People who have seen the effects of hair loss shampoo

My husband is under a lot of stress from work, so suddenly he's losing a lot of hair. After shampooing, the drain is full of short hair. This must be the beginning of hair loss.

Does using anti-hair loss shampoo really reduce hair fall?

Please let me know if anyone has experienced effects.

I would appreciate it if you could recommend a shampoo for hair loss management.