Needles don’t do anything.
It is the CHI that does the healing . The Heat.
Needles are just tools used in opening up channels that are blocked…Called Circulation.
They aren’t even necessary.
You could do the same thing with your hand, by just striking the area until it turns red.
(Called Acupressure)
Or… perform some series of medical exercises designed to tear down certain blockages.
Say if your arm was in a cast for eight weeks.
Or in an extreme case your feet were bound as a child because people thought that they “looked cute” or something…
Your feet are then shaped like hooves or duck feet or something…
Then you can use needle to tear open your skin and let it heal after every treatment until your feet are in the anatomically correct proper position for flow of chi.
Your DNA genetically knows and will maintain it after treatment for life.
The effect will be permanent. This is called a Cure.
You do not have to do anything.
It is the same thing you do to your Niacin (Vitamin-B) herbs. Which will be not be fully cured when you get them.
In this case Vitamin B is like the Chi.