In some acupuncture points, needles inserted also deeply can puncture the lungs or gallbladder or lead to challenges with your blood vessels. That is why it is necessary to work with a practitioner that is perfectly-experienced in acupuncture. About 30 states have set up coaching specifications for certification in acupuncture, https://allhealthmarket.com/product/beauty/acupuncture/acupuncture-needles/500pcs-acupuncture-needle-with-tube-chinese-medicine-with-guide-tube-disposable-sterile-micro-needle/