Kerasys Protein

Hair is roughly 95% keratin, a fibrous protein. Heat styling, chemical processing, bleaching, and physical friction break down the protein structure, leaving hair porous, weak, and prone to breakage. Protein-enriched shampoos and treatments deposit hydrolyzed proteins (smaller protein fragments) that temporarily fill gaps in the hair cuticle, restoring smoothness and tensile strength.

KERASYS uses protein as both a structural and a functional ingredient across its clinic lines. In the Damage Clinic line, protein reinforces weakened strands. In the Volume Clinic line, protein adds body to fine hair. In the Scalp Cooling and Dandruff Care lines, protein supports scalp health alongside cooling agents.

The Damage Clinic line is KERASYS's repair-focused tier. The Damage Clinic Protein Shampoo 980ml is formulated for chemically treated, bleached, or heat-damaged hair that has lost elasticity or feels rough. The Damage Clinic Protein Treatment 1000ml is a rinse-off mask that provides deeper conditioning than a standard conditioner, leaving hair softer and easier to detangle after each use.

The treatment should be used two to three times per week on damp hair after shampooing. Leave it on for two to three minutes before rinsing. For severely damaged hair, leaving the treatment a little longer (five to seven minutes) increases the conditioning effect within each session.

The Volume Clinic line targets fine, limp, or flat hair. The Volume Clinic Protein Shampoo 980ml and Volume Clinic Protein Conditioner 980ml are paired products that work through protein to thicken the hair shaft and reduce limpness at the roots.

Protein in volume products works differently from protein in repair products. Rather than filling damaged cuticles, it coats the hair shaft slightly to add body and reduce the static cling that makes fine hair flat. Using the conditioner on mid-lengths and ends only, avoiding the scalp, prevents the roots from getting weighed down.

The Scalp Cooling Clinic Protein Shampoo 980ml and Scalp Cooling Protein Shampoo 750ml are designed for scalps that feel hot, itchy, or overly oily. The cooling sensation comes from menthol-type agents in the formula, which reduce scalp warmth and reduce the feeling of oiliness after washing.

Protein in this line supports the scalp barrier rather than treating strand damage. These shampoos are best used daily or every other day for scalps that produce excess sebum. They are not the best choice for dry scalp conditions, where the cooling agents can be too stripping.

The Dandruff Care Deepclean Cooling Protein Shampoo comes in two sizes: 600ml and 980ml. The Scalp Dandruff Care Cooling Protein Shampoo 980ml is a closely related variant. Both target dandruff and scalp buildup with a deep-cleansing formula that also has the cooling sensation from the Scalp Cooling line.

Dandruff shampoos in Korea tend to use zinc pyrithione or climbazole as anti-dandruff agents alongside salicylic acid or menthol for exfoliation and cooling. Used two to three times per week as a dedicated dandruff treatment, or more frequently during flare-ups, these shampoos reduce visible flaking over two to four weeks of consistent use.

KERASYS Protein Cream Staining is the outlier in this collection. Unlike the clinic shampoos and treatments, it is a styling or treatment cream rather than a wash-out product. The "staining" name refers to coating the hair shaft with protein for a smoothing or glossing effect, applied to dry or slightly damp hair.

It sits separately from the Damage, Volume, and Scalp lines, functioning more like a leave-in finisher than a part of a matched shampoo-treatment pair. It is useful alongside any of the protein shampoos in the collection as a final step for frizz control or surface shine.

The decision mostly comes down to your primary hair or scalp concern. If your hair feels rough, snaps easily, or has been bleached or permed, the Damage Clinic Protein Shampoo 980ml and Damage Clinic Protein Treatment 1000ml are the most targeted pair. If your hair is fine and flat but not particularly damaged, Volume Clinic Protein Shampoo and Conditioner 980ml addresses volume without loading on repair ingredients you don't need.

If your scalp is the main problem - oiliness, heat, itching, or dandruff - the Scalp Cooling or Dandruff Care lines address those concerns with the cooling agents that the Damage and Volume lines don't include. Some users with both damaged hair and scalp issues rotate between a Damage Clinic wash day and a Scalp Cooling wash day depending on what their scalp needs that week.

Most shampoos and conditioners in this collection come in 980ml bottles. The Damage Clinic Protein Treatment is in 1000ml. The Scalp Cooling Protein Shampoo also has a 750ml option, and the Dandruff Care Deepclean 600ml is available as a smaller entry point for the dandruff line.

For daily shampoo use, a 980ml bottle typically lasts two to three months per person. Buying the shampoo and treatment or conditioner in the same line at once makes sense once you have confirmed the line matches your concern, since both products work together as a pair.