Protein is a fundamental macronutrient that plays a critical role in the growth, maintenance, and repair of tissues throughout the human body, including the hair. Hair is primarily composed of keratin, a structural protein. Adequate dietary protein is necessary for the synthesis of keratin and the overall health of hair follicles. Scientific studies have demonstrated that protein deficiency can lead to hair thinning, weakness, and even hair loss (telogen effluvium). Restoring sufficient protein intake in individuals with deficiency often leads to improvements in hair strength and density.

While there is limited evidence that protein supplementation above normal requirements further enhances hair quality in individuals without deficiency, the scientific consensus is clear that adequate protein intake is essential for healthy hair growth and maintenance. Clinical guidelines from dermatology and nutrition bodies consistently highlight the importance of protein in preventing hair disorders related to malnutrition. Thus, the use of protein to support the hair body system is scientifically validated, especially in cases where dietary intake is insufficient.