Is it possible to prevent hair loss with just shampoo or scalp care?

My hair loss has increased lately, so I am using a hair loss management shampoo.
I am looking into whether scalp care shops are also effective.
However, I'm not sure if hair loss can be prevented with just shampoo or care.
I am also curious if there are actually cases where it can be maintained with home care alone.
I would also like to know if it is effective when combined with hospital treatment.
I would appreciate advice from those with experience in initial management.
Please recommend some hair loss management methods.