Protein is an essential nutrient for hair and nail growth, as they are made up of a protein called keratin. Therefore, consuming adequate protein through the diet or supplements like protein powder may promote hair and nail growth.
One study found that women who consumed a higher protein diet had improved hair volume and thickness, as well as decreased hair shedding compared to those who consumed a lower protein diet. Additionally, there was a correlation between protein intake and nail strength and thickness in these women (1).
Another study found that a protein supplement containing hydrolyzed collagen, which is a protein found in skin, hair, and nails, improved skin elasticity and hydration in middle-aged women after 8 weeks of supplementation (2).
However, it is important to note that hair and nail growth also depends on other factors such as genetics, age, and overall health. Therefore, while protein powder may contribute to hair and nail health, it may not be the only determining factor.
- Guo EL, Katta R. Diet and hair loss: effects of nutrient deficiency and supplement use. Dermatol Pract Concept. 2017;7(1):1-10.
- Proksch E, Segger D, Degwert J, et al. Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study. Skin Pharmacol Physiol. 2014;27(1):47-55.