Hair loss shampoo

As people age, many of them probably become concerned about losing their hair.

I'm the same. I don't know why circular bald spots form in the middle of the crown, but I didn't know much about it. Others said it looked completely bald, and when I checked, the middle was really bald.

They say to choose the right shampoo because of hair thinning, is there a shampoo that helps prevent hair loss?