As reported by Glossy, NAD has had a meteoric rise in popularity over the past year, including IV drips and shots offered in wellness clinics and doctor offices, as well as ancillary at-home products, like precursor supplements (called NAD+), nasal spray, transdermal patches and skin care
Depending on the filler used, results can last anywhere from a few months to a year
doi:10.1007/s12011-019-01954-6
Its best to discuss the right schedule with your provider
Human data remain limited, and most studies are small, single-center, or use copper peptide formulations combined with other ingredients (which makes it hard to isolate GHK-Cu's specific contribution): A 2016 Lee et al
Int J Mol Sci 25(6):3268 Piscopo M, Tenore GC, Notariale R, Maresca V, Maisto M, de Ruberto F et al (2020) Antimicrobial and antioxidant activity of proteins from Feijoa sellowiana Berg