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

Slower-than-normal nail growth, brittle edges or unusual ridges may indicate more than cosmetic concerns. These changes might ...

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

Known for its cult-favorite skincare solutions and minimalist, high-performance formulas, global derma k-beauty brand COSRX ...

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.