Do any "thickening" products actually work to prevent hair loss/thinning?

I’ve noticed my hair thinning and hairline receding since I was about 25 or so.

I’ve been using Collagen and Biotin “thickening” shampoo but never noticed any difference. My dad swears by some pills he started taking.

What’s Lemmy think? Is he just paying for pills that are placebo effect?