What hair treatment helps to repair damaged hair by adding moisture and nutrients?

A deep conditioning treatment is specifically designed to penetrate the hair shaft and infuse moisture and nutrients into the hair. This treatment is especially beneficial for damaged hair, which often lacks the hydration and essential nutrients needed for optimal health. The deep conditioning process typically uses rich oils, proteins, and vitamins to restore moisture balance and improve the overall texture and resilience of the hair.

In contrast, a protein treatment focuses on strengthening the hair by replenishing protein levels, which can help reduce breakage but may not provide the moisture that dry or damaged hair needs. Coloring treatments primarily involve chemical processes that alter the hair's color, which can further dehydrate hair if not followed by proper conditioning. Curling treatments can also stress the hair's structure, making them less beneficial for repair. Thus, the deep conditioning treatment stands out as the best option for repairing damage by adding needed moisture and nutrients to the hair.