No, nails are not made of calcium.
The True Composition of Nails
While calcium is a vital mineral for many bodily functions, particularly bone health, it is not the primary component of human nails. According to Holland & Barrett, nails are made from keratin. Keratin is a type of protein, specifically a fibrous structural protein that forms the main constituent of hair, skin, and nails.
Distinguishing Nails from Bones
It's a common misconception that nails, like bones, derive their hardness from calcium. However, their structural compositions are quite different.
| Body Part | Primary Composition | Key Components |
|---|---|---|
| Nails | Keratin | Hardened protein |
| Bones | Collagen, Calcium Phosphate | Protein, minerals (including calcium) |
As the reference clarifies, bones are made up of collagen and calcium phosphate. This calcium phosphate is indeed what gives bones their strength and rigidity. Nails, on the other hand, achieve their durability through the dense packing and hardening of keratin protein.
What is Keratin?
Keratin is a highly durable and protective protein. Its unique structure allows it to form tough, insoluble fibers, making it ideal for the protective coverings of the body.
- Strength and Protection: The keratin in nails provides a protective barrier for the fingertips and toes, shielding them from physical damage.
- Growth: New nail cells, primarily made of keratin, are continually produced at the nail matrix (the base of the nail), pushing older, dead cells forward to form the visible nail plate.
- Similar to Hair and Skin: Keratin is also the main structural component of hair and the outermost layer of the skin, highlighting its importance across various integumentary structures.
(Source: Holland & Barrett)
