No there are no thickening products that fix hair loss. Monoxadil and other similar products work but you can never stop using them or your hair will fall out again.
Minoxidil is produced in 5% concentration creams and foams, and that study is comparing rosemary oil to a 2% preparation. It's impressive that rosemary oil is comparable at all, but obviously if you're not taking a therapeutic dose of Monoxidil, it's not going to work properly.