«Vegetable keratin» is one of the most misleading designations in the hair care market. The term implies an alternative to animal keratin, structurally equivalent but of plant origin — an image that does not withstand biochemical analysis. Understanding what «vegetable keratin» actually is, what it can and cannot do, is essential for any professional making science-based recommendations. Hairswiss clarifies.

What Is Called «Vegetable Keratin»: A Different Chemical Reality

From a strictly biochemical standpoint, keratin does not exist in the plant kingdom. Keratin is a fibrous protein exclusive to animal organisms: hair, nails, feathers, scales, hooves. What the market designates as «vegetable keratin» is in reality a group of hydrolyzed plant proteins, derived primarily from wheat (Triticum vulgare), soy (Glycine soja), corn (Zea mays), or rice (Oryza sativa), processed by acid, alkaline, or enzymatic hydrolysis to produce peptides and free amino acids of low molecular weight.

On an INCI label, this corresponds to:
Hydrolyzed Wheat Protein, Hydrolyzed Soy Protein, Hydrolyzed Corn Protein, Hydrolyzed Rice Protein — never «Hydrolyzed Plant Keratin», which is a marketing invention with no recognized INCI basis.

Amino Acid Profile: The Fundamental Difference from Animal Keratin

Human hair keratin is exceptionally rich in cysteine (10–17% of total amino acids), the sulfur-containing amino acid whose thiol groups form the disulfide bonds that guarantee the strength and cohesion of the fiber. Plant proteins show very different profiles:

• Hydrolyzed wheat protein: rich in glutamine (~35%), glutamic acid, and glycine. Cysteine content < 2%. Excellent surface conditioning and film-forming agent, but without the capacity to reconstitute disulfide bonds in the cortex.
• Hydrolyzed soy protein: balanced essential amino acid profile, slightly higher in cysteine (~1.3%) than wheat, with good moisturizing properties. Its variable molecular weight depending on hydrolysis determines its penetration level into the fiber.
• Hydrolyzed rice protein: composed mainly of glutelins and prolamins. Its low molecular weight peptides show good substantivity on the cuticle and a perceptible smoothing effect.

Conclusion: these proteins do not reconstruct hair keratin in the structural sense. They act as surface conditioning agents and protein humectants, depositing a peptide film on and in the cuticle that improves hold, smoothness, and friction resistance, without deep cortical reconstruction.

What Vegetable Keratin Actually Does: Concrete Benefits

• Improved tensile strength: standardized tests show increased breakage resistance of hair fibers treated with hydrolyzed wheat proteins, particularly on porous or bleached fibers.
• Porosity reduction: the peptide deposit partially fills lacunar zones in the cuticle, reducing excessive water absorption (hygral fatigue) and limiting humidity-induced fiber swelling.
• Antistatic effect: positively charged peptides (after cationization) neutralize electrostatic charges on the hair surface, reducing electrostatic frizz.
• Vegan compatibility: for salons and clients refusing ingredients of animal origin, hydrolyzed plant proteins are the only ethically acceptable alternative to animal keratin treatments.

Professional Plant Protein Products Available on cliCHair

Among the professional formulations that integrate hydrolyzed plant proteins in technically sound protocols, several references stand out on cliCHair.ch:

INEJ Remedy Shampoo — CODE ZERO

The INEJ Remedy Shampoo by CODE ZERO is formulated with hydrolyzed macadamia protein and silk protein, two protein sources with a high amino acid profile compatible with hair keratin. Its preparatory action removes impurities while depositing a first protein charge on the fiber, optimizing receptivity to subsequent treatments.

→ INEJ Remedy Shampoo on cliCHair.ch

Inside Potion — CODE ZERO

The Inside Potion is a concentrated reconstruction active designed to be added to coloring or bleaching formulations to limit protein degradation during technical processes. Its formula combines hydrolyzed macadamia proteins with free amino acids that penetrate the cortex during the process application, reducing material loss and preserving fiber elasticity.

→ Inside Potion on cliCHair.ch

Reconstructive Treatment — Edelstein

The Reconstructive Treatment by Edelstein integrates a mixed matrix of hydrolyzed keratin (animal) and plant proteins, combining the deep cortical reconstruction of animal keratin with the surface conditioning effect of plant peptides. This hybrid positioning represents the most complete formulatory approach for severely degraded hair.

→ Reconstructive Mask by Edelstein on cliCHair.ch

How to Read a Label: Protein Quality Indicators

To assess the potential efficacy of a plant protein formulation, three INCI parameters are decisive: (1) the protein source — soy and silk offer the amino acid profiles closest to hair keratin; (2) the average molecular weight of the peptides — lower = better cortical penetration; (3) the position in the INCI list — an ingredient listed after preservatives (< 1% concentration) will have a negligible effect, regardless of its marketing designation.

Hairswiss encourages professionals to read labels rigorously and to distinguish marketing claims from biochemical realities. Mastering ingredient chemistry is the prerequisite for truly competent client advice.