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Personal Care formulations comprising KeraBio K31 Disclosed by Croda Europe Ltd. Key Words KeraBio K31, Hydrolysed Protein, Keratin, Strength, Repair, Vegan, Personal Care, Cosmetics, Hair Care, Executive Summary Croda has recently launched KeraBio K31, a hydrolysed non-animal derived keratin 31 protein, developed by Croda under its proprietary technology platform. Uses of this new ingredient in personal care formulations, particularly hair care formulations, are disclosed herein. Background This research disclosure is a formalised republication and expansion on literature already made available by Croda relating to KeraBio K31. The expansion takes the form of exemplary personal care formulations incorporating this ingredient as described in detail in this document. KeraBio K31 may be used, inter alia, as a hair strengthening agent, damage protection agent, restructuring agent, moisturiser, fibre elasticity improver, active or effect booster, and/or bond forming agent. Personal care formulations which comprise KeraBio K31 may include, inter alia, formulations for body care, contour care, skin care, scalp care, hair care, face care, lip care, eyelash care, fingernail care, toenail care, cleansers, hair conditioners, hair masks and treatments, hair colourants including bleaches, chemical hair straighteners, shampoos, shaving / hair removal, hair styling formats, hair protectants, e.g. from heat, chemical damage or UV, lip colouring, eye colouring, face colouring, sun protection, antiperspirants & deodorants. The personal care formulations in this research disclosure exemplify some uses of KeraBio K31 , but in no way constitutes an exhaustive or exclusive list of formulations or ingredients in or with which it may be used.  KeraBio™ K31 Biomimetic molecular repair Biomimetic bond-builder with pure, potent performance. Keratin-recharge at the molecular level, elevating hair strength beyond repair. INCI name Preservative system % Active Recommended use level Appearance Average molecular weight (Da) TBC Benzyl alcohol 5% Up to 0.5% active Yellow amber liquid ~900 Features Biotechnology production process 99% naturally derived (ISO 16128) Vegan* suitable Phenoxyethanol-free EU/UK REACh compliant Benefits Bonds to hair keratin within the cortex (peptide binding assay, fluorescence microscopy) Delivers 100% stronger hair than the leading commercial bond builder (cyclic fatigue) The more you use it the better it gets (cyclic fatigue, multi-application data) Reset to virgin hair (DSC data, bleached/treated hair vs virgin control) Formats Suitable for all formats (versatile chemistry means it can be formulated into a wide range of formulation types). Hair types Damaged to overprocessed hair (bleached, coloured hair, heat damaged). Fragile hair types (aged hair, textured hair) SKUs Damaged hair, coloured hair, textured hair, ageing hair Recommended ingredient combinations: FibraShield™ C for protection and KeraBio K31 for repair are a powerful duo for damaged hair. *can be considered to be generally suitable for vegan; however, as there is no single agreed definition nor a standard, global certification, if you are interested in making a vegan claim, please request our Vegan Suitability statement for specifics on this product, and compare to the certification(s) you are seeking to meet. The bond builder market: a high-growth opportunity The bond builder category is expanding rapidly as consumers seek stronger, healthier hair amid frequent colour transformations, chemical treatments, and heat styling. While many products claim to strengthen and protect, true bond builders remain rare. Now, Croda Beauty is redefining the landscape by introducing the first ingredient supplier’s bond-building solution—offering brands a cutting-edge, science-backed approach to hair repair. Biotechnology designed and produced Over a decade of advanced proteomics research has deepened our understanding of hair at the molecular level, allowing us to push the boundaries of hair repair science. Using synthetic biology, we have engineered a keratin protein previously unattainable with conventional technology. Unlike traditional proteins derived from animal or plant sources, KeraBio K31 is biomimetic, designed to work in harmony with the hair’s natural biology. Its human hair-identical structure preserves key active sites within the peptide sequence, ensuring elevated potency and unrivalled repair performance. Biotechnology production process Overview Inspired by nature, our biotechnology process leverages advanced digital tools to design proteins with targeted functions. Guided by biological insights and powerful bioinformatics, we engineer microbial cell factories to prod...