“When administering the Pfizer vaccine, the most important aspect is to give it in the muscle,” she said. “The upper arm is more easily accessible and has less fatty tissue covering the deltoid muscle, which is why it is most commonly administered there. The anterolateral thigh can absolutely be used as an alternative location. However, it is imperative to ensure that the vaccine is placed inside the muscle. Therefore, those receiving a vaccine in the thigh may need to use a longer needle (commonly 1.5 inch, as opposed to a 1 inch needle in the deltoid). This will obviously depend on your body type and weight.”