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health.howstuffworks.com/skin-care/nail-care/health/fingernails1.htm

In order to understand both how to keep your nails healthy and how they can act as an indicator of health problems, first you have to know that fingernails are made of layers of a protein called keratin. This protein is also found in your skin and hair [source: Mayo Clinic]. Changes and ...

en.wikipedia.org/wiki/Nail_(anatomy)

A nail is a horn-like keratinous envelope covering the tips of the fingers and toes in most primates.Nails evolved from claws found in other animals. Fingernails and toenails are made of a tough protective protein called alpha-keratin which is found in the hooves, hair, claws and horns of vertebrates.

www.healthline.com/health/beauty-skin-care/what-are-nails-made-of

1. Your nails are made of keratin. Keratin is a type of protein that forms the cells that make up the tissue in nails and other parts of your body.. Keratin plays an important role in nail health ...

askdruniverse.wsu.edu/2016/01/04/what-are-fingernails-made-of

Dear Amy, My claws can come in quite handy when I need to scratch my ears or climb trees. I bet you’ve found that your own fingernails can be useful tools, too. Perhaps you’ve used them to pick up a penny or peel an orange. It turns out that while my claws and your fingernails look a little different, they are actually made out of the same thing: keratin.

www.webmd.com/beauty/features/artificial-nails-acrylics-gels-silks

Some wraps are made of silk, but others are made of linen, paper, or fiberglass. Your nail technician will fit the material to your nail's shape, hold it in place, then brush on glue.

animalsmart.org/kids-zone/jr-animal-scientist-e-news/what-are-fingernails-made-of-

What are fingernails made of? Humans have hard nails on their fingers and toes. Nails are very useful. They protect the ends of your fingers and help you scratch itches. But what are nails made of? Nails are made of keratin. Keratin is a protein produced naturally in your body. Your hair is also made of keratin.

www.onhealth.com/content/1/fingernails_-_what__are_they

Fingernails grow from the matrix. The nails are composed largely of keratin, a hardened protein (that is also in skin and hair). As new cells grow in the matrix, the older cells are pushed out, compacted and take on the familiar flattened, hardened form of the fingernail.

www.mayoclinic.org/healthy-lifestyle/adult-health/in-depth/nails/art-20044954

To keep your fingernails looking their best: Keep fingernails dry and clean. This prevents bacteria from growing under your fingernails. Repeated or prolonged contact with water can contribute to split fingernails. Wear cotton-lined rubber gloves when washing dishes, cleaning or using harsh chemicals. Practice good nail hygiene.

www.mayoclinic.org/healthy-lifestyle/adult-health/multimedia/nails/sls-20076131

Did you know that your fingernails can provide clues to your overall health? For example, ice pick-like depressions in the nails (nail pitting) are common in people who have psoriasis — a condition characterized by scaly patches on the skin. Nail pitting can also be related to connective tissue disorders, such as Reiter's syndrome, and ...

www.healthline.com/health/split-nail

Your fingernails and toenails are made out of layers of keratin which is also the protein that hair is made out of. Your nail protects the nail bed. The nail growth comes from below the cuticle area.