Which will show a better effect, the medicine or the product?

I'm not taking hair loss medication, but I'm using shampoos and nutritional supplements that are said to be good for hair loss.
I'm not sure which one is better.
I suppose the more the merrier, but I found myself half-doubting every single one of them.
You know, some people say it was effective, while others say it wasn't.
How do you manage your hair loss?