it will surely work and help increase hair growth towards your regime. But make sure you do scalp massage on a daily basis. You can’t just push blood that way, if the vessels have blockages, it will still be limited in results.
i don’t have an inversion board but i just lay upside down on the sofa (hard to describe) for 5-10 minutes. and that helps a lot, sometimes i massage the scalp whilst doing it, feels great and helped my hair a lot.
Meditation will help calm the nerves and re-wires the brain to stay calmer in various situations. These days we have a lot of nerve problems with people, and just nerve issue alone is enough to cause serious hair loss, which often is referred to as stress related hair loss (but it actually is the nerve). hope this helps @MrCake
I take niacin for taking the blood to the extremities. I think perhaps doing an inversion and niacin together might improve the results on top of it. but i agree with what others have said, that it should be more a regime than just 1 thing at a time.