Ideal areas to inject into belly, upper arms, thighs and buttocks are parts of the body with a decent layer of fat. The body absorbs insulin at different speeds from each of the sites. The quickest area to be absorbed from is the belly, followed by the upper arm, then the thighs and lastly the buttocks.
Inject rapid-acting insulin into the abdomen right after a meal for the fastest results.
Inject long-acting and intermediate-acting insulin into the other sites, as rapid absorption would reduce the effectiveness of these types. Insulin works more efficiently over the entire time it needs to because of the slower absorption rate.
Exercise can increase the absorption rate of insulin. For example, a baseball pitcher should avoid injecting into their throwing arm. The physical activity can affect the absorption of insulin into the body. Wait for at least 45 minutes after the injection to exercise a part of the body that is near the injection site.
If you inject insulin regularly, need to rotate your injection site (move at least 1 inch from the last place given) of skin you inject insulin. To ensure your insulin gets absorbed consistently. Also, by rotating your injection sites, you can avoid developing stiffer, lumpy skin.
Avoid injecting around belly button, in skin that is scarred, or in skin that has visible blood vessels.