Hi . On top of the excellent information from Christine, I want to ask if anyone has mentioned the "Citrate-free" form of Humira or the biosimilars? Do you know if the form you are taking has the citrate or not? I ask this because the original form of Humira contains citrate, as do some of the biosimilars, as a buffer/preservative. A lot of people experience painful injections with this form, so the manufacturer developed a citrate-free version, which uses a different buffer, that is supposed to be less painful. Your doctor should be able to answer questions on whether your drug has the citrate and whether it would be possible to get the citrate-free form. Hope this information helps. Best, Richard (Team Member)