Can using treatment cause hair loss?

I always make sure to use hair treatment every time I wash my hair, but I'm worried because it feels like I'm losing more hair lately 😥

I'm wondering if the treatment could affect hair loss if it comes into contact with the scalp.

I used to apply it to my scalp as well; could that have been the problem?

Or I'm confused if it's simply seasonal shedding, or if it's due to shampoo or some other cause.

I would like to know if it is correct to use the treatment only on the ends of the hair, and how best to use it to prevent hair loss.

I would appreciate advice from those who have had similar experiences.