Keratin

Keratin is the structural protein that forms the cortex of each hair strand. In topical formulas, hydrolysed keratin molecules attach to gaps in damaged cuticles, temporarily filling voids and reinforcing the fibre from the outside in.

What it actually does

Hair is approximately 95% keratin by weight. When the cuticle layer is compromised by heat, chemical treatments, or mechanical stress, the cortex loses protein mass and the strand weakens. Hydrolysed keratin, broken into smaller peptide chains through enzymatic or acid treatment, can penetrate the lifted cuticle scales and adsorb onto the cortex surface. These peptides bond electrostatically to the negatively charged sites left behind by damage, creating a temporary scaffold that increases tensile strength and reduces breakage during combing.

Keratin also smooths the cuticle itself. By filling the inter-cuticle spaces and laying down a thin protein film, the surface becomes more uniform. Light reflects more evenly, which we perceive as shine. The strand diameter appears slightly fuller because the gaps have been patched, though no new hair growth occurs. The effect is cosmetic and reversible, lasting until the next wash cycle removes the deposited protein.

The OVESSI point of view

We approach keratin through the lens of Korean layered care, where protein treatments are dosed in gentle, repeated applications rather than one aggressive intervention. A thin rinse-off mask twice weekly delivers more sustained benefit than a monthly intensive, because the cuticle can only hold so much protein before it stiffens. Our formulas pair hydrolysed keratin with humectants and light oils, so the strand gains strength without losing pliability. This follows the Japanese principle of balance: fortify, yes, but keep the hair soft enough to move. We also consider keratin's role across multiple steps. A leave-in spray deposits a maintenance layer between washes, while a shampoo primes the cuticle for deeper penetration in the mask. This is architecture, not accident. Each product holds its place in the ritual, and the cumulative effect is quiet resilience rather than overnight transformation.

What to expect, and when

Day zero: the strand feels slightly smoother to the touch immediately after rinsing, because surface gaps have been filled. Day three to seven: reduced snapping during detangling becomes noticeable. A comb glides through with less resistance, and fewer short broken hairs appear on the bathroom counter. Week two: the cuticle lies flatter under consistent use, so shine improves in natural light. The hair does not become thicker or grow faster. What changes is the integrity of the existing length. Week four: if you have been layering keratin across shampoo, mask, and leave-in, the cumulative protein deposit creates a measurable increase in tensile strength when tested under tension. The effect plateaus here. More keratin does not mean more strength. If you stop using it, the benefit fades over the next wash cycle as the deposited protein is gradually removed. This is maintenance work, not permanent repair.

How to layer it in your ritual

Keratin belongs in the treatment phase, after cleansing and before sealing. Begin with a keratin-infused shampoo to prime the cuticle: the alkalinity of washing opens the scales slightly, allowing better penetration. Follow immediately with a mask on damp, towel-pressed lengths. Leave it for three to five minutes. The strand is swollen with water, which helps peptides migrate into the cortex. Rinse with cool water to encourage the cuticle to close over the deposited protein. On non-wash days, apply a keratin leave-in spray to damp or dry hair as a maintenance layer. Morning or night makes no difference. For fine hair, use the mask once weekly to avoid stiffness. For coarse or chemically treated hair, twice weekly is appropriate. If your hair feels brittle or straw-like, you have overdosed. Pull back to once every ten days and introduce a humectant serum between keratin treatments.

Where it lives on our shelf

Keratin anchors our strength and lift ritual across four products. The Volume : Keratin Lift Shampoo opens the cuticle gently and deposits an initial protein layer during cleansing. The Rescue : Keratin Intensive Hair Mask follows with a concentrated dose, designed for three-minute contact on compromised lengths. Between washes, The Spritz : Keratin Shine Leave-In Spray maintains the protein scaffold without weight. For a complete reset, begin the ritual with The Awaken : Rosemary & Mint Scalp Reset Scrub, which clears buildup so keratin can penetrate cleanly. Each formula is dosed to layer without stiffness.

Common questions

Can keratin repair split ends? No, a split end is a permanent break in the cortex, but keratin can temporarily seal the cuticle around the split to prevent it from travelling upward.

Will my hair become dependent on keratin treatments? No, hair does not adapt or weaken in response to external protein, but if you stop using it the temporary reinforcement will wash away.

How do I know if I am using too much? Hair will feel stiff, straw-like, or brittle to the touch, and may snap more easily during styling despite the protein deposit.