The cortex makes up the bulk of the hair shaft and is primarily made of protein. Inside the cortex, we have disulfide bonds that hold the protein together, which makes the hair strong and resilient.

protein-based treatments are a great place to start. For damaged hair, proteins in products help to strengthen the bonds in our hair strands and in turn make our hair feel stronger and able to ...

The key to maintaining a balance between moisture vs protein is the secret for achieving strong, soft and shiny hair. Check out our guide.

Keratin is a superhero protein vital for your hair, nails and skin. Its strong bonds provide hair with strength and ...

Keratherapy offers both short-term and long-lasting products and professional treatments to restore the keratin content of ...

When it comes to hair loss, there are as many myths about it as there are treatments for it. An expert broke down common ...

moisture balanced with protein,” says celebrity stylist Gregory Patterson. Unlike Olaplex (and K18), which targets the covalent bonds of your hair, Bondbar penetrates hydrogen and ionic bonds.