Some say it works like a steroid. Others say it has large amounts of sulfur for nutrition. Others say it stimulates circulation.
I use red onions.
I've noticed some minor improvements. Small hairs getting thicker and darker. Hair line moving back down with new hairs popping out. Hair growing faster.
Works best for those just starting to have a problem with hair fall. Before too much damage has been done.
Even in my case it seems that their is a chance it might eventually grow all back. but so far it still isn't thick enough for me to grow it out.