The needles used are single-use, sterile, and disposable
The results of two independent surveys published in the British Medical Journal in 2001 (MacPherson et al, White et al, both BMJ September 2001) concluded that the risk of serious adverse reaction to acupuncture is less than 1 in 10,000. 
Responses to treatment can sometimes include tiredness or mild dizziness, and very occasionally minor bruising may occur. However, all such reactions are short-lived.
