Hair Regrowth Serum? Anyone here tried?

Hello

I have been looking around to look for hair growth serums that actually work. I have read many forums, blogs and websites but many seem to be just scam. However, I am very much interested in the story posted by this guy. His progress seems to be legit:
https://www.tellmebest.com/hairloss-recovery/

I am thinking of giving this serum a try. Anybody here used serums in the past that worked for you