Kybella does not do much if anything to tighten the neck muscles. Many patients have banding or laxity of the platysma muscle in the neck, and this is generally only improved with a surgical neck lift. There are many non-surgical options out there (ultrasound, radiofrequency, etc) that promise to improve muscle laxity, but patients generally see very little if any results from these. If patients are concerned with neck laxity and aren't sure if Kybella or another treatment is right for them, a consultation with a facial plastic surgeon may be helpful to review all of the possible surgical and non-surgical treatment options in detail.All the best,