Hair loss prevention

Hair loss is difficult to reverse once it occurs, so prevention is considered the best approach.

I'm not experiencing hair loss, but lately, after washing my hair, I've been shedding more than before, and I think my hair has become a bit thinner.

I think it would be best to prevent it early, but do over-the-counter hair loss shampoos or things like brewer's yeast work? Do you have any lifestyle habits you follow to prevent hair loss?