Just like the skin, the hair undergoes age-related changes over time, with dryness, dullness, greying and hair loss ...

An endocrinologist and a dermatologist share why hair texture changes, and what—if anything—you can do about it.

Just a few products contain it, and products aimed at women? Even fewer ... it is a commitment to keep up the hair growth/halting hair loss. How long before you will see a difference?