Has anyone tried scalp mage to thicken hair? How long does it take to work? and how good is it?

I have extremely thin hair, so thin you can see the scalp. And I am not willing to cut it because i value its length. But I read recently that maging the scalp five to ten minutes a day will stimulate hair follicles and cause hair to regrow. How effective is this treatment and how long will it take for me to start noticing the effects? If anyone has advice from first hand experience, that would be great!