with multiple users, or people who wash their hair daily and prefer fewer reorders.

Two conditioner formats are available: the Damage Clinic Conditioner in 980ml and 1000ml, and the Damage Clinic Rinse in 600ml. The Conditioner is the main moisturizing and repair treatment applied after shampooing, left on for two to three minutes, then rinsed. The 980ml and 1000ml are equivalent in practical terms; both are full-size bottles for sustained daily use. The Rinse (600ml) is a lighter conditioner format used for everyday conditioning without the heavier protein or treatment load of the main Conditioner. A common approach is to use the Rinse on lighter wash days and the Conditioner when hair needs more attention. The Extra Damage Rinse 4000ml is the professional-scale equivalent, a large-format rinse for salons or high-volume home use over several months.

The Damage Clinic Treatment (300ml) is the most concentrated product in the line. Unlike the conditioner used after every wash, the Treatment is applied one to two times per week as a deeper repair step: applied to clean hair, left on for five to fifteen minutes (longer with heat), then rinsed. The 300ml size is appropriate for this weekly use pattern, lasting four to eight weeks at one to two treatments per week. The Treatment targets protein reinforcement and moisture-sealing in the hair shaft more aggressively than the Conditioner, and is the most impactful product in the line for visibly bleached or broken hair. It pairs with the Conditioner for a two-step conditioning approach: light conditioning every wash, deep treatment once or twice weekly.

The Extra Damage formats are where the KERASYS Damage Clinic line distinguishes itself from most retail hair care brands. The 2kg shampoo and 4000ml rinse are sold in bulk formats typically used in Korean salons for backbar application. For home buyers, these sizes are practical for large families, people who share a bathroom with multiple daily users, or people who are committed to the formula and want to buy less frequently. The 4000ml rinse is one of the largest single hair care SKUs available outside professional supply channels, and its presence in the skinsli lineup is unusual for an international retail store. At the standard daily-use rate of one shampoo wash per day, the 2kg shampoo covers approximately three to four months for one person.

A practical Damage Clinic home routine runs as follows. Daily wash: Damage Clinic Shampoo (any size), followed by Damage Clinic Conditioner or Rinse depending on hair density and how much conditioning is needed that day. Weekly treatment day (one or two per week): Damage Clinic Shampoo, then Damage Clinic Treatment instead of the Conditioner, left on five to fifteen minutes with heat if possible before rinsing. This routine maintains surface conditioning every day and performs structural repair on designated treatment days. For hair in severe distress (heavily bleached or chemically processed multiple times), the Treatment can be used after every wash during an initial recovery period before transitioning to once-weekly use.

The distinction between conditioner and treatment use is primarily about frequency and exposure time. The Damage Clinic Conditioner is formulated for every-wash use: lightweight enough for daily conditioning without buildup or heaviness. The Treatment is a higher-concentration formula not designed for daily use, as over-application can cause protein overload, which makes hair feel stiff and brittle rather than soft. Use the Treatment on dedicated repair days and the Conditioner the rest of the time. If your hair feels stiff and heavy after switching to the Treatment daily, reduce frequency to once per week and rely on the Conditioner for daily use.

The size choice in the Damage Clinic line depends on how many people use the product and how often. For one person washing daily: 980ml or 1000ml shampoo and conditioner. For two people washing daily: 1000ml sizes may last only six to eight weeks; the Extra Damage 2kg shampoo and 4000ml rinse become more economical at this volume. For occasional use (two to three times per week, one person): 600ml or 750ml covers two to three months per bottle. For salons or professional settings: Extra Damage formats are the practical choice. The Treatment at 300ml is appropriate for all user types at the once-to-twice-weekly frequency it is designed for.