If your hair feels ‘thin, brittle, weak,’ or prone to breakage, your diet might be missing a key ingredient: protein.

Protein treatments repair damaged hair by rebuilding broken keratin bonds. Discover 9 benefits of this revolutionary therapy ...

Brittle, ridged nails may be early signs of hidden health issues like thyroid trouble, nutrient deficiencies, and digestive ...

May leave a residue on the hair Every product in this line boasts an Alpha Keratin 60ku protein that's "identical to the keratin that makes up 90% of hair." Promising to "repave and refill keratin ...

Keratin is a type of protective protein our bodies produce naturally that appears in our hair, skin and nails, explains Madison Roulan, hairstylist and co–owner of Rule On Salon in New York City.

Keratin is a fibrous protein naturally found in our hair, skin, and nails, giving them structure and resilience. But with age or exposure to environmental pressures, our body produces less keratin ...