What Needle Size for Insulin?

Traditionally, needles used in insulin therapy were 12.7 millimeters (mm) in length. Recent research shows that smaller 8 mm, 6 mm, and 4 mm needles are just as effective, regardless of body mass. This means insulin injection is less painful than it was in the past.

What size of needle and syringe is used for insulin?

In most cases, it may be advisable for people to use needles ranging from 4–8 mm in length. People may also prefer thinner needles, as they are typically easier to use than thicker needles. A 2015 study notes that thinner needles are usually less painful and easier to insert.

Does needle size affect insulin?

Studies have found short, thin needles deliver insulin as effectively as longer, thicker ones and may be more comfortable to use.