Most adjustments are based on skin sensitivity, goals, and product type: Natural GHK levels decline with age, which is one reason older adults may be more interested in copper peptide routines
People with cognitive decline and dementia have less glutathione and more oxidised glutathione and an ever decreasing ability to recycle the spent/oxidised glutathione back to functional glutathione
Because glutathione synthesis depends on adequate cysteine availability, NAC supplementation has become one of the most widely researched strategies for supporting healthy glutathione levels
GHK-Cu quenches hydroxyl radicals much stronger than glutathione, demonstrated through ESR spectroscopy showing peroxyl radical scavenging
Further research is necessary to support its use
The GHK-Cu hair research overview covers this application area, and the peptides for hair growth research overview covers the broader hair peptide landscape