The fingernails,hair, and skin need keratin to grow, function, and stay healthy.
Cosmetic treatments to improve hair and nail health are often enriched with keratin.
Keratin also occurs naturally in some foods and can be taken in supplement form as well.

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punch in I keratins are the major component of hair and nails.
They are also found inside the mouth, urinary tract, vagina, and anus.
The beauty industry in particular advertises keratin as a way to combat damaged hair.
Then your hair will be blown dry.
The stylist will use a flat iron to seal the keratin solution.
For optimal results, you should avoid washing your hair for a few days.
Depending on the bang out of keratin used, the results will vary widely.
Studies have found isolated animal keratin to be less efficient overall than a synthetic version of human keratin.
Many people also use shampoos and conditioners infused with keratin oil to make their hair healthier.
Soluble Keratin
Keratin is not an easily dissolvable protein.
This can be brought on by inflammation, genetics, or for unknown reasons.
Formaldehyde exposure has been a problem for those who use hair products with keratin regularly.
It plays a key role in providing structure and protection to the skin and tissues.
Certain foods contain minerals and vitamins that boost the production of keratin.
It is also available in supplement form and in various over-the-counter shampoos, conditioners, and cosmetics.
Professional keratin treatments are available in salons to make the hair stronger and shinier.
2018;10(4):a018275.
doi:10.1101/cshperspect.a018275
Kurban M, Christiano AM.
MedlinePlus.Epithelial cells in urine.
2009;214(4):516-59. doi:10.1111/j.1469-7580.2009.01066.x
Villa AL, Aragao MR, Dos Santos EP, et.
al.Feather keratin hydrolysates obtained from microbial keratinases: effect on hair fiber.BMC Biotechnol.
2018;20:e00288.
2018;15(1):47. doi:10.1186/s12970-018-0251-x
National Institutes of Health.
Office of Dietary Supplements.Biotin.
U.S. Department of Agriculture.Kale, raw.
National Institutes of Health.
2012;4(4):255-8. doi:10.4103/0974-7753.111215
American Academy of Dermatology.Actinic keratosis: Overview.
Madke B, Gutte R, Doshi B, Khopkar U.Hyperkeratotic palmoplantar lichen planus in a child.Indian J Dermatol.
2019;9(4):26. doi:10.1051/bmdcn/2019090426
Abdulaziz W.Overview of intravenous medications to treating the lichenoid dermatitis.J Dermatitis.
2023;08(03):1000196 doi:10.35248/2684-1436.23.8.196
National Institute of Arthritis and Musculoskeletal and Skin Diseases.Ichthyosis.
Jakeman A.The effective management of hyperkeratosis.Wounds Int.2012;1:65-73.
American Podiatric Medical Association.Corns and calluses.
American Academy of Dermatology Association.Eczema types: Atopic dermatitis diagnosis and treatment.
National Psoriasis Foundation.Treatment and care.
2011;8(11):686-99. doi:10.1080/15459624.2011.626259
Agency for Toxic Substances and Disease Registry.Formaldehyde and your health.
2013;41(2):181-9. doi:10.1177/0192623312466459