Acupuncture Needles: Types, Sizes and How They Are Regulated

This page explains the device, not the technique. It gives no guidance on how needles are placed, how deep or at what angle, and acupuncture should never be self-administered.

What an acupuncture needle is

Under US federal regulation, an acupuncture needle is a device intended to pierce the skin in the practice of acupuncture, made of solid stainless steel and sometimes with a handle attached. [1] No drugs are injected through acupuncture needles. [2]

Types described in the literature

A 2025 review of devices describes conventional filiform needles (the thin, solid type most people picture), triangle-edged needles and thumbtack needles. [3] Thumbtack needles are a type of intradermal acupuncture using very short needles, reported as 0.3 to 2.5 mm, for stimulation at superficial points. [3] Ear methods can use small needles that stay in place for days. [4] See Auricular and Battlefield Acupuncture. Needles can also be connected to a stimulator, which is electroacupuncture. Other related tools, such as lasers, are separate: see Laser Acupuncture.

Sizes

There is no single "standard size". A systematic review of scar studies found reported diameters from 0.15 mm up to 0.30 mm and lengths from 5 mm up to 40 to 60 mm. [5] Those figures describe what trials reported in one area of research, not recommendations, and they say nothing about how a needle is used. Proper evidence not found on any single "right" size from a regulator or professional body I could read; sellers' product pages were not used as sources. Questions such as "how deep do acupuncture needles go" depend on the person, the area and the practitioner's training, and this site does not give depth or angle guidance.

How the FDA regulates them

In the United States, acupuncture needles are Class II devices with special controls. [1] The special controls are labeling for single use only, biocompatibility of the material and sterility. [1] NCCIH summarizes this as the FDA regulating needles as medical devices and requiring them to be sterile and labeled for single use only. [6] This is regulation of the product. It does not license practitioners, which happens at state level; see Licensing by US State. I did not read the rules of other countries for this page; see Regulation Outside the US.

Why single-use and sterile matter

NCCIH reports that complications have resulted from nonsterile needles and improper delivery of treatments. [6] Documented serious adverse events include infection, punctured organs and injury to the central nervous system. [6] A UK hospital trust lists broken needles as rare and infection as very rare because only sterile disposable needles are used. [2] More: Infection Risk and Clean Needle Technique and Serious Complications.

Buying needles or "pens" for home use

A product being legally sold as a device does not make self-use safe. Needle kits and pens for home use are discussed as a safety warning in At-Home Acupuncture Kits and Pens. If you want acupuncture, see a licensed practitioner: How to Choose an Acupuncturist.

What to ask a practitioner

• Are the needles sterile, single-use and opened in front of you?
• How are used needles disposed of?
• What training and license do you hold in this state or country?