Acupuncture involves the insertion of extremely fine, hair-like, pre-sterilized, stainless steel needles at pre-determined points on the body surface (known as acupuncture points) to restore internal health. In the hands of a fully qualified professional practitioner the use of acupuncture is entirely safe and free of any harmful side-effects.
It has stood the test of time over several thousands of years and has not been found wanting.