Please recommend a hair loss shampoo~

My college daughter used to have so much hair in elementary school that it was hard to tie it up, but now, maybe due to academic stress or because she often doesn't dry her hair after washing before sleeping, she's losing a lot of hair.

While cleaning, I find hair all over the floor in every direction.

It seems that the amount of hair has now been reduced to about one-third.

Has anyone experienced positive results with hair loss shampoo?

Please recommend a shampoo.