You don't have to constantly inject yourself with anything, and that alone is a major point of distinction between a GHK-Cu injection vs topical
(PubMed) Kumaraswamy E, Malykh A, Korotkov KV, et al
Exp Hematol 95:1322 Tang D, Kang R, Berghe TV, Vandenabeele P, Kroemer G (2019) The molecular machinery of regulated cell death
Cancer Cell 7(3):211217 Mantovani A, Sica A (2010) Macrophages, innate immunity and cancer: balance, tolerance, and diversity
Glutathione composed of 40% reduced glutathione and 60% high quality phospholipids (mainly phosphatidylcholine), small lyposome (130 nanometers on average) as a guarantee of effectiveness
Very fine, blonde, gray, white, or red chin hairs may not have enough melanin for the laser to target effectively, so results may be more limited