Yes, many nutraceutical manufacturers can make custom formulations
Proposed mechanism of GHK: reversal of senescence in lung fibroblasts and activation of integrin (ITG)-1 to resolve persistent fibrosis
Cheng Q, Zou X, Wang Y, Yang Z, Qiu X, Wang S, Yang Y, Yang D, Kim HS, Jia X, Li L, Kwak S-S, Wang W (2024) Overexpression of dehydroascorbate reductase gene IbDHAR1 improves the tolerance to abiotic stress in sweet potato
The protocol is expensive and the time investment is real
Most people require multiple sessions to achieve visible results, and maintenance sessions may be needed to sustain the whitening effect