I have a question about hair loss treatments!

Hello! My hair has been thinning little by little for a while, but recently it has thinned out even more and become very fine, which is causing me a lot of worry. Everyone strongly recommends hair loss treatments. So, I am planning to start managing it seriously, but I am confused about which one to choose because there are so many types available!

I've seen a wide variety of hair loss treatments, but I'm wondering which one would produce the most noticeable results for my condition. Is there anything that is cost-effective and offers definite results?

If I decide to get hair loss treatment, how many sessions or weeks of treatment would I typically need to see noticeable effects, such as thickening my hair or new growth? I don't necessarily need thick hair, but I want to at least prevent it from looking sparse!

And lastly, I would appreciate it if you could share any side effects or precautions I should take after the procedure! Have a great day!