To improve uneven or dull skin tone, it is recommended to combine with AHA (alpha hydroxy acids) for mild exfoliation, promoting skin metabolism and making the skin brighter
2016 Jul-Aug;26(4):225-7
Cost and Availability L-Glutathione : Generally more affordable and widely available in various forms, but the efficacy can vary significantly between products
Some side effects include: Before beginning treatment, always consult a qualified dermatologist
Published evidence is narrower: topical skin and wound studies exist, hair claims are more indirect, and FDA materials caution that injectable GHK-Cu has limited human safety data [2], [3], [8]
If you experience persistent side effects that don't go away after a few days of use, it is always a good idea to listen to your body