4 citations
,
October 2024 in “Journal of Cosmetic Dermatology” This study found that taking oral FKH supplements for 90 days improved facial skin, hair, and nail appearance, and highlighted the role of free L-amino acids as potentially beneficial beyond their protein-building functions.
January 2026 in “Health Food & Biotechnology” This study developed a sustainable biotechnological process using Bacillus licheniformis strains to produce keratin hydrolysate from chicken feathers, and found that cosmetic hair serum with this ingredient improved hair smoothness, elasticity, and shine in a small focus group.
December 2021 in “Trichology and cosmetology:” This study demonstrated that a daily oral supplement of 1000 mg Kera-Diet® improved hair and nail conditions in women experiencing acute telogen effluvium and brittle nail syndrome over three months.
January 2019 in “Journal of cosmetology & trichology” In this study, researchers found that supplementation with L-cystine, either alone or with a keratin hydrolysate, significantly improved hair density, hair and nail brightness, and nail growth in women experiencing acute telogen effluvium and brittle nail syndrome over three months.
This study developed O/W hair mask emulsions with collagen hydrolysate, keratin, and natural oils, reporting that they are stable, physiologically acceptable for skin, creamy, non-greasy, and hydrophilic, with properties suitable for cosmetic applications in hair care.
