Insulin syringes have varying needle length and are generally quite thin and virtually painless.

Insulin pens are considered faster and easier than syringes, and are convenient, provide accurate dosing, and use very thin disposable needles.

Insulin is delivered subcutaneously using a variety of injection sites, which may include the abdomen, sides (love handles), thighs, buttocks, and arms. It is suggested that a variety of spots should be used at each site. Pinching and cleansing is not generally necessary. A few seconds should be allowed for full delivery.